Merge git://git.kernel.org/pub/scm/virt/kvm/kvm

[mirror_ubuntu-artful-kernel.git] / arch / x86 / kvm / svm.c

/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * AMD SVM support
 *
 * Copyright (C) 2006 Qumranet, Inc.
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * Authors:
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *   Avi Kivity   <avi@qumranet.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */
#include <linux/kvm_host.h>

#include "irq.h"
#include "mmu.h"
#include "kvm_cache_regs.h"
#include "x86.h"
#include "cpuid.h"

#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/ftrace_event.h>
#include <linux/slab.h>

#include <asm/perf_event.h>
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/debugreg.h>
#include <asm/kvm_para.h>

#include <asm/virtext.h>
#include "trace.h"

#define __ex(x) __kvm_handle_fault_on_reboot(x)

MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");

static const struct x86_cpu_id svm_cpu_id[] = {
        X86_FEATURE_MATCH(X86_FEATURE_SVM),
        {}
};
MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);

#define IOPM_ALLOC_ORDER 2
#define MSRPM_ALLOC_ORDER 1

#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3

#define SVM_FEATURE_NPT            (1 <<  0)
#define SVM_FEATURE_LBRV           (1 <<  1)
#define SVM_FEATURE_SVML           (1 <<  2)
#define SVM_FEATURE_NRIP           (1 <<  3)
#define SVM_FEATURE_TSC_RATE       (1 <<  4)
#define SVM_FEATURE_VMCB_CLEAN     (1 <<  5)
#define SVM_FEATURE_FLUSH_ASID     (1 <<  6)
#define SVM_FEATURE_DECODE_ASSIST  (1 <<  7)
#define SVM_FEATURE_PAUSE_FILTER   (1 << 10)

#define NESTED_EXIT_HOST        0       /* Exit handled on host level */
#define NESTED_EXIT_DONE        1       /* Exit caused nested vmexit  */
#define NESTED_EXIT_CONTINUE    2       /* Further checks needed      */

#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))

#define TSC_RATIO_RSVD          0xffffff0000000000ULL
#define TSC_RATIO_MIN           0x0000000000000001ULL
#define TSC_RATIO_MAX           0x000000ffffffffffULL

static bool erratum_383_found __read_mostly;

static const u32 host_save_user_msrs[] = {
#ifdef CONFIG_X86_64
        MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
        MSR_FS_BASE,
#endif
        MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
};

#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)

struct kvm_vcpu;

struct nested_state {
        struct vmcb *hsave;
        u64 hsave_msr;
        u64 vm_cr_msr;
        u64 vmcb;

        /* These are the merged vectors */
        u32 *msrpm;

        /* gpa pointers to the real vectors */
        u64 vmcb_msrpm;
        u64 vmcb_iopm;

        /* A VMEXIT is required but not yet emulated */
        bool exit_required;

        /* cache for intercepts of the guest */
        u32 intercept_cr;
        u32 intercept_dr;
        u32 intercept_exceptions;
        u64 intercept;

        /* Nested Paging related state */
        u64 nested_cr3;
};

#define MSRPM_OFFSETS   16
static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;

/*
 * Set osvw_len to higher value when updated Revision Guides
 * are published and we know what the new status bits are
 */
static uint64_t osvw_len = 4, osvw_status;

struct vcpu_svm {
        struct kvm_vcpu vcpu;
        struct vmcb *vmcb;
        unsigned long vmcb_pa;
        struct svm_cpu_data *svm_data;
        uint64_t asid_generation;
        uint64_t sysenter_esp;
        uint64_t sysenter_eip;

        u64 next_rip;

        u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
        struct {
                u16 fs;
                u16 gs;
                u16 ldt;
                u64 gs_base;
        } host;

        u32 *msrpm;

        ulong nmi_iret_rip;

        struct nested_state nested;

        bool nmi_singlestep;

        unsigned int3_injected;
        unsigned long int3_rip;
        u32 apf_reason;

        u64  tsc_ratio;
};

static DEFINE_PER_CPU(u64, current_tsc_ratio);
#define TSC_RATIO_DEFAULT       0x0100000000ULL

#define MSR_INVALID                     0xffffffffU

static const struct svm_direct_access_msrs {
        u32 index;   /* Index of the MSR */
        bool always; /* True if intercept is always on */
} direct_access_msrs[] = {
        { .index = MSR_STAR,                            .always = true  },
        { .index = MSR_IA32_SYSENTER_CS,                .always = true  },
#ifdef CONFIG_X86_64
        { .index = MSR_GS_BASE,                         .always = true  },
        { .index = MSR_FS_BASE,                         .always = true  },
        { .index = MSR_KERNEL_GS_BASE,                  .always = true  },
        { .index = MSR_LSTAR,                           .always = true  },
        { .index = MSR_CSTAR,                           .always = true  },
        { .index = MSR_SYSCALL_MASK,                    .always = true  },
#endif
        { .index = MSR_IA32_LASTBRANCHFROMIP,           .always = false },
        { .index = MSR_IA32_LASTBRANCHTOIP,             .always = false },
        { .index = MSR_IA32_LASTINTFROMIP,              .always = false },
        { .index = MSR_IA32_LASTINTTOIP,                .always = false },
        { .index = MSR_INVALID,                         .always = false },
};

/* enable NPT for AMD64 and X86 with PAE */
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
static bool npt_enabled = true;
#else
static bool npt_enabled;
#endif

/* allow nested paging (virtualized MMU) for all guests */
static int npt = true;
module_param(npt, int, S_IRUGO);

/* allow nested virtualization in KVM/SVM */
static int nested = true;
module_param(nested, int, S_IRUGO);

static void svm_flush_tlb(struct kvm_vcpu *vcpu);
static void svm_complete_interrupts(struct vcpu_svm *svm);

static int nested_svm_exit_handled(struct vcpu_svm *svm);
static int nested_svm_intercept(struct vcpu_svm *svm);
static int nested_svm_vmexit(struct vcpu_svm *svm);
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
                                      bool has_error_code, u32 error_code);
static u64 __scale_tsc(u64 ratio, u64 tsc);

enum {
        VMCB_INTERCEPTS, /* Intercept vectors, TSC offset,
                            pause filter count */
        VMCB_PERM_MAP,   /* IOPM Base and MSRPM Base */
        VMCB_ASID,       /* ASID */
        VMCB_INTR,       /* int_ctl, int_vector */
        VMCB_NPT,        /* npt_en, nCR3, gPAT */
        VMCB_CR,         /* CR0, CR3, CR4, EFER */
        VMCB_DR,         /* DR6, DR7 */
        VMCB_DT,         /* GDT, IDT */
        VMCB_SEG,        /* CS, DS, SS, ES, CPL */
        VMCB_CR2,        /* CR2 only */
        VMCB_LBR,        /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
        VMCB_DIRTY_MAX,
};

/* TPR and CR2 are always written before VMRUN */
#define VMCB_ALWAYS_DIRTY_MASK  ((1U << VMCB_INTR) | (1U << VMCB_CR2))

static inline void mark_all_dirty(struct vmcb *vmcb)
{
        vmcb->control.clean = 0;
}

static inline void mark_all_clean(struct vmcb *vmcb)
{
        vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1)
                               & ~VMCB_ALWAYS_DIRTY_MASK;
}

static inline void mark_dirty(struct vmcb *vmcb, int bit)
{
        vmcb->control.clean &= ~(1 << bit);
}

static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
{
        return container_of(vcpu, struct vcpu_svm, vcpu);
}

static void recalc_intercepts(struct vcpu_svm *svm)
{
        struct vmcb_control_area *c, *h;
        struct nested_state *g;

        mark_dirty(svm->vmcb, VMCB_INTERCEPTS);

        if (!is_guest_mode(&svm->vcpu))
                return;

        c = &svm->vmcb->control;
        h = &svm->nested.hsave->control;
        g = &svm->nested;

        c->intercept_cr = h->intercept_cr | g->intercept_cr;
        c->intercept_dr = h->intercept_dr | g->intercept_dr;
        c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions;
        c->intercept = h->intercept | g->intercept;
}

static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
{
        if (is_guest_mode(&svm->vcpu))
                return svm->nested.hsave;
        else
                return svm->vmcb;
}

static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_cr |= (1U << bit);

        recalc_intercepts(svm);
}

static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_cr &= ~(1U << bit);

        recalc_intercepts(svm);
}

static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        return vmcb->control.intercept_cr & (1U << bit);
}

static inline void set_dr_intercepts(struct vcpu_svm *svm)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
                | (1 << INTERCEPT_DR1_READ)
                | (1 << INTERCEPT_DR2_READ)
                | (1 << INTERCEPT_DR3_READ)
                | (1 << INTERCEPT_DR4_READ)
                | (1 << INTERCEPT_DR5_READ)
                | (1 << INTERCEPT_DR6_READ)
                | (1 << INTERCEPT_DR7_READ)
                | (1 << INTERCEPT_DR0_WRITE)
                | (1 << INTERCEPT_DR1_WRITE)
                | (1 << INTERCEPT_DR2_WRITE)
                | (1 << INTERCEPT_DR3_WRITE)
                | (1 << INTERCEPT_DR4_WRITE)
                | (1 << INTERCEPT_DR5_WRITE)
                | (1 << INTERCEPT_DR6_WRITE)
                | (1 << INTERCEPT_DR7_WRITE);

        recalc_intercepts(svm);
}

static inline void clr_dr_intercepts(struct vcpu_svm *svm)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_dr = 0;

        recalc_intercepts(svm);
}

static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_exceptions |= (1U << bit);

        recalc_intercepts(svm);
}

static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept_exceptions &= ~(1U << bit);

        recalc_intercepts(svm);
}

static inline void set_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept |= (1ULL << bit);

        recalc_intercepts(svm);
}

static inline void clr_intercept(struct vcpu_svm *svm, int bit)
{
        struct vmcb *vmcb = get_host_vmcb(svm);

        vmcb->control.intercept &= ~(1ULL << bit);

        recalc_intercepts(svm);
}

static inline void enable_gif(struct vcpu_svm *svm)
{
        svm->vcpu.arch.hflags |= HF_GIF_MASK;
}

static inline void disable_gif(struct vcpu_svm *svm)
{
        svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
}

static inline bool gif_set(struct vcpu_svm *svm)
{
        return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
}

static unsigned long iopm_base;

struct kvm_ldttss_desc {
        u16 limit0;
        u16 base0;
        unsigned base1:8, type:5, dpl:2, p:1;
        unsigned limit1:4, zero0:3, g:1, base2:8;
        u32 base3;
        u32 zero1;
} __attribute__((packed));

struct svm_cpu_data {
        int cpu;

        u64 asid_generation;
        u32 max_asid;
        u32 next_asid;
        struct kvm_ldttss_desc *tss_desc;

        struct page *save_area;
};

static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);

struct svm_init_data {
        int cpu;
        int r;
};

static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};

#define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
#define MSRS_RANGE_SIZE 2048
#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)

static u32 svm_msrpm_offset(u32 msr)
{
        u32 offset;
        int i;

        for (i = 0; i < NUM_MSR_MAPS; i++) {
                if (msr < msrpm_ranges[i] ||
                    msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
                        continue;

                offset  = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
                offset += (i * MSRS_RANGE_SIZE);       /* add range offset */

                /* Now we have the u8 offset - but need the u32 offset */
                return offset / 4;
        }

        /* MSR not in any range */
        return MSR_INVALID;
}

#define MAX_INST_SIZE 15

static inline void clgi(void)
{
        asm volatile (__ex(SVM_CLGI));
}

static inline void stgi(void)
{
        asm volatile (__ex(SVM_STGI));
}

static inline void invlpga(unsigned long addr, u32 asid)
{
        asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
}

static int get_npt_level(void)
{
#ifdef CONFIG_X86_64
        return PT64_ROOT_LEVEL;
#else
        return PT32E_ROOT_LEVEL;
#endif
}

static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
        vcpu->arch.efer = efer;
        if (!npt_enabled && !(efer & EFER_LMA))
                efer &= ~EFER_LME;

        to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
        mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
}

static int is_external_interrupt(u32 info)
{
        info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
        return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
}

static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u32 ret = 0;

        if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
                ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
        return ret;
}

static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (mask == 0)
                svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
        else
                svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;

}

static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (svm->vmcb->control.next_rip != 0)
                svm->next_rip = svm->vmcb->control.next_rip;

        if (!svm->next_rip) {
                if (emulate_instruction(vcpu, EMULTYPE_SKIP) !=
                                EMULATE_DONE)
                        printk(KERN_DEBUG "%s: NOP\n", __func__);
                return;
        }
        if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
                printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
                       __func__, kvm_rip_read(vcpu), svm->next_rip);

        kvm_rip_write(vcpu, svm->next_rip);
        svm_set_interrupt_shadow(vcpu, 0);
}

static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
                                bool has_error_code, u32 error_code,
                                bool reinject)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        /*
         * If we are within a nested VM we'd better #VMEXIT and let the guest
         * handle the exception
         */
        if (!reinject &&
            nested_svm_check_exception(svm, nr, has_error_code, error_code))
                return;

        if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) {
                unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);

                /*
                 * For guest debugging where we have to reinject #BP if some
                 * INT3 is guest-owned:
                 * Emulate nRIP by moving RIP forward. Will fail if injection
                 * raises a fault that is not intercepted. Still better than
                 * failing in all cases.
                 */
                skip_emulated_instruction(&svm->vcpu);
                rip = kvm_rip_read(&svm->vcpu);
                svm->int3_rip = rip + svm->vmcb->save.cs.base;
                svm->int3_injected = rip - old_rip;
        }

        svm->vmcb->control.event_inj = nr
                | SVM_EVTINJ_VALID
                | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
                | SVM_EVTINJ_TYPE_EXEPT;
        svm->vmcb->control.event_inj_err = error_code;
}

static void svm_init_erratum_383(void)
{
        u32 low, high;
        int err;
        u64 val;

        if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
                return;

        /* Use _safe variants to not break nested virtualization */
        val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
        if (err)
                return;

        val |= (1ULL << 47);

        low  = lower_32_bits(val);
        high = upper_32_bits(val);

        native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);

        erratum_383_found = true;
}

static void svm_init_osvw(struct kvm_vcpu *vcpu)
{
        /*
         * Guests should see errata 400 and 415 as fixed (assuming that
         * HLT and IO instructions are intercepted).
         */
        vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
        vcpu->arch.osvw.status = osvw_status & ~(6ULL);

        /*
         * By increasing VCPU's osvw.length to 3 we are telling the guest that
         * all osvw.status bits inside that length, including bit 0 (which is
         * reserved for erratum 298), are valid. However, if host processor's
         * osvw_len is 0 then osvw_status[0] carries no information. We need to
         * be conservative here and therefore we tell the guest that erratum 298
         * is present (because we really don't know).
         */
        if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
                vcpu->arch.osvw.status |= 1;
}

static int has_svm(void)
{
        const char *msg;

        if (!cpu_has_svm(&msg)) {
                printk(KERN_INFO "has_svm: %s\n", msg);
                return 0;
        }

        return 1;
}

static void svm_hardware_disable(void)
{
        /* Make sure we clean up behind us */
        if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
                wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);

        cpu_svm_disable();

        amd_pmu_disable_virt();
}

static int svm_hardware_enable(void)
{

        struct svm_cpu_data *sd;
        uint64_t efer;
        struct desc_ptr gdt_descr;
        struct desc_struct *gdt;
        int me = raw_smp_processor_id();

        rdmsrl(MSR_EFER, efer);
        if (efer & EFER_SVME)
                return -EBUSY;

        if (!has_svm()) {
                pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
                return -EINVAL;
        }
        sd = per_cpu(svm_data, me);
        if (!sd) {
                pr_err("%s: svm_data is NULL on %d\n", __func__, me);
                return -EINVAL;
        }

        sd->asid_generation = 1;
        sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
        sd->next_asid = sd->max_asid + 1;

        native_store_gdt(&gdt_descr);
        gdt = (struct desc_struct *)gdt_descr.address;
        sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);

        wrmsrl(MSR_EFER, efer | EFER_SVME);

        wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);

        if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
                wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
                __this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
        }


        /*
         * Get OSVW bits.
         *
         * Note that it is possible to have a system with mixed processor
         * revisions and therefore different OSVW bits. If bits are not the same
         * on different processors then choose the worst case (i.e. if erratum
         * is present on one processor and not on another then assume that the
         * erratum is present everywhere).
         */
        if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) {
                uint64_t len, status = 0;
                int err;

                len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err);
                if (!err)
                        status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS,
                                                      &err);

                if (err)
                        osvw_status = osvw_len = 0;
                else {
                        if (len < osvw_len)
                                osvw_len = len;
                        osvw_status |= status;
                        osvw_status &= (1ULL << osvw_len) - 1;
                }
        } else
                osvw_status = osvw_len = 0;

        svm_init_erratum_383();

        amd_pmu_enable_virt();

        return 0;
}

static void svm_cpu_uninit(int cpu)
{
        struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());

        if (!sd)
                return;

        per_cpu(svm_data, raw_smp_processor_id()) = NULL;
        __free_page(sd->save_area);
        kfree(sd);
}

static int svm_cpu_init(int cpu)
{
        struct svm_cpu_data *sd;
        int r;

        sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
        if (!sd)
                return -ENOMEM;
        sd->cpu = cpu;
        sd->save_area = alloc_page(GFP_KERNEL);
        r = -ENOMEM;
        if (!sd->save_area)
                goto err_1;

        per_cpu(svm_data, cpu) = sd;

        return 0;

err_1:
        kfree(sd);
        return r;

}

static bool valid_msr_intercept(u32 index)
{
        int i;

        for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
                if (direct_access_msrs[i].index == index)
                        return true;

        return false;
}

static void set_msr_interception(u32 *msrpm, unsigned msr,
                                 int read, int write)
{
        u8 bit_read, bit_write;
        unsigned long tmp;
        u32 offset;

        /*
         * If this warning triggers extend the direct_access_msrs list at the
         * beginning of the file
         */
        WARN_ON(!valid_msr_intercept(msr));

        offset    = svm_msrpm_offset(msr);
        bit_read  = 2 * (msr & 0x0f);
        bit_write = 2 * (msr & 0x0f) + 1;
        tmp       = msrpm[offset];

        BUG_ON(offset == MSR_INVALID);

        read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);
        write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);

        msrpm[offset] = tmp;
}

static void svm_vcpu_init_msrpm(u32 *msrpm)
{
        int i;

        memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));

        for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
                if (!direct_access_msrs[i].always)
                        continue;

                set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
        }
}

static void add_msr_offset(u32 offset)
{
        int i;

        for (i = 0; i < MSRPM_OFFSETS; ++i) {

                /* Offset already in list? */
                if (msrpm_offsets[i] == offset)
                        return;

                /* Slot used by another offset? */
                if (msrpm_offsets[i] != MSR_INVALID)
                        continue;

                /* Add offset to list */
                msrpm_offsets[i] = offset;

                return;
        }

        /*
         * If this BUG triggers the msrpm_offsets table has an overflow. Just
         * increase MSRPM_OFFSETS in this case.
         */
        BUG();
}

static void init_msrpm_offsets(void)
{
        int i;

        memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));

        for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
                u32 offset;

                offset = svm_msrpm_offset(direct_access_msrs[i].index);
                BUG_ON(offset == MSR_INVALID);

                add_msr_offset(offset);
        }
}

static void svm_enable_lbrv(struct vcpu_svm *svm)
{
        u32 *msrpm = svm->msrpm;

        svm->vmcb->control.lbr_ctl = 1;
        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
        set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
        set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
}

static void svm_disable_lbrv(struct vcpu_svm *svm)
{
        u32 *msrpm = svm->msrpm;

        svm->vmcb->control.lbr_ctl = 0;
        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
        set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
        set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
}

static __init int svm_hardware_setup(void)
{
        int cpu;
        struct page *iopm_pages;
        void *iopm_va;
        int r;

        iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);

        if (!iopm_pages)
                return -ENOMEM;

        iopm_va = page_address(iopm_pages);
        memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
        iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;

        init_msrpm_offsets();

        if (boot_cpu_has(X86_FEATURE_NX))
                kvm_enable_efer_bits(EFER_NX);

        if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
                kvm_enable_efer_bits(EFER_FFXSR);

        if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
                u64 max;

                kvm_has_tsc_control = true;

                /*
                 * Make sure the user can only configure tsc_khz values that
                 * fit into a signed integer.
                 * A min value is not calculated needed because it will always
                 * be 1 on all machines and a value of 0 is used to disable
                 * tsc-scaling for the vcpu.
                 */
                max = min(0x7fffffffULL, __scale_tsc(tsc_khz, TSC_RATIO_MAX));

                kvm_max_guest_tsc_khz = max;
        }

        if (nested) {
                printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
                kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
        }

        for_each_possible_cpu(cpu) {
                r = svm_cpu_init(cpu);
                if (r)
                        goto err;
        }

        if (!boot_cpu_has(X86_FEATURE_NPT))
                npt_enabled = false;

        if (npt_enabled && !npt) {
                printk(KERN_INFO "kvm: Nested Paging disabled\n");
                npt_enabled = false;
        }

        if (npt_enabled) {
                printk(KERN_INFO "kvm: Nested Paging enabled\n");
                kvm_enable_tdp();
        } else
                kvm_disable_tdp();

        return 0;

err:
        __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
        iopm_base = 0;
        return r;
}

static __exit void svm_hardware_unsetup(void)
{
        int cpu;

        for_each_possible_cpu(cpu)
                svm_cpu_uninit(cpu);

        __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
        iopm_base = 0;
}

static void init_seg(struct vmcb_seg *seg)
{
        seg->selector = 0;
        seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
                      SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
        seg->limit = 0xffff;
        seg->base = 0;
}

static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
{
        seg->selector = 0;
        seg->attrib = SVM_SELECTOR_P_MASK | type;
        seg->limit = 0xffff;
        seg->base = 0;
}

static u64 __scale_tsc(u64 ratio, u64 tsc)
{
        u64 mult, frac, _tsc;

        mult  = ratio >> 32;
        frac  = ratio & ((1ULL << 32) - 1);

        _tsc  = tsc;
        _tsc *= mult;
        _tsc += (tsc >> 32) * frac;
        _tsc += ((tsc & ((1ULL << 32) - 1)) * frac) >> 32;

        return _tsc;
}

static u64 svm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u64 _tsc = tsc;

        if (svm->tsc_ratio != TSC_RATIO_DEFAULT)
                _tsc = __scale_tsc(svm->tsc_ratio, tsc);

        return _tsc;
}

static void svm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u64 ratio;
        u64 khz;

        /* Guest TSC same frequency as host TSC? */
        if (!scale) {
                svm->tsc_ratio = TSC_RATIO_DEFAULT;
                return;
        }

        /* TSC scaling supported? */
        if (!boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
                if (user_tsc_khz > tsc_khz) {
                        vcpu->arch.tsc_catchup = 1;
                        vcpu->arch.tsc_always_catchup = 1;
                } else
                        WARN(1, "user requested TSC rate below hardware speed\n");
                return;
        }

        khz = user_tsc_khz;

        /* TSC scaling required  - calculate ratio */
        ratio = khz << 32;
        do_div(ratio, tsc_khz);

        if (ratio == 0 || ratio & TSC_RATIO_RSVD) {
                WARN_ONCE(1, "Invalid TSC ratio - virtual-tsc-khz=%u\n",
                                user_tsc_khz);
                return;
        }
        svm->tsc_ratio             = ratio;
}

static u64 svm_read_tsc_offset(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        return svm->vmcb->control.tsc_offset;
}

static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u64 g_tsc_offset = 0;

        if (is_guest_mode(vcpu)) {
                g_tsc_offset = svm->vmcb->control.tsc_offset -
                               svm->nested.hsave->control.tsc_offset;
                svm->nested.hsave->control.tsc_offset = offset;
        } else
                trace_kvm_write_tsc_offset(vcpu->vcpu_id,
                                           svm->vmcb->control.tsc_offset,
                                           offset);

        svm->vmcb->control.tsc_offset = offset + g_tsc_offset;

        mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
}

static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (host) {
                if (svm->tsc_ratio != TSC_RATIO_DEFAULT)
                        WARN_ON(adjustment < 0);
                adjustment = svm_scale_tsc(vcpu, (u64)adjustment);
        }

        svm->vmcb->control.tsc_offset += adjustment;
        if (is_guest_mode(vcpu))
                svm->nested.hsave->control.tsc_offset += adjustment;
        else
                trace_kvm_write_tsc_offset(vcpu->vcpu_id,
                                     svm->vmcb->control.tsc_offset - adjustment,
                                     svm->vmcb->control.tsc_offset);

        mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
}

static u64 svm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
{
        u64 tsc;

        tsc = svm_scale_tsc(vcpu, native_read_tsc());

        return target_tsc - tsc;
}

static void init_vmcb(struct vcpu_svm *svm)
{
        struct vmcb_control_area *control = &svm->vmcb->control;
        struct vmcb_save_area *save = &svm->vmcb->save;

        svm->vcpu.fpu_active = 1;
        svm->vcpu.arch.hflags = 0;

        set_cr_intercept(svm, INTERCEPT_CR0_READ);
        set_cr_intercept(svm, INTERCEPT_CR3_READ);
        set_cr_intercept(svm, INTERCEPT_CR4_READ);
        set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
        set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
        set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
        set_cr_intercept(svm, INTERCEPT_CR8_WRITE);

        set_dr_intercepts(svm);

        set_exception_intercept(svm, PF_VECTOR);
        set_exception_intercept(svm, UD_VECTOR);
        set_exception_intercept(svm, MC_VECTOR);

        set_intercept(svm, INTERCEPT_INTR);
        set_intercept(svm, INTERCEPT_NMI);
        set_intercept(svm, INTERCEPT_SMI);
        set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
        set_intercept(svm, INTERCEPT_RDPMC);
        set_intercept(svm, INTERCEPT_CPUID);
        set_intercept(svm, INTERCEPT_INVD);
        set_intercept(svm, INTERCEPT_HLT);
        set_intercept(svm, INTERCEPT_INVLPG);
        set_intercept(svm, INTERCEPT_INVLPGA);
        set_intercept(svm, INTERCEPT_IOIO_PROT);
        set_intercept(svm, INTERCEPT_MSR_PROT);
        set_intercept(svm, INTERCEPT_TASK_SWITCH);
        set_intercept(svm, INTERCEPT_SHUTDOWN);
        set_intercept(svm, INTERCEPT_VMRUN);
        set_intercept(svm, INTERCEPT_VMMCALL);
        set_intercept(svm, INTERCEPT_VMLOAD);
        set_intercept(svm, INTERCEPT_VMSAVE);
        set_intercept(svm, INTERCEPT_STGI);
        set_intercept(svm, INTERCEPT_CLGI);
        set_intercept(svm, INTERCEPT_SKINIT);
        set_intercept(svm, INTERCEPT_WBINVD);
        set_intercept(svm, INTERCEPT_MONITOR);
        set_intercept(svm, INTERCEPT_MWAIT);
        set_intercept(svm, INTERCEPT_XSETBV);

        control->iopm_base_pa = iopm_base;
        control->msrpm_base_pa = __pa(svm->msrpm);
        control->int_ctl = V_INTR_MASKING_MASK;

        init_seg(&save->es);
        init_seg(&save->ss);
        init_seg(&save->ds);
        init_seg(&save->fs);
        init_seg(&save->gs);

        save->cs.selector = 0xf000;
        save->cs.base = 0xffff0000;
        /* Executable/Readable Code Segment */
        save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
                SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
        save->cs.limit = 0xffff;

        save->gdtr.limit = 0xffff;
        save->idtr.limit = 0xffff;

        init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
        init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);

        svm_set_efer(&svm->vcpu, 0);
        save->dr6 = 0xffff0ff0;
        kvm_set_rflags(&svm->vcpu, 2);
        save->rip = 0x0000fff0;
        svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;

        /*
         * This is the guest-visible cr0 value.
         * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
         */
        svm->vcpu.arch.cr0 = 0;
        (void)kvm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);

        save->cr4 = X86_CR4_PAE;
        /* rdx = ?? */

        if (npt_enabled) {
                /* Setup VMCB for Nested Paging */
                control->nested_ctl = 1;
                clr_intercept(svm, INTERCEPT_INVLPG);
                clr_exception_intercept(svm, PF_VECTOR);
                clr_cr_intercept(svm, INTERCEPT_CR3_READ);
                clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
                save->g_pat = 0x0007040600070406ULL;
                save->cr3 = 0;
                save->cr4 = 0;
        }
        svm->asid_generation = 0;

        svm->nested.vmcb = 0;
        svm->vcpu.arch.hflags = 0;

        if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
                control->pause_filter_count = 3000;
                set_intercept(svm, INTERCEPT_PAUSE);
        }

        mark_all_dirty(svm->vmcb);

        enable_gif(svm);
}

static void svm_vcpu_reset(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u32 dummy;
        u32 eax = 1;

        init_vmcb(svm);

        kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy);
        kvm_register_write(vcpu, VCPU_REGS_RDX, eax);
}

static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
{
        struct vcpu_svm *svm;
        struct page *page;
        struct page *msrpm_pages;
        struct page *hsave_page;
        struct page *nested_msrpm_pages;
        int err;

        svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
        if (!svm) {
                err = -ENOMEM;
                goto out;
        }

        svm->tsc_ratio = TSC_RATIO_DEFAULT;

        err = kvm_vcpu_init(&svm->vcpu, kvm, id);
        if (err)
                goto free_svm;

        err = -ENOMEM;
        page = alloc_page(GFP_KERNEL);
        if (!page)
                goto uninit;

        msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
        if (!msrpm_pages)
                goto free_page1;

        nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
        if (!nested_msrpm_pages)
                goto free_page2;

        hsave_page = alloc_page(GFP_KERNEL);
        if (!hsave_page)
                goto free_page3;

        svm->nested.hsave = page_address(hsave_page);

        svm->msrpm = page_address(msrpm_pages);
        svm_vcpu_init_msrpm(svm->msrpm);

        svm->nested.msrpm = page_address(nested_msrpm_pages);
        svm_vcpu_init_msrpm(svm->nested.msrpm);

        svm->vmcb = page_address(page);
        clear_page(svm->vmcb);
        svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
        svm->asid_generation = 0;
        init_vmcb(svm);

        svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE |
                                   MSR_IA32_APICBASE_ENABLE;
        if (kvm_vcpu_is_bsp(&svm->vcpu))
                svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;

        svm_init_osvw(&svm->vcpu);

        return &svm->vcpu;

free_page3:
        __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
free_page2:
        __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
free_page1:
        __free_page(page);
uninit:
        kvm_vcpu_uninit(&svm->vcpu);
free_svm:
        kmem_cache_free(kvm_vcpu_cache, svm);
out:
        return ERR_PTR(err);
}

static void svm_free_vcpu(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
        __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
        __free_page(virt_to_page(svm->nested.hsave));
        __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
        kvm_vcpu_uninit(vcpu);
        kmem_cache_free(kvm_vcpu_cache, svm);
}

static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        int i;

        if (unlikely(cpu != vcpu->cpu)) {
                svm->asid_generation = 0;
                mark_all_dirty(svm->vmcb);
        }

#ifdef CONFIG_X86_64
        rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
#endif
        savesegment(fs, svm->host.fs);
        savesegment(gs, svm->host.gs);
        svm->host.ldt = kvm_read_ldt();

        for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
                rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);

        if (static_cpu_has(X86_FEATURE_TSCRATEMSR) &&
            svm->tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
                __this_cpu_write(current_tsc_ratio, svm->tsc_ratio);
                wrmsrl(MSR_AMD64_TSC_RATIO, svm->tsc_ratio);
        }
}

static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        int i;

        ++vcpu->stat.host_state_reload;
        kvm_load_ldt(svm->host.ldt);
#ifdef CONFIG_X86_64
        loadsegment(fs, svm->host.fs);
        wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs);
        load_gs_index(svm->host.gs);
#else
#ifdef CONFIG_X86_32_LAZY_GS
        loadsegment(gs, svm->host.gs);
#endif
#endif
        for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
                wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
}

static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
        return to_svm(vcpu)->vmcb->save.rflags;
}

static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
       /*
        * Any change of EFLAGS.VM is accompained by a reload of SS
        * (caused by either a task switch or an inter-privilege IRET),
        * so we do not need to update the CPL here.
        */
        to_svm(vcpu)->vmcb->save.rflags = rflags;
}

static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
        switch (reg) {
        case VCPU_EXREG_PDPTR:
                BUG_ON(!npt_enabled);
                load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
                break;
        default:
                BUG();
        }
}

static void svm_set_vintr(struct vcpu_svm *svm)
{
        set_intercept(svm, INTERCEPT_VINTR);
}

static void svm_clear_vintr(struct vcpu_svm *svm)
{
        clr_intercept(svm, INTERCEPT_VINTR);
}

static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
        struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

        switch (seg) {
        case VCPU_SREG_CS: return &save->cs;
        case VCPU_SREG_DS: return &save->ds;
        case VCPU_SREG_ES: return &save->es;
        case VCPU_SREG_FS: return &save->fs;
        case VCPU_SREG_GS: return &save->gs;
        case VCPU_SREG_SS: return &save->ss;
        case VCPU_SREG_TR: return &save->tr;
        case VCPU_SREG_LDTR: return &save->ldtr;
        }
        BUG();
        return NULL;
}

static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
        struct vmcb_seg *s = svm_seg(vcpu, seg);

        return s->base;
}

static void svm_get_segment(struct kvm_vcpu *vcpu,
                            struct kvm_segment *var, int seg)
{
        struct vmcb_seg *s = svm_seg(vcpu, seg);

        var->base = s->base;
        var->limit = s->limit;
        var->selector = s->selector;
        var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
        var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
        var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
        var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
        var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
        var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
        var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;

        /*
         * AMD CPUs circa 2014 track the G bit for all segments except CS.
         * However, the SVM spec states that the G bit is not observed by the
         * CPU, and some VMware virtual CPUs drop the G bit for all segments.
         * So let's synthesize a legal G bit for all segments, this helps
         * running KVM nested. It also helps cross-vendor migration, because
         * Intel's vmentry has a check on the 'G' bit.
         */
        var->g = s->limit > 0xfffff;

        /*
         * AMD's VMCB does not have an explicit unusable field, so emulate it
         * for cross vendor migration purposes by "not present"
         */
        var->unusable = !var->present || (var->type == 0);

        switch (seg) {
        case VCPU_SREG_TR:
                /*
                 * Work around a bug where the busy flag in the tr selector
                 * isn't exposed
                 */
                var->type |= 0x2;
                break;
        case VCPU_SREG_DS:
        case VCPU_SREG_ES:
        case VCPU_SREG_FS:
        case VCPU_SREG_GS:
                /*
                 * The accessed bit must always be set in the segment
                 * descriptor cache, although it can be cleared in the
                 * descriptor, the cached bit always remains at 1. Since
                 * Intel has a check on this, set it here to support
                 * cross-vendor migration.
                 */
                if (!var->unusable)
                        var->type |= 0x1;
                break;
        case VCPU_SREG_SS:
                /*
                 * On AMD CPUs sometimes the DB bit in the segment
                 * descriptor is left as 1, although the whole segment has
                 * been made unusable. Clear it here to pass an Intel VMX
                 * entry check when cross vendor migrating.
                 */
                if (var->unusable)
                        var->db = 0;
                var->dpl = to_svm(vcpu)->vmcb->save.cpl;
                break;
        }
}

static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
        struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

        return save->cpl;
}

static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        dt->size = svm->vmcb->save.idtr.limit;
        dt->address = svm->vmcb->save.idtr.base;
}

static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.idtr.limit = dt->size;
        svm->vmcb->save.idtr.base = dt->address ;
        mark_dirty(svm->vmcb, VMCB_DT);
}

static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        dt->size = svm->vmcb->save.gdtr.limit;
        dt->address = svm->vmcb->save.gdtr.base;
}

static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.gdtr.limit = dt->size;
        svm->vmcb->save.gdtr.base = dt->address ;
        mark_dirty(svm->vmcb, VMCB_DT);
}

static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
{
}

static void svm_decache_cr3(struct kvm_vcpu *vcpu)
{
}

static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
{
}

static void update_cr0_intercept(struct vcpu_svm *svm)
{
        ulong gcr0 = svm->vcpu.arch.cr0;
        u64 *hcr0 = &svm->vmcb->save.cr0;

        if (!svm->vcpu.fpu_active)
                *hcr0 |= SVM_CR0_SELECTIVE_MASK;
        else
                *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
                        | (gcr0 & SVM_CR0_SELECTIVE_MASK);

        mark_dirty(svm->vmcb, VMCB_CR);

        if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
                clr_cr_intercept(svm, INTERCEPT_CR0_READ);
                clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
        } else {
                set_cr_intercept(svm, INTERCEPT_CR0_READ);
                set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
        }
}

static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
        struct vcpu_svm *svm = to_svm(vcpu);

#ifdef CONFIG_X86_64
        if (vcpu->arch.efer & EFER_LME) {
                if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
                        vcpu->arch.efer |= EFER_LMA;
                        svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
                }

                if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
                        vcpu->arch.efer &= ~EFER_LMA;
                        svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
                }
        }
#endif
        vcpu->arch.cr0 = cr0;

        if (!npt_enabled)
                cr0 |= X86_CR0_PG | X86_CR0_WP;

        if (!vcpu->fpu_active)
                cr0 |= X86_CR0_TS;
        /*
         * re-enable caching here because the QEMU bios
         * does not do it - this results in some delay at
         * reboot
         */
        cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
        svm->vmcb->save.cr0 = cr0;
        mark_dirty(svm->vmcb, VMCB_CR);
        update_cr0_intercept(svm);
}

static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
        unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
        unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;

        if (cr4 & X86_CR4_VMXE)
                return 1;

        if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
                svm_flush_tlb(vcpu);

        vcpu->arch.cr4 = cr4;
        if (!npt_enabled)
                cr4 |= X86_CR4_PAE;
        cr4 |= host_cr4_mce;
        to_svm(vcpu)->vmcb->save.cr4 = cr4;
        mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
        return 0;
}

static void svm_set_segment(struct kvm_vcpu *vcpu,
                            struct kvm_segment *var, int seg)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb_seg *s = svm_seg(vcpu, seg);

        s->base = var->base;
        s->limit = var->limit;
        s->selector = var->selector;
        if (var->unusable)
                s->attrib = 0;
        else {
                s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
                s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
                s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
                s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
                s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
                s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
                s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
                s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
        }

        /*
         * This is always accurate, except if SYSRET returned to a segment
         * with SS.DPL != 3.  Intel does not have this quirk, and always
         * forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
         * would entail passing the CPL to userspace and back.
         */
        if (seg == VCPU_SREG_SS)
                svm->vmcb->save.cpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;

        mark_dirty(svm->vmcb, VMCB_SEG);
}

static void update_db_bp_intercept(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        clr_exception_intercept(svm, DB_VECTOR);
        clr_exception_intercept(svm, BP_VECTOR);

        if (svm->nmi_singlestep)
                set_exception_intercept(svm, DB_VECTOR);

        if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
                if (vcpu->guest_debug &
                    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
                        set_exception_intercept(svm, DB_VECTOR);
                if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
                        set_exception_intercept(svm, BP_VECTOR);
        } else
                vcpu->guest_debug = 0;
}

static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
{
        if (sd->next_asid > sd->max_asid) {
                ++sd->asid_generation;
                sd->next_asid = 1;
                svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
        }

        svm->asid_generation = sd->asid_generation;
        svm->vmcb->control.asid = sd->next_asid++;

        mark_dirty(svm->vmcb, VMCB_ASID);
}

static u64 svm_get_dr6(struct kvm_vcpu *vcpu)
{
        return to_svm(vcpu)->vmcb->save.dr6;
}

static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.dr6 = value;
        mark_dirty(svm->vmcb, VMCB_DR);
}

static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        get_debugreg(vcpu->arch.db[0], 0);
        get_debugreg(vcpu->arch.db[1], 1);
        get_debugreg(vcpu->arch.db[2], 2);
        get_debugreg(vcpu->arch.db[3], 3);
        vcpu->arch.dr6 = svm_get_dr6(vcpu);
        vcpu->arch.dr7 = svm->vmcb->save.dr7;

        vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
        set_dr_intercepts(svm);
}

static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.dr7 = value;
        mark_dirty(svm->vmcb, VMCB_DR);
}

static int pf_interception(struct vcpu_svm *svm)
{
        u64 fault_address = svm->vmcb->control.exit_info_2;
        u32 error_code;
        int r = 1;

        switch (svm->apf_reason) {
        default:
                error_code = svm->vmcb->control.exit_info_1;

                trace_kvm_page_fault(fault_address, error_code);
                if (!npt_enabled && kvm_event_needs_reinjection(&svm->vcpu))
                        kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
                r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
                        svm->vmcb->control.insn_bytes,
                        svm->vmcb->control.insn_len);
                break;
        case KVM_PV_REASON_PAGE_NOT_PRESENT:
                svm->apf_reason = 0;
                local_irq_disable();
                kvm_async_pf_task_wait(fault_address);
                local_irq_enable();
                break;
        case KVM_PV_REASON_PAGE_READY:
                svm->apf_reason = 0;
                local_irq_disable();
                kvm_async_pf_task_wake(fault_address);
                local_irq_enable();
                break;
        }
        return r;
}

static int db_interception(struct vcpu_svm *svm)
{
        struct kvm_run *kvm_run = svm->vcpu.run;

        if (!(svm->vcpu.guest_debug &
              (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
                !svm->nmi_singlestep) {
                kvm_queue_exception(&svm->vcpu, DB_VECTOR);
                return 1;
        }

        if (svm->nmi_singlestep) {
                svm->nmi_singlestep = false;
                if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
                        svm->vmcb->save.rflags &=
                                ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
                update_db_bp_intercept(&svm->vcpu);
        }

        if (svm->vcpu.guest_debug &
            (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
                kvm_run->exit_reason = KVM_EXIT_DEBUG;
                kvm_run->debug.arch.pc =
                        svm->vmcb->save.cs.base + svm->vmcb->save.rip;
                kvm_run->debug.arch.exception = DB_VECTOR;
                return 0;
        }

        return 1;
}

static int bp_interception(struct vcpu_svm *svm)
{
        struct kvm_run *kvm_run = svm->vcpu.run;

        kvm_run->exit_reason = KVM_EXIT_DEBUG;
        kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
        kvm_run->debug.arch.exception = BP_VECTOR;
        return 0;
}

static int ud_interception(struct vcpu_svm *svm)
{
        int er;

        er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
        if (er != EMULATE_DONE)
                kvm_queue_exception(&svm->vcpu, UD_VECTOR);
        return 1;
}

static void svm_fpu_activate(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        clr_exception_intercept(svm, NM_VECTOR);

        svm->vcpu.fpu_active = 1;
        update_cr0_intercept(svm);
}

static int nm_interception(struct vcpu_svm *svm)
{
        svm_fpu_activate(&svm->vcpu);
        return 1;
}

static bool is_erratum_383(void)
{
        int err, i;
        u64 value;

        if (!erratum_383_found)
                return false;

        value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
        if (err)
                return false;

        /* Bit 62 may or may not be set for this mce */
        value &= ~(1ULL << 62);

        if (value != 0xb600000000010015ULL)
                return false;

        /* Clear MCi_STATUS registers */
        for (i = 0; i < 6; ++i)
                native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);

        value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
        if (!err) {
                u32 low, high;

                value &= ~(1ULL << 2);
                low    = lower_32_bits(value);
                high   = upper_32_bits(value);

                native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
        }

        /* Flush tlb to evict multi-match entries */
        __flush_tlb_all();

        return true;
}

static void svm_handle_mce(struct vcpu_svm *svm)
{
        if (is_erratum_383()) {
                /*
                 * Erratum 383 triggered. Guest state is corrupt so kill the
                 * guest.
                 */
                pr_err("KVM: Guest triggered AMD Erratum 383\n");

                kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);

                return;
        }

        /*
         * On an #MC intercept the MCE handler is not called automatically in
         * the host. So do it by hand here.
         */
        asm volatile (
                "int $0x12\n");
        /* not sure if we ever come back to this point */

        return;
}

static int mc_interception(struct vcpu_svm *svm)
{
        return 1;
}

static int shutdown_interception(struct vcpu_svm *svm)
{
        struct kvm_run *kvm_run = svm->vcpu.run;

        /*
         * VMCB is undefined after a SHUTDOWN intercept
         * so reinitialize it.
         */
        clear_page(svm->vmcb);
        init_vmcb(svm);

        kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
        return 0;
}

static int io_interception(struct vcpu_svm *svm)
{
        struct kvm_vcpu *vcpu = &svm->vcpu;
        u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
        int size, in, string;
        unsigned port;

        ++svm->vcpu.stat.io_exits;
        string = (io_info & SVM_IOIO_STR_MASK) != 0;
        in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
        if (string || in)
                return emulate_instruction(vcpu, 0) == EMULATE_DONE;

        port = io_info >> 16;
        size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
        svm->next_rip = svm->vmcb->control.exit_info_2;
        skip_emulated_instruction(&svm->vcpu);

        return kvm_fast_pio_out(vcpu, size, port);
}

static int nmi_interception(struct vcpu_svm *svm)
{
        return 1;
}

static int intr_interception(struct vcpu_svm *svm)
{
        ++svm->vcpu.stat.irq_exits;
        return 1;
}

static int nop_on_interception(struct vcpu_svm *svm)
{
        return 1;
}

static int halt_interception(struct vcpu_svm *svm)
{
        svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
        skip_emulated_instruction(&svm->vcpu);
        return kvm_emulate_halt(&svm->vcpu);
}

static int vmmcall_interception(struct vcpu_svm *svm)
{
        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);
        kvm_emulate_hypercall(&svm->vcpu);
        return 1;
}

static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        return svm->nested.nested_cr3;
}

static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u64 cr3 = svm->nested.nested_cr3;
        u64 pdpte;
        int ret;

        ret = kvm_read_guest_page(vcpu->kvm, gpa_to_gfn(cr3), &pdpte,
                                  offset_in_page(cr3) + index * 8, 8);
        if (ret)
                return 0;
        return pdpte;
}

static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
                                   unsigned long root)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->control.nested_cr3 = root;
        mark_dirty(svm->vmcb, VMCB_NPT);
        svm_flush_tlb(vcpu);
}

static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
                                       struct x86_exception *fault)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
                /*
                 * TODO: track the cause of the nested page fault, and
                 * correctly fill in the high bits of exit_info_1.
                 */
                svm->vmcb->control.exit_code = SVM_EXIT_NPF;
                svm->vmcb->control.exit_code_hi = 0;
                svm->vmcb->control.exit_info_1 = (1ULL << 32);
                svm->vmcb->control.exit_info_2 = fault->address;
        }

        svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
        svm->vmcb->control.exit_info_1 |= fault->error_code;

        /*
         * The present bit is always zero for page structure faults on real
         * hardware.
         */
        if (svm->vmcb->control.exit_info_1 & (2ULL << 32))
                svm->vmcb->control.exit_info_1 &= ~1;

        nested_svm_vmexit(svm);
}

static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
{
        WARN_ON(mmu_is_nested(vcpu));
        kvm_init_shadow_mmu(vcpu);
        vcpu->arch.mmu.set_cr3           = nested_svm_set_tdp_cr3;
        vcpu->arch.mmu.get_cr3           = nested_svm_get_tdp_cr3;
        vcpu->arch.mmu.get_pdptr         = nested_svm_get_tdp_pdptr;
        vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
        vcpu->arch.mmu.shadow_root_level = get_npt_level();
        vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
}

static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
{
        vcpu->arch.walk_mmu = &vcpu->arch.mmu;
}

static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
        if (!(svm->vcpu.arch.efer & EFER_SVME)
            || !is_paging(&svm->vcpu)) {
                kvm_queue_exception(&svm->vcpu, UD_VECTOR);
                return 1;
        }

        if (svm->vmcb->save.cpl) {
                kvm_inject_gp(&svm->vcpu, 0);
                return 1;
        }

       return 0;
}

static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
                                      bool has_error_code, u32 error_code)
{
        int vmexit;

        if (!is_guest_mode(&svm->vcpu))
                return 0;

        svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
        svm->vmcb->control.exit_code_hi = 0;
        svm->vmcb->control.exit_info_1 = error_code;
        svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;

        vmexit = nested_svm_intercept(svm);
        if (vmexit == NESTED_EXIT_DONE)
                svm->nested.exit_required = true;

        return vmexit;
}

/* This function returns true if it is save to enable the irq window */
static inline bool nested_svm_intr(struct vcpu_svm *svm)
{
        if (!is_guest_mode(&svm->vcpu))
                return true;

        if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
                return true;

        if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
                return false;

        /*
         * if vmexit was already requested (by intercepted exception
         * for instance) do not overwrite it with "external interrupt"
         * vmexit.
         */
        if (svm->nested.exit_required)
                return false;

        svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
        svm->vmcb->control.exit_info_1 = 0;
        svm->vmcb->control.exit_info_2 = 0;

        if (svm->nested.intercept & 1ULL) {
                /*
                 * The #vmexit can't be emulated here directly because this
                 * code path runs with irqs and preemption disabled. A
                 * #vmexit emulation might sleep. Only signal request for
                 * the #vmexit here.
                 */
                svm->nested.exit_required = true;
                trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
                return false;
        }

        return true;
}

/* This function returns true if it is save to enable the nmi window */
static inline bool nested_svm_nmi(struct vcpu_svm *svm)
{
        if (!is_guest_mode(&svm->vcpu))
                return true;

        if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
                return true;

        svm->vmcb->control.exit_code = SVM_EXIT_NMI;
        svm->nested.exit_required = true;

        return false;
}

static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
{
        struct page *page;

        might_sleep();

        page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
        if (is_error_page(page))
                goto error;

        *_page = page;

        return kmap(page);

error:
        kvm_inject_gp(&svm->vcpu, 0);

        return NULL;
}

static void nested_svm_unmap(struct page *page)
{
        kunmap(page);
        kvm_release_page_dirty(page);
}

static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
{
        unsigned port, size, iopm_len;
        u16 val, mask;
        u8 start_bit;
        u64 gpa;

        if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
                return NESTED_EXIT_HOST;

        port = svm->vmcb->control.exit_info_1 >> 16;
        size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
                SVM_IOIO_SIZE_SHIFT;
        gpa  = svm->nested.vmcb_iopm + (port / 8);
        start_bit = port % 8;
        iopm_len = (start_bit + size > 8) ? 2 : 1;
        mask = (0xf >> (4 - size)) << start_bit;
        val = 0;

        if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, iopm_len))
                return NESTED_EXIT_DONE;

        return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
}

static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
{
        u32 offset, msr, value;
        int write, mask;

        if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
                return NESTED_EXIT_HOST;

        msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
        offset = svm_msrpm_offset(msr);
        write  = svm->vmcb->control.exit_info_1 & 1;
        mask   = 1 << ((2 * (msr & 0xf)) + write);

        if (offset == MSR_INVALID)
                return NESTED_EXIT_DONE;

        /* Offset is in 32 bit units but need in 8 bit units */
        offset *= 4;

        if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4))
                return NESTED_EXIT_DONE;

        return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
}

static int nested_svm_exit_special(struct vcpu_svm *svm)
{
        u32 exit_code = svm->vmcb->control.exit_code;

        switch (exit_code) {
        case SVM_EXIT_INTR:
        case SVM_EXIT_NMI:
        case SVM_EXIT_EXCP_BASE + MC_VECTOR:
                return NESTED_EXIT_HOST;
        case SVM_EXIT_NPF:
                /* For now we are always handling NPFs when using them */
                if (npt_enabled)
                        return NESTED_EXIT_HOST;
                break;
        case SVM_EXIT_EXCP_BASE + PF_VECTOR:
                /* When we're shadowing, trap PFs, but not async PF */
                if (!npt_enabled && svm->apf_reason == 0)
                        return NESTED_EXIT_HOST;
                break;
        case SVM_EXIT_EXCP_BASE + NM_VECTOR:
                nm_interception(svm);
                break;
        default:
                break;
        }

        return NESTED_EXIT_CONTINUE;
}

/*
 * If this function returns true, this #vmexit was already handled
 */
static int nested_svm_intercept(struct vcpu_svm *svm)
{
        u32 exit_code = svm->vmcb->control.exit_code;
        int vmexit = NESTED_EXIT_HOST;

        switch (exit_code) {
        case SVM_EXIT_MSR:
                vmexit = nested_svm_exit_handled_msr(svm);
                break;
        case SVM_EXIT_IOIO:
                vmexit = nested_svm_intercept_ioio(svm);
                break;
        case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
                u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
                if (svm->nested.intercept_cr & bit)
                        vmexit = NESTED_EXIT_DONE;
                break;
        }
        case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
                u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
                if (svm->nested.intercept_dr & bit)
                        vmexit = NESTED_EXIT_DONE;
                break;
        }
        case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
                u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
                if (svm->nested.intercept_exceptions & excp_bits)
                        vmexit = NESTED_EXIT_DONE;
                /* async page fault always cause vmexit */
                else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
                         svm->apf_reason != 0)
                        vmexit = NESTED_EXIT_DONE;
                break;
        }
        case SVM_EXIT_ERR: {
                vmexit = NESTED_EXIT_DONE;
                break;
        }
        default: {
                u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
                if (svm->nested.intercept & exit_bits)
                        vmexit = NESTED_EXIT_DONE;
        }
        }

        return vmexit;
}

static int nested_svm_exit_handled(struct vcpu_svm *svm)
{
        int vmexit;

        vmexit = nested_svm_intercept(svm);

        if (vmexit == NESTED_EXIT_DONE)
                nested_svm_vmexit(svm);

        return vmexit;
}

static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
{
        struct vmcb_control_area *dst  = &dst_vmcb->control;
        struct vmcb_control_area *from = &from_vmcb->control;

        dst->intercept_cr         = from->intercept_cr;
        dst->intercept_dr         = from->intercept_dr;
        dst->intercept_exceptions = from->intercept_exceptions;
        dst->intercept            = from->intercept;
        dst->iopm_base_pa         = from->iopm_base_pa;
        dst->msrpm_base_pa        = from->msrpm_base_pa;
        dst->tsc_offset           = from->tsc_offset;
        dst->asid                 = from->asid;
        dst->tlb_ctl              = from->tlb_ctl;
        dst->int_ctl              = from->int_ctl;
        dst->int_vector           = from->int_vector;
        dst->int_state            = from->int_state;
        dst->exit_code            = from->exit_code;
        dst->exit_code_hi         = from->exit_code_hi;
        dst->exit_info_1          = from->exit_info_1;
        dst->exit_info_2          = from->exit_info_2;
        dst->exit_int_info        = from->exit_int_info;
        dst->exit_int_info_err    = from->exit_int_info_err;
        dst->nested_ctl           = from->nested_ctl;
        dst->event_inj            = from->event_inj;
        dst->event_inj_err        = from->event_inj_err;
        dst->nested_cr3           = from->nested_cr3;
        dst->lbr_ctl              = from->lbr_ctl;
}

static int nested_svm_vmexit(struct vcpu_svm *svm)
{
        struct vmcb *nested_vmcb;
        struct vmcb *hsave = svm->nested.hsave;
        struct vmcb *vmcb = svm->vmcb;
        struct page *page;

        trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
                                       vmcb->control.exit_info_1,
                                       vmcb->control.exit_info_2,
                                       vmcb->control.exit_int_info,
                                       vmcb->control.exit_int_info_err,
                                       KVM_ISA_SVM);

        nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
        if (!nested_vmcb)
                return 1;

        /* Exit Guest-Mode */
        leave_guest_mode(&svm->vcpu);
        svm->nested.vmcb = 0;

        /* Give the current vmcb to the guest */
        disable_gif(svm);

        nested_vmcb->save.es     = vmcb->save.es;
        nested_vmcb->save.cs     = vmcb->save.cs;
        nested_vmcb->save.ss     = vmcb->save.ss;
        nested_vmcb->save.ds     = vmcb->save.ds;
        nested_vmcb->save.gdtr   = vmcb->save.gdtr;
        nested_vmcb->save.idtr   = vmcb->save.idtr;
        nested_vmcb->save.efer   = svm->vcpu.arch.efer;
        nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
        nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
        nested_vmcb->save.cr2    = vmcb->save.cr2;
        nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
        nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
        nested_vmcb->save.rip    = vmcb->save.rip;
        nested_vmcb->save.rsp    = vmcb->save.rsp;
        nested_vmcb->save.rax    = vmcb->save.rax;
        nested_vmcb->save.dr7    = vmcb->save.dr7;
        nested_vmcb->save.dr6    = vmcb->save.dr6;
        nested_vmcb->save.cpl    = vmcb->save.cpl;

        nested_vmcb->control.int_ctl           = vmcb->control.int_ctl;
        nested_vmcb->control.int_vector        = vmcb->control.int_vector;
        nested_vmcb->control.int_state         = vmcb->control.int_state;
        nested_vmcb->control.exit_code         = vmcb->control.exit_code;
        nested_vmcb->control.exit_code_hi      = vmcb->control.exit_code_hi;
        nested_vmcb->control.exit_info_1       = vmcb->control.exit_info_1;
        nested_vmcb->control.exit_info_2       = vmcb->control.exit_info_2;
        nested_vmcb->control.exit_int_info     = vmcb->control.exit_int_info;
        nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
        nested_vmcb->control.next_rip          = vmcb->control.next_rip;

        /*
         * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
         * to make sure that we do not lose injected events. So check event_inj
         * here and copy it to exit_int_info if it is valid.
         * Exit_int_info and event_inj can't be both valid because the case
         * below only happens on a VMRUN instruction intercept which has
         * no valid exit_int_info set.
         */
        if (vmcb->control.event_inj & SVM_EVTINJ_VALID) {
                struct vmcb_control_area *nc = &nested_vmcb->control;

                nc->exit_int_info     = vmcb->control.event_inj;
                nc->exit_int_info_err = vmcb->control.event_inj_err;
        }

        nested_vmcb->control.tlb_ctl           = 0;
        nested_vmcb->control.event_inj         = 0;
        nested_vmcb->control.event_inj_err     = 0;

        /* We always set V_INTR_MASKING and remember the old value in hflags */
        if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
                nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;

        /* Restore the original control entries */
        copy_vmcb_control_area(vmcb, hsave);

        kvm_clear_exception_queue(&svm->vcpu);
        kvm_clear_interrupt_queue(&svm->vcpu);

        svm->nested.nested_cr3 = 0;

        /* Restore selected save entries */
        svm->vmcb->save.es = hsave->save.es;
        svm->vmcb->save.cs = hsave->save.cs;
        svm->vmcb->save.ss = hsave->save.ss;
        svm->vmcb->save.ds = hsave->save.ds;
        svm->vmcb->save.gdtr = hsave->save.gdtr;
        svm->vmcb->save.idtr = hsave->save.idtr;
        kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
        svm_set_efer(&svm->vcpu, hsave->save.efer);
        svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
        svm_set_cr4(&svm->vcpu, hsave->save.cr4);
        if (npt_enabled) {
                svm->vmcb->save.cr3 = hsave->save.cr3;
                svm->vcpu.arch.cr3 = hsave->save.cr3;
        } else {
                (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
        }
        kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
        kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
        kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
        svm->vmcb->save.dr7 = 0;
        svm->vmcb->save.cpl = 0;
        svm->vmcb->control.exit_int_info = 0;

        mark_all_dirty(svm->vmcb);

        nested_svm_unmap(page);

        nested_svm_uninit_mmu_context(&svm->vcpu);
        kvm_mmu_reset_context(&svm->vcpu);
        kvm_mmu_load(&svm->vcpu);

        return 0;
}

static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
{
        /*
         * This function merges the msr permission bitmaps of kvm and the
         * nested vmcb. It is optimized in that it only merges the parts where
         * the kvm msr permission bitmap may contain zero bits
         */
        int i;

        if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
                return true;

        for (i = 0; i < MSRPM_OFFSETS; i++) {
                u32 value, p;
                u64 offset;

                if (msrpm_offsets[i] == 0xffffffff)
                        break;

                p      = msrpm_offsets[i];
                offset = svm->nested.vmcb_msrpm + (p * 4);

                if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4))
                        return false;

                svm->nested.msrpm[p] = svm->msrpm[p] | value;
        }

        svm->vmcb->control.msrpm_base_pa = __pa(svm->nested.msrpm);

        return true;
}

static bool nested_vmcb_checks(struct vmcb *vmcb)
{
        if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
                return false;

        if (vmcb->control.asid == 0)
                return false;

        if (vmcb->control.nested_ctl && !npt_enabled)
                return false;

        return true;
}

static bool nested_svm_vmrun(struct vcpu_svm *svm)
{
        struct vmcb *nested_vmcb;
        struct vmcb *hsave = svm->nested.hsave;
        struct vmcb *vmcb = svm->vmcb;
        struct page *page;
        u64 vmcb_gpa;

        vmcb_gpa = svm->vmcb->save.rax;

        nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
        if (!nested_vmcb)
                return false;

        if (!nested_vmcb_checks(nested_vmcb)) {
                nested_vmcb->control.exit_code    = SVM_EXIT_ERR;
                nested_vmcb->control.exit_code_hi = 0;
                nested_vmcb->control.exit_info_1  = 0;
                nested_vmcb->control.exit_info_2  = 0;

                nested_svm_unmap(page);

                return false;
        }

        trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
                               nested_vmcb->save.rip,
                               nested_vmcb->control.int_ctl,
                               nested_vmcb->control.event_inj,
                               nested_vmcb->control.nested_ctl);

        trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
                                    nested_vmcb->control.intercept_cr >> 16,
                                    nested_vmcb->control.intercept_exceptions,
                                    nested_vmcb->control.intercept);

        /* Clear internal status */
        kvm_clear_exception_queue(&svm->vcpu);
        kvm_clear_interrupt_queue(&svm->vcpu);

        /*
         * Save the old vmcb, so we don't need to pick what we save, but can
         * restore everything when a VMEXIT occurs
         */
        hsave->save.es     = vmcb->save.es;
        hsave->save.cs     = vmcb->save.cs;
        hsave->save.ss     = vmcb->save.ss;
        hsave->save.ds     = vmcb->save.ds;
        hsave->save.gdtr   = vmcb->save.gdtr;
        hsave->save.idtr   = vmcb->save.idtr;
        hsave->save.efer   = svm->vcpu.arch.efer;
        hsave->save.cr0    = kvm_read_cr0(&svm->vcpu);
        hsave->save.cr4    = svm->vcpu.arch.cr4;
        hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
        hsave->save.rip    = kvm_rip_read(&svm->vcpu);
        hsave->save.rsp    = vmcb->save.rsp;
        hsave->save.rax    = vmcb->save.rax;
        if (npt_enabled)
                hsave->save.cr3    = vmcb->save.cr3;
        else
                hsave->save.cr3    = kvm_read_cr3(&svm->vcpu);

        copy_vmcb_control_area(hsave, vmcb);

        if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
                svm->vcpu.arch.hflags |= HF_HIF_MASK;
        else
                svm->vcpu.arch.hflags &= ~HF_HIF_MASK;

        if (nested_vmcb->control.nested_ctl) {
                kvm_mmu_unload(&svm->vcpu);
                svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
                nested_svm_init_mmu_context(&svm->vcpu);
        }

        /* Load the nested guest state */
        svm->vmcb->save.es = nested_vmcb->save.es;
        svm->vmcb->save.cs = nested_vmcb->save.cs;
        svm->vmcb->save.ss = nested_vmcb->save.ss;
        svm->vmcb->save.ds = nested_vmcb->save.ds;
        svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
        svm->vmcb->save.idtr = nested_vmcb->save.idtr;
        kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
        svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
        svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
        svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
        if (npt_enabled) {
                svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
                svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
        } else
                (void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);

        /* Guest paging mode is active - reset mmu */
        kvm_mmu_reset_context(&svm->vcpu);

        svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
        kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
        kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
        kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);

        /* In case we don't even reach vcpu_run, the fields are not updated */
        svm->vmcb->save.rax = nested_vmcb->save.rax;
        svm->vmcb->save.rsp = nested_vmcb->save.rsp;
        svm->vmcb->save.rip = nested_vmcb->save.rip;
        svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
        svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
        svm->vmcb->save.cpl = nested_vmcb->save.cpl;

        svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
        svm->nested.vmcb_iopm  = nested_vmcb->control.iopm_base_pa  & ~0x0fffULL;

        /* cache intercepts */
        svm->nested.intercept_cr         = nested_vmcb->control.intercept_cr;
        svm->nested.intercept_dr         = nested_vmcb->control.intercept_dr;
        svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
        svm->nested.intercept            = nested_vmcb->control.intercept;

        svm_flush_tlb(&svm->vcpu);
        svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
        if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
                svm->vcpu.arch.hflags |= HF_VINTR_MASK;
        else
                svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;

        if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
                /* We only want the cr8 intercept bits of the guest */
                clr_cr_intercept(svm, INTERCEPT_CR8_READ);
                clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
        }

        /* We don't want to see VMMCALLs from a nested guest */
        clr_intercept(svm, INTERCEPT_VMMCALL);

        svm->vmcb->control.lbr_ctl = nested_vmcb->control.lbr_ctl;
        svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
        svm->vmcb->control.int_state = nested_vmcb->control.int_state;
        svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
        svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
        svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;

        nested_svm_unmap(page);

        /* Enter Guest-Mode */
        enter_guest_mode(&svm->vcpu);

        /*
         * Merge guest and host intercepts - must be called  with vcpu in
         * guest-mode to take affect here
         */
        recalc_intercepts(svm);

        svm->nested.vmcb = vmcb_gpa;

        enable_gif(svm);

        mark_all_dirty(svm->vmcb);

        return true;
}

static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
{
        to_vmcb->save.fs = from_vmcb->save.fs;
        to_vmcb->save.gs = from_vmcb->save.gs;
        to_vmcb->save.tr = from_vmcb->save.tr;
        to_vmcb->save.ldtr = from_vmcb->save.ldtr;
        to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
        to_vmcb->save.star = from_vmcb->save.star;
        to_vmcb->save.lstar = from_vmcb->save.lstar;
        to_vmcb->save.cstar = from_vmcb->save.cstar;
        to_vmcb->save.sfmask = from_vmcb->save.sfmask;
        to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
        to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
        to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
}

static int vmload_interception(struct vcpu_svm *svm)
{
        struct vmcb *nested_vmcb;
        struct page *page;

        if (nested_svm_check_permissions(svm))
                return 1;

        nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
        if (!nested_vmcb)
                return 1;

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);

        nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
        nested_svm_unmap(page);

        return 1;
}

static int vmsave_interception(struct vcpu_svm *svm)
{
        struct vmcb *nested_vmcb;
        struct page *page;

        if (nested_svm_check_permissions(svm))
                return 1;

        nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
        if (!nested_vmcb)
                return 1;

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);

        nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
        nested_svm_unmap(page);

        return 1;
}

static int vmrun_interception(struct vcpu_svm *svm)
{
        if (nested_svm_check_permissions(svm))
                return 1;

        /* Save rip after vmrun instruction */
        kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);

        if (!nested_svm_vmrun(svm))
                return 1;

        if (!nested_svm_vmrun_msrpm(svm))
                goto failed;

        return 1;

failed:

        svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
        svm->vmcb->control.exit_code_hi = 0;
        svm->vmcb->control.exit_info_1  = 0;
        svm->vmcb->control.exit_info_2  = 0;

        nested_svm_vmexit(svm);

        return 1;
}

static int stgi_interception(struct vcpu_svm *svm)
{
        if (nested_svm_check_permissions(svm))
                return 1;

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);
        kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

        enable_gif(svm);

        return 1;
}

static int clgi_interception(struct vcpu_svm *svm)
{
        if (nested_svm_check_permissions(svm))
                return 1;

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);

        disable_gif(svm);

        /* After a CLGI no interrupts should come */
        svm_clear_vintr(svm);
        svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;

        mark_dirty(svm->vmcb, VMCB_INTR);

        return 1;
}

static int invlpga_interception(struct vcpu_svm *svm)
{
        struct kvm_vcpu *vcpu = &svm->vcpu;

        trace_kvm_invlpga(svm->vmcb->save.rip, vcpu->arch.regs[VCPU_REGS_RCX],
                          vcpu->arch.regs[VCPU_REGS_RAX]);

        /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
        kvm_mmu_invlpg(vcpu, vcpu->arch.regs[VCPU_REGS_RAX]);

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
        skip_emulated_instruction(&svm->vcpu);
        return 1;
}

static int skinit_interception(struct vcpu_svm *svm)
{
        trace_kvm_skinit(svm->vmcb->save.rip, svm->vcpu.arch.regs[VCPU_REGS_RAX]);

        kvm_queue_exception(&svm->vcpu, UD_VECTOR);
        return 1;
}

static int xsetbv_interception(struct vcpu_svm *svm)
{
        u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
        u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);

        if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
                svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
                skip_emulated_instruction(&svm->vcpu);
        }

        return 1;
}

static int task_switch_interception(struct vcpu_svm *svm)
{
        u16 tss_selector;
        int reason;
        int int_type = svm->vmcb->control.exit_int_info &
                SVM_EXITINTINFO_TYPE_MASK;
        int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
        uint32_t type =
                svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
        uint32_t idt_v =
                svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
        bool has_error_code = false;
        u32 error_code = 0;

        tss_selector = (u16)svm->vmcb->control.exit_info_1;

        if (svm->vmcb->control.exit_info_2 &
            (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
                reason = TASK_SWITCH_IRET;
        else if (svm->vmcb->control.exit_info_2 &
                 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
                reason = TASK_SWITCH_JMP;
        else if (idt_v)
                reason = TASK_SWITCH_GATE;
        else
                reason = TASK_SWITCH_CALL;

        if (reason == TASK_SWITCH_GATE) {
                switch (type) {
                case SVM_EXITINTINFO_TYPE_NMI:
                        svm->vcpu.arch.nmi_injected = false;
                        break;
                case SVM_EXITINTINFO_TYPE_EXEPT:
                        if (svm->vmcb->control.exit_info_2 &
                            (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
                                has_error_code = true;
                                error_code =
                                        (u32)svm->vmcb->control.exit_info_2;
                        }
                        kvm_clear_exception_queue(&svm->vcpu);
                        break;
                case SVM_EXITINTINFO_TYPE_INTR:
                        kvm_clear_interrupt_queue(&svm->vcpu);
                        break;
                default:
                        break;
                }
        }

        if (reason != TASK_SWITCH_GATE ||
            int_type == SVM_EXITINTINFO_TYPE_SOFT ||
            (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
             (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
                skip_emulated_instruction(&svm->vcpu);

        if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
                int_vec = -1;

        if (kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
                                has_error_code, error_code) == EMULATE_FAIL) {
                svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
                svm->vcpu.run->internal.ndata = 0;
                return 0;
        }
        return 1;
}

static int cpuid_interception(struct vcpu_svm *svm)
{
        svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
        kvm_emulate_cpuid(&svm->vcpu);
        return 1;
}

static int iret_interception(struct vcpu_svm *svm)
{
        ++svm->vcpu.stat.nmi_window_exits;
        clr_intercept(svm, INTERCEPT_IRET);
        svm->vcpu.arch.hflags |= HF_IRET_MASK;
        svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
        kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
        return 1;
}

static int invlpg_interception(struct vcpu_svm *svm)
{
        if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
                return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;

        kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
        skip_emulated_instruction(&svm->vcpu);
        return 1;
}

static int emulate_on_interception(struct vcpu_svm *svm)
{
        return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
}

static int rdpmc_interception(struct vcpu_svm *svm)
{
        int err;

        if (!static_cpu_has(X86_FEATURE_NRIPS))
                return emulate_on_interception(svm);

        err = kvm_rdpmc(&svm->vcpu);
        kvm_complete_insn_gp(&svm->vcpu, err);

        return 1;
}

bool check_selective_cr0_intercepted(struct vcpu_svm *svm, unsigned long val)
{
        unsigned long cr0 = svm->vcpu.arch.cr0;
        bool ret = false;
        u64 intercept;

        intercept = svm->nested.intercept;

        if (!is_guest_mode(&svm->vcpu) ||
            (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0))))
                return false;

        cr0 &= ~SVM_CR0_SELECTIVE_MASK;
        val &= ~SVM_CR0_SELECTIVE_MASK;

        if (cr0 ^ val) {
                svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
                ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
        }

        return ret;
}

#define CR_VALID (1ULL << 63)

static int cr_interception(struct vcpu_svm *svm)
{
        int reg, cr;
        unsigned long val;
        int err;

        if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
                return emulate_on_interception(svm);

        if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
                return emulate_on_interception(svm);

        reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
        cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;

        err = 0;
        if (cr >= 16) { /* mov to cr */
                cr -= 16;
                val = kvm_register_read(&svm->vcpu, reg);
                switch (cr) {
                case 0:
                        if (!check_selective_cr0_intercepted(svm, val))
                                err = kvm_set_cr0(&svm->vcpu, val);
                        else
                                return 1;

                        break;
                case 3:
                        err = kvm_set_cr3(&svm->vcpu, val);
                        break;
                case 4:
                        err = kvm_set_cr4(&svm->vcpu, val);
                        break;
                case 8:
                        err = kvm_set_cr8(&svm->vcpu, val);
                        break;
                default:
                        WARN(1, "unhandled write to CR%d", cr);
                        kvm_queue_exception(&svm->vcpu, UD_VECTOR);
                        return 1;
                }
        } else { /* mov from cr */
                switch (cr) {
                case 0:
                        val = kvm_read_cr0(&svm->vcpu);
                        break;
                case 2:
                        val = svm->vcpu.arch.cr2;
                        break;
                case 3:
                        val = kvm_read_cr3(&svm->vcpu);
                        break;
                case 4:
                        val = kvm_read_cr4(&svm->vcpu);
                        break;
                case 8:
                        val = kvm_get_cr8(&svm->vcpu);
                        break;
                default:
                        WARN(1, "unhandled read from CR%d", cr);
                        kvm_queue_exception(&svm->vcpu, UD_VECTOR);
                        return 1;
                }
                kvm_register_write(&svm->vcpu, reg, val);
        }
        kvm_complete_insn_gp(&svm->vcpu, err);

        return 1;
}

static int dr_interception(struct vcpu_svm *svm)
{
        int reg, dr;
        unsigned long val;

        if (svm->vcpu.guest_debug == 0) {
                /*
                 * No more DR vmexits; force a reload of the debug registers
                 * and reenter on this instruction.  The next vmexit will
                 * retrieve the full state of the debug registers.
                 */
                clr_dr_intercepts(svm);
                svm->vcpu.arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
                return 1;
        }

        if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
                return emulate_on_interception(svm);

        reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
        dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;

        if (dr >= 16) { /* mov to DRn */
                if (!kvm_require_dr(&svm->vcpu, dr - 16))
                        return 1;
                val = kvm_register_read(&svm->vcpu, reg);
                kvm_set_dr(&svm->vcpu, dr - 16, val);
        } else {
                if (!kvm_require_dr(&svm->vcpu, dr))
                        return 1;
                kvm_get_dr(&svm->vcpu, dr, &val);
                kvm_register_write(&svm->vcpu, reg, val);
        }

        skip_emulated_instruction(&svm->vcpu);

        return 1;
}

static int cr8_write_interception(struct vcpu_svm *svm)
{
        struct kvm_run *kvm_run = svm->vcpu.run;
        int r;

        u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
        /* instruction emulation calls kvm_set_cr8() */
        r = cr_interception(svm);
        if (irqchip_in_kernel(svm->vcpu.kvm))
                return r;
        if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
                return r;
        kvm_run->exit_reason = KVM_EXIT_SET_TPR;
        return 0;
}

static u64 svm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
{
        struct vmcb *vmcb = get_host_vmcb(to_svm(vcpu));
        return vmcb->control.tsc_offset +
                svm_scale_tsc(vcpu, host_tsc);
}

static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        switch (ecx) {
        case MSR_IA32_TSC: {
                *data = svm->vmcb->control.tsc_offset +
                        svm_scale_tsc(vcpu, native_read_tsc());

                break;
        }
        case MSR_STAR:
                *data = svm->vmcb->save.star;
                break;
#ifdef CONFIG_X86_64
        case MSR_LSTAR:
                *data = svm->vmcb->save.lstar;
                break;
        case MSR_CSTAR:
                *data = svm->vmcb->save.cstar;
                break;
        case MSR_KERNEL_GS_BASE:
                *data = svm->vmcb->save.kernel_gs_base;
                break;
        case MSR_SYSCALL_MASK:
                *data = svm->vmcb->save.sfmask;
                break;
#endif
        case MSR_IA32_SYSENTER_CS:
                *data = svm->vmcb->save.sysenter_cs;
                break;
        case MSR_IA32_SYSENTER_EIP:
                *data = svm->sysenter_eip;
                break;
        case MSR_IA32_SYSENTER_ESP:
                *data = svm->sysenter_esp;
                break;
        /*
         * Nobody will change the following 5 values in the VMCB so we can
         * safely return them on rdmsr. They will always be 0 until LBRV is
         * implemented.
         */
        case MSR_IA32_DEBUGCTLMSR:
                *data = svm->vmcb->save.dbgctl;
                break;
        case MSR_IA32_LASTBRANCHFROMIP:
                *data = svm->vmcb->save.br_from;
                break;
        case MSR_IA32_LASTBRANCHTOIP:
                *data = svm->vmcb->save.br_to;
                break;
        case MSR_IA32_LASTINTFROMIP:
                *data = svm->vmcb->save.last_excp_from;
                break;
        case MSR_IA32_LASTINTTOIP:
                *data = svm->vmcb->save.last_excp_to;
                break;
        case MSR_VM_HSAVE_PA:
                *data = svm->nested.hsave_msr;
                break;
        case MSR_VM_CR:
                *data = svm->nested.vm_cr_msr;
                break;
        case MSR_IA32_UCODE_REV:
                *data = 0x01000065;
                break;
        default:
                return kvm_get_msr_common(vcpu, ecx, data);
        }
        return 0;
}

static int rdmsr_interception(struct vcpu_svm *svm)
{
        u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
        u64 data;

        if (svm_get_msr(&svm->vcpu, ecx, &data)) {
                trace_kvm_msr_read_ex(ecx);
                kvm_inject_gp(&svm->vcpu, 0);
        } else {
                trace_kvm_msr_read(ecx, data);

                svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
                svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
                svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
                skip_emulated_instruction(&svm->vcpu);
        }
        return 1;
}

static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        int svm_dis, chg_mask;

        if (data & ~SVM_VM_CR_VALID_MASK)
                return 1;

        chg_mask = SVM_VM_CR_VALID_MASK;

        if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
                chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);

        svm->nested.vm_cr_msr &= ~chg_mask;
        svm->nested.vm_cr_msr |= (data & chg_mask);

        svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;

        /* check for svm_disable while efer.svme is set */
        if (svm_dis && (vcpu->arch.efer & EFER_SVME))
                return 1;

        return 0;
}

static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        u32 ecx = msr->index;
        u64 data = msr->data;
        switch (ecx) {
        case MSR_IA32_TSC:
                kvm_write_tsc(vcpu, msr);
                break;
        case MSR_STAR:
                svm->vmcb->save.star = data;
                break;
#ifdef CONFIG_X86_64
        case MSR_LSTAR:
                svm->vmcb->save.lstar = data;
                break;
        case MSR_CSTAR:
                svm->vmcb->save.cstar = data;
                break;
        case MSR_KERNEL_GS_BASE:
                svm->vmcb->save.kernel_gs_base = data;
                break;
        case MSR_SYSCALL_MASK:
                svm->vmcb->save.sfmask = data;
                break;
#endif
        case MSR_IA32_SYSENTER_CS:
                svm->vmcb->save.sysenter_cs = data;
                break;
        case MSR_IA32_SYSENTER_EIP:
                svm->sysenter_eip = data;
                svm->vmcb->save.sysenter_eip = data;
                break;
        case MSR_IA32_SYSENTER_ESP:
                svm->sysenter_esp = data;
                svm->vmcb->save.sysenter_esp = data;
                break;
        case MSR_IA32_DEBUGCTLMSR:
                if (!boot_cpu_has(X86_FEATURE_LBRV)) {
                        vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
                                    __func__, data);
                        break;
                }
                if (data & DEBUGCTL_RESERVED_BITS)
                        return 1;

                svm->vmcb->save.dbgctl = data;
                mark_dirty(svm->vmcb, VMCB_LBR);
                if (data & (1ULL<<0))
                        svm_enable_lbrv(svm);
                else
                        svm_disable_lbrv(svm);
                break;
        case MSR_VM_HSAVE_PA:
                svm->nested.hsave_msr = data;
                break;
        case MSR_VM_CR:
                return svm_set_vm_cr(vcpu, data);
        case MSR_VM_IGNNE:
                vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
                break;
        default:
                return kvm_set_msr_common(vcpu, msr);
        }
        return 0;
}

static int wrmsr_interception(struct vcpu_svm *svm)
{
        struct msr_data msr;
        u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
        u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
                | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);

        msr.data = data;
        msr.index = ecx;
        msr.host_initiated = false;

        svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
        if (kvm_set_msr(&svm->vcpu, &msr)) {
                trace_kvm_msr_write_ex(ecx, data);
                kvm_inject_gp(&svm->vcpu, 0);
        } else {
                trace_kvm_msr_write(ecx, data);
                skip_emulated_instruction(&svm->vcpu);
        }
        return 1;
}

static int msr_interception(struct vcpu_svm *svm)
{
        if (svm->vmcb->control.exit_info_1)
                return wrmsr_interception(svm);
        else
                return rdmsr_interception(svm);
}

static int interrupt_window_interception(struct vcpu_svm *svm)
{
        struct kvm_run *kvm_run = svm->vcpu.run;

        kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
        svm_clear_vintr(svm);
        svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
        mark_dirty(svm->vmcb, VMCB_INTR);
        ++svm->vcpu.stat.irq_window_exits;
        /*
         * If the user space waits to inject interrupts, exit as soon as
         * possible
         */
        if (!irqchip_in_kernel(svm->vcpu.kvm) &&
            kvm_run->request_interrupt_window &&
            !kvm_cpu_has_interrupt(&svm->vcpu)) {
                kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
                return 0;
        }

        return 1;
}

static int pause_interception(struct vcpu_svm *svm)
{
        kvm_vcpu_on_spin(&(svm->vcpu));
        return 1;
}

static int nop_interception(struct vcpu_svm *svm)
{
        skip_emulated_instruction(&(svm->vcpu));
        return 1;
}

static int monitor_interception(struct vcpu_svm *svm)
{
        printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
        return nop_interception(svm);
}

static int mwait_interception(struct vcpu_svm *svm)
{
        printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n");
        return nop_interception(svm);
}

static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
        [SVM_EXIT_READ_CR0]                     = cr_interception,
        [SVM_EXIT_READ_CR3]                     = cr_interception,
        [SVM_EXIT_READ_CR4]                     = cr_interception,
        [SVM_EXIT_READ_CR8]                     = cr_interception,
        [SVM_EXIT_CR0_SEL_WRITE]                = emulate_on_interception,
        [SVM_EXIT_WRITE_CR0]                    = cr_interception,
        [SVM_EXIT_WRITE_CR3]                    = cr_interception,
        [SVM_EXIT_WRITE_CR4]                    = cr_interception,
        [SVM_EXIT_WRITE_CR8]                    = cr8_write_interception,
        [SVM_EXIT_READ_DR0]                     = dr_interception,
        [SVM_EXIT_READ_DR1]                     = dr_interception,
        [SVM_EXIT_READ_DR2]                     = dr_interception,
        [SVM_EXIT_READ_DR3]                     = dr_interception,
        [SVM_EXIT_READ_DR4]                     = dr_interception,
        [SVM_EXIT_READ_DR5]                     = dr_interception,
        [SVM_EXIT_READ_DR6]                     = dr_interception,
        [SVM_EXIT_READ_DR7]                     = dr_interception,
        [SVM_EXIT_WRITE_DR0]                    = dr_interception,
        [SVM_EXIT_WRITE_DR1]                    = dr_interception,
        [SVM_EXIT_WRITE_DR2]                    = dr_interception,
        [SVM_EXIT_WRITE_DR3]                    = dr_interception,
        [SVM_EXIT_WRITE_DR4]                    = dr_interception,
        [SVM_EXIT_WRITE_DR5]                    = dr_interception,
        [SVM_EXIT_WRITE_DR6]                    = dr_interception,
        [SVM_EXIT_WRITE_DR7]                    = dr_interception,
        [SVM_EXIT_EXCP_BASE + DB_VECTOR]        = db_interception,
        [SVM_EXIT_EXCP_BASE + BP_VECTOR]        = bp_interception,
        [SVM_EXIT_EXCP_BASE + UD_VECTOR]        = ud_interception,
        [SVM_EXIT_EXCP_BASE + PF_VECTOR]        = pf_interception,
        [SVM_EXIT_EXCP_BASE + NM_VECTOR]        = nm_interception,
        [SVM_EXIT_EXCP_BASE + MC_VECTOR]        = mc_interception,
        [SVM_EXIT_INTR]                         = intr_interception,
        [SVM_EXIT_NMI]                          = nmi_interception,
        [SVM_EXIT_SMI]                          = nop_on_interception,
        [SVM_EXIT_INIT]                         = nop_on_interception,
        [SVM_EXIT_VINTR]                        = interrupt_window_interception,
        [SVM_EXIT_RDPMC]                        = rdpmc_interception,
        [SVM_EXIT_CPUID]                        = cpuid_interception,
        [SVM_EXIT_IRET]                         = iret_interception,
        [SVM_EXIT_INVD]                         = emulate_on_interception,
        [SVM_EXIT_PAUSE]                        = pause_interception,
        [SVM_EXIT_HLT]                          = halt_interception,
        [SVM_EXIT_INVLPG]                       = invlpg_interception,
        [SVM_EXIT_INVLPGA]                      = invlpga_interception,
        [SVM_EXIT_IOIO]                         = io_interception,
        [SVM_EXIT_MSR]                          = msr_interception,
        [SVM_EXIT_TASK_SWITCH]                  = task_switch_interception,
        [SVM_EXIT_SHUTDOWN]                     = shutdown_interception,
        [SVM_EXIT_VMRUN]                        = vmrun_interception,
        [SVM_EXIT_VMMCALL]                      = vmmcall_interception,
        [SVM_EXIT_VMLOAD]                       = vmload_interception,
        [SVM_EXIT_VMSAVE]                       = vmsave_interception,
        [SVM_EXIT_STGI]                         = stgi_interception,
        [SVM_EXIT_CLGI]                         = clgi_interception,
        [SVM_EXIT_SKINIT]                       = skinit_interception,
        [SVM_EXIT_WBINVD]                       = emulate_on_interception,
        [SVM_EXIT_MONITOR]                      = monitor_interception,
        [SVM_EXIT_MWAIT]                        = mwait_interception,
        [SVM_EXIT_XSETBV]                       = xsetbv_interception,
        [SVM_EXIT_NPF]                          = pf_interception,
};

static void dump_vmcb(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb_control_area *control = &svm->vmcb->control;
        struct vmcb_save_area *save = &svm->vmcb->save;

        pr_err("VMCB Control Area:\n");
        pr_err("%-20s%04x\n", "cr_read:", control->intercept_cr & 0xffff);
        pr_err("%-20s%04x\n", "cr_write:", control->intercept_cr >> 16);
        pr_err("%-20s%04x\n", "dr_read:", control->intercept_dr & 0xffff);
        pr_err("%-20s%04x\n", "dr_write:", control->intercept_dr >> 16);
        pr_err("%-20s%08x\n", "exceptions:", control->intercept_exceptions);
        pr_err("%-20s%016llx\n", "intercepts:", control->intercept);
        pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
        pr_err("%-20s%016llx\n", "iopm_base_pa:", control->iopm_base_pa);
        pr_err("%-20s%016llx\n", "msrpm_base_pa:", control->msrpm_base_pa);
        pr_err("%-20s%016llx\n", "tsc_offset:", control->tsc_offset);
        pr_err("%-20s%d\n", "asid:", control->asid);
        pr_err("%-20s%d\n", "tlb_ctl:", control->tlb_ctl);
        pr_err("%-20s%08x\n", "int_ctl:", control->int_ctl);
        pr_err("%-20s%08x\n", "int_vector:", control->int_vector);
        pr_err("%-20s%08x\n", "int_state:", control->int_state);
        pr_err("%-20s%08x\n", "exit_code:", control->exit_code);
        pr_err("%-20s%016llx\n", "exit_info1:", control->exit_info_1);
        pr_err("%-20s%016llx\n", "exit_info2:", control->exit_info_2);
        pr_err("%-20s%08x\n", "exit_int_info:", control->exit_int_info);
        pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
        pr_err("%-20s%lld\n", "nested_ctl:", control->nested_ctl);
        pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
        pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
        pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
        pr_err("%-20s%lld\n", "lbr_ctl:", control->lbr_ctl);
        pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
        pr_err("VMCB State Save Area:\n");
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "es:",
               save->es.selector, save->es.attrib,
               save->es.limit, save->es.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "cs:",
               save->cs.selector, save->cs.attrib,
               save->cs.limit, save->cs.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "ss:",
               save->ss.selector, save->ss.attrib,
               save->ss.limit, save->ss.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "ds:",
               save->ds.selector, save->ds.attrib,
               save->ds.limit, save->ds.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "fs:",
               save->fs.selector, save->fs.attrib,
               save->fs.limit, save->fs.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "gs:",
               save->gs.selector, save->gs.attrib,
               save->gs.limit, save->gs.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "gdtr:",
               save->gdtr.selector, save->gdtr.attrib,
               save->gdtr.limit, save->gdtr.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "ldtr:",
               save->ldtr.selector, save->ldtr.attrib,
               save->ldtr.limit, save->ldtr.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "idtr:",
               save->idtr.selector, save->idtr.attrib,
               save->idtr.limit, save->idtr.base);
        pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
               "tr:",
               save->tr.selector, save->tr.attrib,
               save->tr.limit, save->tr.base);
        pr_err("cpl:            %d                efer:         %016llx\n",
                save->cpl, save->efer);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "cr0:", save->cr0, "cr2:", save->cr2);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "cr3:", save->cr3, "cr4:", save->cr4);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "dr6:", save->dr6, "dr7:", save->dr7);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "rip:", save->rip, "rflags:", save->rflags);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "rsp:", save->rsp, "rax:", save->rax);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "star:", save->star, "lstar:", save->lstar);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "cstar:", save->cstar, "sfmask:", save->sfmask);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "kernel_gs_base:", save->kernel_gs_base,
               "sysenter_cs:", save->sysenter_cs);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "sysenter_esp:", save->sysenter_esp,
               "sysenter_eip:", save->sysenter_eip);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "gpat:", save->g_pat, "dbgctl:", save->dbgctl);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "br_from:", save->br_from, "br_to:", save->br_to);
        pr_err("%-15s %016llx %-13s %016llx\n",
               "excp_from:", save->last_excp_from,
               "excp_to:", save->last_excp_to);
}

static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
{
        struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;

        *info1 = control->exit_info_1;
        *info2 = control->exit_info_2;
}

static int handle_exit(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct kvm_run *kvm_run = vcpu->run;
        u32 exit_code = svm->vmcb->control.exit_code;

        if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
                vcpu->arch.cr0 = svm->vmcb->save.cr0;
        if (npt_enabled)
                vcpu->arch.cr3 = svm->vmcb->save.cr3;

        if (unlikely(svm->nested.exit_required)) {
                nested_svm_vmexit(svm);
                svm->nested.exit_required = false;

                return 1;
        }

        if (is_guest_mode(vcpu)) {
                int vmexit;

                trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
                                        svm->vmcb->control.exit_info_1,
                                        svm->vmcb->control.exit_info_2,
                                        svm->vmcb->control.exit_int_info,
                                        svm->vmcb->control.exit_int_info_err,
                                        KVM_ISA_SVM);

                vmexit = nested_svm_exit_special(svm);

                if (vmexit == NESTED_EXIT_CONTINUE)
                        vmexit = nested_svm_exit_handled(svm);

                if (vmexit == NESTED_EXIT_DONE)
                        return 1;
        }

        svm_complete_interrupts(svm);

        if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
                kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
                kvm_run->fail_entry.hardware_entry_failure_reason
                        = svm->vmcb->control.exit_code;
                pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
                dump_vmcb(vcpu);
                return 0;
        }

        if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
            exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
            exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
            exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
                printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
                       "exit_code 0x%x\n",
                       __func__, svm->vmcb->control.exit_int_info,
                       exit_code);

        if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
            || !svm_exit_handlers[exit_code]) {
                WARN_ONCE(1, "vmx: unexpected exit reason 0x%x\n", exit_code);
                kvm_queue_exception(vcpu, UD_VECTOR);
                return 1;
        }

        return svm_exit_handlers[exit_code](svm);
}

static void reload_tss(struct kvm_vcpu *vcpu)
{
        int cpu = raw_smp_processor_id();

        struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
        sd->tss_desc->type = 9; /* available 32/64-bit TSS */
        load_TR_desc();
}

static void pre_svm_run(struct vcpu_svm *svm)
{
        int cpu = raw_smp_processor_id();

        struct svm_cpu_data *sd = per_cpu(svm_data, cpu);

        /* FIXME: handle wraparound of asid_generation */
        if (svm->asid_generation != sd->asid_generation)
                new_asid(svm, sd);
}

static void svm_inject_nmi(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
        vcpu->arch.hflags |= HF_NMI_MASK;
        set_intercept(svm, INTERCEPT_IRET);
        ++vcpu->stat.nmi_injections;
}

static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
{
        struct vmcb_control_area *control;

        control = &svm->vmcb->control;
        control->int_vector = irq;
        control->int_ctl &= ~V_INTR_PRIO_MASK;
        control->int_ctl |= V_IRQ_MASK |
                ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
        mark_dirty(svm->vmcb, VMCB_INTR);
}

static void svm_set_irq(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        BUG_ON(!(gif_set(svm)));

        trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
        ++vcpu->stat.irq_injections;

        svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
                SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
}

static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
                return;

        clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);

        if (irr == -1)
                return;

        if (tpr >= irr)
                set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
}

static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
{
        return;
}

static int svm_vm_has_apicv(struct kvm *kvm)
{
        return 0;
}

static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
{
        return;
}

static void svm_sync_pir_to_irr(struct kvm_vcpu *vcpu)
{
        return;
}

static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb *vmcb = svm->vmcb;
        int ret;
        ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
              !(svm->vcpu.arch.hflags & HF_NMI_MASK);
        ret = ret && gif_set(svm) && nested_svm_nmi(svm);

        return ret;
}

static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
}

static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (masked) {
                svm->vcpu.arch.hflags |= HF_NMI_MASK;
                set_intercept(svm, INTERCEPT_IRET);
        } else {
                svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
                clr_intercept(svm, INTERCEPT_IRET);
        }
}

static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb *vmcb = svm->vmcb;
        int ret;

        if (!gif_set(svm) ||
             (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
                return 0;

        ret = !!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF);

        if (is_guest_mode(vcpu))
                return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);

        return ret;
}

static void enable_irq_window(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        /*
         * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
         * 1, because that's a separate STGI/VMRUN intercept.  The next time we
         * get that intercept, this function will be called again though and
         * we'll get the vintr intercept.
         */
        if (gif_set(svm) && nested_svm_intr(svm)) {
                svm_set_vintr(svm);
                svm_inject_irq(svm, 0x0);
        }
}

static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
            == HF_NMI_MASK)
                return; /* IRET will cause a vm exit */

        /*
         * Something prevents NMI from been injected. Single step over possible
         * problem (IRET or exception injection or interrupt shadow)
         */
        svm->nmi_singlestep = true;
        svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
        update_db_bp_intercept(vcpu);
}

static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
        return 0;
}

static void svm_flush_tlb(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (static_cpu_has(X86_FEATURE_FLUSHBYASID))
                svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
        else
                svm->asid_generation--;
}

static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
{
}

static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
                return;

        if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
                int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
                kvm_set_cr8(vcpu, cr8);
        }
}

static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        u64 cr8;

        if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
                return;

        cr8 = kvm_get_cr8(vcpu);
        svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
        svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

static void svm_complete_interrupts(struct vcpu_svm *svm)
{
        u8 vector;
        int type;
        u32 exitintinfo = svm->vmcb->control.exit_int_info;
        unsigned int3_injected = svm->int3_injected;

        svm->int3_injected = 0;

        /*
         * If we've made progress since setting HF_IRET_MASK, we've
         * executed an IRET and can allow NMI injection.
         */
        if ((svm->vcpu.arch.hflags & HF_IRET_MASK)
            && kvm_rip_read(&svm->vcpu) != svm->nmi_iret_rip) {
                svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
                kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
        }

        svm->vcpu.arch.nmi_injected = false;
        kvm_clear_exception_queue(&svm->vcpu);
        kvm_clear_interrupt_queue(&svm->vcpu);

        if (!(exitintinfo & SVM_EXITINTINFO_VALID))
                return;

        kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

        vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
        type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;

        switch (type) {
        case SVM_EXITINTINFO_TYPE_NMI:
                svm->vcpu.arch.nmi_injected = true;
                break;
        case SVM_EXITINTINFO_TYPE_EXEPT:
                /*
                 * In case of software exceptions, do not reinject the vector,
                 * but re-execute the instruction instead. Rewind RIP first
                 * if we emulated INT3 before.
                 */
                if (kvm_exception_is_soft(vector)) {
                        if (vector == BP_VECTOR && int3_injected &&
                            kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
                                kvm_rip_write(&svm->vcpu,
                                              kvm_rip_read(&svm->vcpu) -
                                              int3_injected);
                        break;
                }
                if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
                        u32 err = svm->vmcb->control.exit_int_info_err;
                        kvm_requeue_exception_e(&svm->vcpu, vector, err);

                } else
                        kvm_requeue_exception(&svm->vcpu, vector);
                break;
        case SVM_EXITINTINFO_TYPE_INTR:
                kvm_queue_interrupt(&svm->vcpu, vector, false);
                break;
        default:
                break;
        }
}

static void svm_cancel_injection(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb_control_area *control = &svm->vmcb->control;

        control->exit_int_info = control->event_inj;
        control->exit_int_info_err = control->event_inj_err;
        control->event_inj = 0;
        svm_complete_interrupts(svm);
}

static void svm_vcpu_run(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
        svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
        svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];

        /*
         * A vmexit emulation is required before the vcpu can be executed
         * again.
         */
        if (unlikely(svm->nested.exit_required))
                return;

        pre_svm_run(svm);

        sync_lapic_to_cr8(vcpu);

        svm->vmcb->save.cr2 = vcpu->arch.cr2;

        clgi();

        local_irq_enable();

        asm volatile (
                "push %%" _ASM_BP "; \n\t"
                "mov %c[rbx](%[svm]), %%" _ASM_BX " \n\t"
                "mov %c[rcx](%[svm]), %%" _ASM_CX " \n\t"
                "mov %c[rdx](%[svm]), %%" _ASM_DX " \n\t"
                "mov %c[rsi](%[svm]), %%" _ASM_SI " \n\t"
                "mov %c[rdi](%[svm]), %%" _ASM_DI " \n\t"
                "mov %c[rbp](%[svm]), %%" _ASM_BP " \n\t"
#ifdef CONFIG_X86_64
                "mov %c[r8](%[svm]),  %%r8  \n\t"
                "mov %c[r9](%[svm]),  %%r9  \n\t"
                "mov %c[r10](%[svm]), %%r10 \n\t"
                "mov %c[r11](%[svm]), %%r11 \n\t"
                "mov %c[r12](%[svm]), %%r12 \n\t"
                "mov %c[r13](%[svm]), %%r13 \n\t"
                "mov %c[r14](%[svm]), %%r14 \n\t"
                "mov %c[r15](%[svm]), %%r15 \n\t"
#endif

                /* Enter guest mode */
                "push %%" _ASM_AX " \n\t"
                "mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t"
                __ex(SVM_VMLOAD) "\n\t"
                __ex(SVM_VMRUN) "\n\t"
                __ex(SVM_VMSAVE) "\n\t"
                "pop %%" _ASM_AX " \n\t"

                /* Save guest registers, load host registers */
                "mov %%" _ASM_BX ", %c[rbx](%[svm]) \n\t"
                "mov %%" _ASM_CX ", %c[rcx](%[svm]) \n\t"
                "mov %%" _ASM_DX ", %c[rdx](%[svm]) \n\t"
                "mov %%" _ASM_SI ", %c[rsi](%[svm]) \n\t"
                "mov %%" _ASM_DI ", %c[rdi](%[svm]) \n\t"
                "mov %%" _ASM_BP ", %c[rbp](%[svm]) \n\t"
#ifdef CONFIG_X86_64
                "mov %%r8,  %c[r8](%[svm]) \n\t"
                "mov %%r9,  %c[r9](%[svm]) \n\t"
                "mov %%r10, %c[r10](%[svm]) \n\t"
                "mov %%r11, %c[r11](%[svm]) \n\t"
                "mov %%r12, %c[r12](%[svm]) \n\t"
                "mov %%r13, %c[r13](%[svm]) \n\t"
                "mov %%r14, %c[r14](%[svm]) \n\t"
                "mov %%r15, %c[r15](%[svm]) \n\t"
#endif
                "pop %%" _ASM_BP
                :
                : [svm]"a"(svm),
                  [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
                  [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
                  [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
                  [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
                  [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
                  [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
                  [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
#ifdef CONFIG_X86_64
                  , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
                  [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
                  [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
                  [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
                  [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
                  [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
                  [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
                  [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
#endif
                : "cc", "memory"
#ifdef CONFIG_X86_64
                , "rbx", "rcx", "rdx", "rsi", "rdi"
                , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
#else
                , "ebx", "ecx", "edx", "esi", "edi"
#endif
                );

#ifdef CONFIG_X86_64
        wrmsrl(MSR_GS_BASE, svm->host.gs_base);
#else
        loadsegment(fs, svm->host.fs);
#ifndef CONFIG_X86_32_LAZY_GS
        loadsegment(gs, svm->host.gs);
#endif
#endif

        reload_tss(vcpu);

        local_irq_disable();

        vcpu->arch.cr2 = svm->vmcb->save.cr2;
        vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
        vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
        vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;

        trace_kvm_exit(svm->vmcb->control.exit_code, vcpu, KVM_ISA_SVM);

        if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
                kvm_before_handle_nmi(&svm->vcpu);

        stgi();

        /* Any pending NMI will happen here */

        if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
                kvm_after_handle_nmi(&svm->vcpu);

        sync_cr8_to_lapic(vcpu);

        svm->next_rip = 0;

        svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

        /* if exit due to PF check for async PF */
        if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
                svm->apf_reason = kvm_read_and_reset_pf_reason();

        if (npt_enabled) {
                vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
                vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
        }

        /*
         * We need to handle MC intercepts here before the vcpu has a chance to
         * change the physical cpu
         */
        if (unlikely(svm->vmcb->control.exit_code ==
                     SVM_EXIT_EXCP_BASE + MC_VECTOR))
                svm_handle_mce(svm);

        mark_all_clean(svm->vmcb);
}

static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->save.cr3 = root;
        mark_dirty(svm->vmcb, VMCB_CR);
        svm_flush_tlb(vcpu);
}

static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        svm->vmcb->control.nested_cr3 = root;
        mark_dirty(svm->vmcb, VMCB_NPT);

        /* Also sync guest cr3 here in case we live migrate */
        svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
        mark_dirty(svm->vmcb, VMCB_CR);

        svm_flush_tlb(vcpu);
}

static int is_disabled(void)
{
        u64 vm_cr;

        rdmsrl(MSR_VM_CR, vm_cr);
        if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
                return 1;

        return 0;
}

static void
svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
{
        /*
         * Patch in the VMMCALL instruction:
         */
        hypercall[0] = 0x0f;
        hypercall[1] = 0x01;
        hypercall[2] = 0xd9;
}

static void svm_check_processor_compat(void *rtn)
{
        *(int *)rtn = 0;
}

static bool svm_cpu_has_accelerated_tpr(void)
{
        return false;
}

static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
        return 0;
}

static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
}

static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
        switch (func) {
        case 0x80000001:
                if (nested)
                        entry->ecx |= (1 << 2); /* Set SVM bit */
                break;
        case 0x8000000A:
                entry->eax = 1; /* SVM revision 1 */
                entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
                                   ASID emulation to nested SVM */
                entry->ecx = 0; /* Reserved */
                entry->edx = 0; /* Per default do not support any
                                   additional features */

                /* Support next_rip if host supports it */
                if (boot_cpu_has(X86_FEATURE_NRIPS))
                        entry->edx |= SVM_FEATURE_NRIP;

                /* Support NPT for the guest if enabled */
                if (npt_enabled)
                        entry->edx |= SVM_FEATURE_NPT;

                break;
        }
}

static int svm_get_lpage_level(void)
{
        return PT_PDPE_LEVEL;
}

static bool svm_rdtscp_supported(void)
{
        return false;
}

static bool svm_invpcid_supported(void)
{
        return false;
}

static bool svm_mpx_supported(void)
{
        return false;
}

static bool svm_xsaves_supported(void)
{
        return false;
}

static bool svm_has_wbinvd_exit(void)
{
        return true;
}

static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
{
        struct vcpu_svm *svm = to_svm(vcpu);

        set_exception_intercept(svm, NM_VECTOR);
        update_cr0_intercept(svm);
}

#define PRE_EX(exit)  { .exit_code = (exit), \
                        .stage = X86_ICPT_PRE_EXCEPT, }
#define POST_EX(exit) { .exit_code = (exit), \
                        .stage = X86_ICPT_POST_EXCEPT, }
#define POST_MEM(exit) { .exit_code = (exit), \
                        .stage = X86_ICPT_POST_MEMACCESS, }

static const struct __x86_intercept {
        u32 exit_code;
        enum x86_intercept_stage stage;
} x86_intercept_map[] = {
        [x86_intercept_cr_read]         = POST_EX(SVM_EXIT_READ_CR0),
        [x86_intercept_cr_write]        = POST_EX(SVM_EXIT_WRITE_CR0),
        [x86_intercept_clts]            = POST_EX(SVM_EXIT_WRITE_CR0),
        [x86_intercept_lmsw]            = POST_EX(SVM_EXIT_WRITE_CR0),
        [x86_intercept_smsw]            = POST_EX(SVM_EXIT_READ_CR0),
        [x86_intercept_dr_read]         = POST_EX(SVM_EXIT_READ_DR0),
        [x86_intercept_dr_write]        = POST_EX(SVM_EXIT_WRITE_DR0),
        [x86_intercept_sldt]            = POST_EX(SVM_EXIT_LDTR_READ),
        [x86_intercept_str]             = POST_EX(SVM_EXIT_TR_READ),
        [x86_intercept_lldt]            = POST_EX(SVM_EXIT_LDTR_WRITE),
        [x86_intercept_ltr]             = POST_EX(SVM_EXIT_TR_WRITE),
        [x86_intercept_sgdt]            = POST_EX(SVM_EXIT_GDTR_READ),
        [x86_intercept_sidt]            = POST_EX(SVM_EXIT_IDTR_READ),
        [x86_intercept_lgdt]            = POST_EX(SVM_EXIT_GDTR_WRITE),
        [x86_intercept_lidt]            = POST_EX(SVM_EXIT_IDTR_WRITE),
        [x86_intercept_vmrun]           = POST_EX(SVM_EXIT_VMRUN),
        [x86_intercept_vmmcall]         = POST_EX(SVM_EXIT_VMMCALL),
        [x86_intercept_vmload]          = POST_EX(SVM_EXIT_VMLOAD),
        [x86_intercept_vmsave]          = POST_EX(SVM_EXIT_VMSAVE),
        [x86_intercept_stgi]            = POST_EX(SVM_EXIT_STGI),
        [x86_intercept_clgi]            = POST_EX(SVM_EXIT_CLGI),
        [x86_intercept_skinit]          = POST_EX(SVM_EXIT_SKINIT),
        [x86_intercept_invlpga]         = POST_EX(SVM_EXIT_INVLPGA),
        [x86_intercept_rdtscp]          = POST_EX(SVM_EXIT_RDTSCP),
        [x86_intercept_monitor]         = POST_MEM(SVM_EXIT_MONITOR),
        [x86_intercept_mwait]           = POST_EX(SVM_EXIT_MWAIT),
        [x86_intercept_invlpg]          = POST_EX(SVM_EXIT_INVLPG),
        [x86_intercept_invd]            = POST_EX(SVM_EXIT_INVD),
        [x86_intercept_wbinvd]          = POST_EX(SVM_EXIT_WBINVD),
        [x86_intercept_wrmsr]           = POST_EX(SVM_EXIT_MSR),
        [x86_intercept_rdtsc]           = POST_EX(SVM_EXIT_RDTSC),
        [x86_intercept_rdmsr]           = POST_EX(SVM_EXIT_MSR),
        [x86_intercept_rdpmc]           = POST_EX(SVM_EXIT_RDPMC),
        [x86_intercept_cpuid]           = PRE_EX(SVM_EXIT_CPUID),
        [x86_intercept_rsm]             = PRE_EX(SVM_EXIT_RSM),
        [x86_intercept_pause]           = PRE_EX(SVM_EXIT_PAUSE),
        [x86_intercept_pushf]           = PRE_EX(SVM_EXIT_PUSHF),
        [x86_intercept_popf]            = PRE_EX(SVM_EXIT_POPF),
        [x86_intercept_intn]            = PRE_EX(SVM_EXIT_SWINT),
        [x86_intercept_iret]            = PRE_EX(SVM_EXIT_IRET),
        [x86_intercept_icebp]           = PRE_EX(SVM_EXIT_ICEBP),
        [x86_intercept_hlt]             = POST_EX(SVM_EXIT_HLT),
        [x86_intercept_in]              = POST_EX(SVM_EXIT_IOIO),
        [x86_intercept_ins]             = POST_EX(SVM_EXIT_IOIO),
        [x86_intercept_out]             = POST_EX(SVM_EXIT_IOIO),
        [x86_intercept_outs]            = POST_EX(SVM_EXIT_IOIO),
};

#undef PRE_EX
#undef POST_EX
#undef POST_MEM

static int svm_check_intercept(struct kvm_vcpu *vcpu,
                               struct x86_instruction_info *info,
                               enum x86_intercept_stage stage)
{
        struct vcpu_svm *svm = to_svm(vcpu);
        int vmexit, ret = X86EMUL_CONTINUE;
        struct __x86_intercept icpt_info;
        struct vmcb *vmcb = svm->vmcb;

        if (info->intercept >= ARRAY_SIZE(x86_intercept_map))
                goto out;

        icpt_info = x86_intercept_map[info->intercept];

        if (stage != icpt_info.stage)
                goto out;

        switch (icpt_info.exit_code) {
        case SVM_EXIT_READ_CR0:
                if (info->intercept == x86_intercept_cr_read)
                        icpt_info.exit_code += info->modrm_reg;
                break;
        case SVM_EXIT_WRITE_CR0: {
                unsigned long cr0, val;
                u64 intercept;

                if (info->intercept == x86_intercept_cr_write)
                        icpt_info.exit_code += info->modrm_reg;

                if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
                    info->intercept == x86_intercept_clts)
                        break;

                intercept = svm->nested.intercept;

                if (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))
                        break;

                cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
                val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;

                if (info->intercept == x86_intercept_lmsw) {
                        cr0 &= 0xfUL;
                        val &= 0xfUL;
                        /* lmsw can't clear PE - catch this here */
                        if (cr0 & X86_CR0_PE)
                                val |= X86_CR0_PE;
                }

                if (cr0 ^ val)
                        icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;

                break;
        }
        case SVM_EXIT_READ_DR0:
        case SVM_EXIT_WRITE_DR0:
                icpt_info.exit_code += info->modrm_reg;
                break;
        case SVM_EXIT_MSR:
                if (info->intercept == x86_intercept_wrmsr)
                        vmcb->control.exit_info_1 = 1;
                else
                        vmcb->control.exit_info_1 = 0;
                break;
        case SVM_EXIT_PAUSE:
                /*
                 * We get this for NOP only, but pause
                 * is rep not, check this here
                 */
                if (info->rep_prefix != REPE_PREFIX)
                        goto out;
        case SVM_EXIT_IOIO: {
                u64 exit_info;
                u32 bytes;

                if (info->intercept == x86_intercept_in ||
                    info->intercept == x86_intercept_ins) {
                        exit_info = ((info->src_val & 0xffff) << 16) |
                                SVM_IOIO_TYPE_MASK;
                        bytes = info->dst_bytes;
                } else {
                        exit_info = (info->dst_val & 0xffff) << 16;
                        bytes = info->src_bytes;
                }

                if (info->intercept == x86_intercept_outs ||
                    info->intercept == x86_intercept_ins)
                        exit_info |= SVM_IOIO_STR_MASK;

                if (info->rep_prefix)
                        exit_info |= SVM_IOIO_REP_MASK;

                bytes = min(bytes, 4u);

                exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;

                exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);

                vmcb->control.exit_info_1 = exit_info;
                vmcb->control.exit_info_2 = info->next_rip;

                break;
        }
        default:
                break;
        }

        vmcb->control.next_rip  = info->next_rip;
        vmcb->control.exit_code = icpt_info.exit_code;
        vmexit = nested_svm_exit_handled(svm);

        ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
                                           : X86EMUL_CONTINUE;

out:
        return ret;
}

static void svm_handle_external_intr(struct kvm_vcpu *vcpu)
{
        local_irq_enable();
}

static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
}

static struct kvm_x86_ops svm_x86_ops = {
        .cpu_has_kvm_support = has_svm,
        .disabled_by_bios = is_disabled,
        .hardware_setup = svm_hardware_setup,
        .hardware_unsetup = svm_hardware_unsetup,
        .check_processor_compatibility = svm_check_processor_compat,
        .hardware_enable = svm_hardware_enable,
        .hardware_disable = svm_hardware_disable,
        .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,

        .vcpu_create = svm_create_vcpu,
        .vcpu_free = svm_free_vcpu,
        .vcpu_reset = svm_vcpu_reset,

        .prepare_guest_switch = svm_prepare_guest_switch,
        .vcpu_load = svm_vcpu_load,
        .vcpu_put = svm_vcpu_put,

        .update_db_bp_intercept = update_db_bp_intercept,
        .get_msr = svm_get_msr,
        .set_msr = svm_set_msr,
        .get_segment_base = svm_get_segment_base,
        .get_segment = svm_get_segment,
        .set_segment = svm_set_segment,
        .get_cpl = svm_get_cpl,
        .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
        .decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
        .decache_cr3 = svm_decache_cr3,
        .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
        .set_cr0 = svm_set_cr0,
        .set_cr3 = svm_set_cr3,
        .set_cr4 = svm_set_cr4,
        .set_efer = svm_set_efer,
        .get_idt = svm_get_idt,
        .set_idt = svm_set_idt,
        .get_gdt = svm_get_gdt,
        .set_gdt = svm_set_gdt,
        .get_dr6 = svm_get_dr6,
        .set_dr6 = svm_set_dr6,
        .set_dr7 = svm_set_dr7,
        .sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
        .cache_reg = svm_cache_reg,
        .get_rflags = svm_get_rflags,
        .set_rflags = svm_set_rflags,
        .fpu_deactivate = svm_fpu_deactivate,

        .tlb_flush = svm_flush_tlb,

        .run = svm_vcpu_run,
        .handle_exit = handle_exit,
        .skip_emulated_instruction = skip_emulated_instruction,
        .set_interrupt_shadow = svm_set_interrupt_shadow,
        .get_interrupt_shadow = svm_get_interrupt_shadow,
        .patch_hypercall = svm_patch_hypercall,
        .set_irq = svm_set_irq,
        .set_nmi = svm_inject_nmi,
        .queue_exception = svm_queue_exception,
        .cancel_injection = svm_cancel_injection,
        .interrupt_allowed = svm_interrupt_allowed,
        .nmi_allowed = svm_nmi_allowed,
        .get_nmi_mask = svm_get_nmi_mask,
        .set_nmi_mask = svm_set_nmi_mask,
        .enable_nmi_window = enable_nmi_window,
        .enable_irq_window = enable_irq_window,
        .update_cr8_intercept = update_cr8_intercept,
        .set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
        .vm_has_apicv = svm_vm_has_apicv,
        .load_eoi_exitmap = svm_load_eoi_exitmap,
        .sync_pir_to_irr = svm_sync_pir_to_irr,

        .set_tss_addr = svm_set_tss_addr,
        .get_tdp_level = get_npt_level,
        .get_mt_mask = svm_get_mt_mask,

        .get_exit_info = svm_get_exit_info,

        .get_lpage_level = svm_get_lpage_level,

        .cpuid_update = svm_cpuid_update,

        .rdtscp_supported = svm_rdtscp_supported,
        .invpcid_supported = svm_invpcid_supported,
        .mpx_supported = svm_mpx_supported,
        .xsaves_supported = svm_xsaves_supported,

        .set_supported_cpuid = svm_set_supported_cpuid,

        .has_wbinvd_exit = svm_has_wbinvd_exit,

        .set_tsc_khz = svm_set_tsc_khz,
        .read_tsc_offset = svm_read_tsc_offset,
        .write_tsc_offset = svm_write_tsc_offset,
        .adjust_tsc_offset = svm_adjust_tsc_offset,
        .compute_tsc_offset = svm_compute_tsc_offset,
        .read_l1_tsc = svm_read_l1_tsc,

        .set_tdp_cr3 = set_tdp_cr3,

        .check_intercept = svm_check_intercept,
        .handle_external_intr = svm_handle_external_intr,

        .sched_in = svm_sched_in,
};

static int __init svm_init(void)
{
        return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
                        __alignof__(struct vcpu_svm), THIS_MODULE);
}

static void __exit svm_exit(void)
{
        kvm_exit();
}

module_init(svm_init)
module_exit(svm_exit)