--- /dev/null
- case KVM_CAP_COALESCED_MMIO:
- r = KVM_COALESCED_MMIO_PAGE_OFFSET;
- break;
+ /*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+ #include <linux/cpu_pm.h>
+ #include <linux/errno.h>
+ #include <linux/err.h>
+ #include <linux/kvm_host.h>
+ #include <linux/list.h>
+ #include <linux/module.h>
+ #include <linux/vmalloc.h>
+ #include <linux/fs.h>
+ #include <linux/mman.h>
+ #include <linux/sched.h>
+ #include <linux/kvm.h>
+ #include <trace/events/kvm.h>
+ #include <kvm/arm_pmu.h>
+
+ #define CREATE_TRACE_POINTS
+ #include "trace.h"
+
+ #include <linux/uaccess.h>
+ #include <asm/ptrace.h>
+ #include <asm/mman.h>
+ #include <asm/tlbflush.h>
+ #include <asm/cacheflush.h>
+ #include <asm/virt.h>
+ #include <asm/kvm_arm.h>
+ #include <asm/kvm_asm.h>
+ #include <asm/kvm_mmu.h>
+ #include <asm/kvm_emulate.h>
+ #include <asm/kvm_coproc.h>
+ #include <asm/kvm_psci.h>
+ #include <asm/sections.h>
+
+ #ifdef REQUIRES_VIRT
+ __asm__(".arch_extension virt");
+ #endif
+
+ static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
+ static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
+
+ /* Per-CPU variable containing the currently running vcpu. */
+ static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
+
+ /* The VMID used in the VTTBR */
+ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
+ static u32 kvm_next_vmid;
+ static unsigned int kvm_vmid_bits __read_mostly;
+ static DEFINE_SPINLOCK(kvm_vmid_lock);
+
+ static bool vgic_present;
+
+ static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
+
+ static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
+ {
+ BUG_ON(preemptible());
+ __this_cpu_write(kvm_arm_running_vcpu, vcpu);
+ }
+
+ /**
+ * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
+ * Must be called from non-preemptible context
+ */
+ struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
+ {
+ BUG_ON(preemptible());
+ return __this_cpu_read(kvm_arm_running_vcpu);
+ }
+
+ /**
+ * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
+ */
+ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
+ {
+ return &kvm_arm_running_vcpu;
+ }
+
+ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+ {
+ return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+ }
+
+ int kvm_arch_hardware_setup(void)
+ {
+ return 0;
+ }
+
+ void kvm_arch_check_processor_compat(void *rtn)
+ {
+ *(int *)rtn = 0;
+ }
+
+
+ /**
+ * kvm_arch_init_vm - initializes a VM data structure
+ * @kvm: pointer to the KVM struct
+ */
+ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+ {
+ int ret, cpu;
+
+ if (type)
+ return -EINVAL;
+
+ kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
+ if (!kvm->arch.last_vcpu_ran)
+ return -ENOMEM;
+
+ for_each_possible_cpu(cpu)
+ *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
+
+ ret = kvm_alloc_stage2_pgd(kvm);
+ if (ret)
+ goto out_fail_alloc;
+
+ ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
+ if (ret)
+ goto out_free_stage2_pgd;
+
+ kvm_vgic_early_init(kvm);
+
+ /* Mark the initial VMID generation invalid */
+ kvm->arch.vmid_gen = 0;
+
+ /* The maximum number of VCPUs is limited by the host's GIC model */
+ kvm->arch.max_vcpus = vgic_present ?
+ kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
+
+ return ret;
+ out_free_stage2_pgd:
+ kvm_free_stage2_pgd(kvm);
+ out_fail_alloc:
+ free_percpu(kvm->arch.last_vcpu_ran);
+ kvm->arch.last_vcpu_ran = NULL;
+ return ret;
+ }
+
+ bool kvm_arch_has_vcpu_debugfs(void)
+ {
+ return false;
+ }
+
+ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+ {
+ return 0;
+ }
+
+ int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+ {
+ return VM_FAULT_SIGBUS;
+ }
+
+
+ /**
+ * kvm_arch_destroy_vm - destroy the VM data structure
+ * @kvm: pointer to the KVM struct
+ */
+ void kvm_arch_destroy_vm(struct kvm *kvm)
+ {
+ int i;
+
+ free_percpu(kvm->arch.last_vcpu_ran);
+ kvm->arch.last_vcpu_ran = NULL;
+
+ for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+ if (kvm->vcpus[i]) {
+ kvm_arch_vcpu_free(kvm->vcpus[i]);
+ kvm->vcpus[i] = NULL;
+ }
+ }
+
+ kvm_vgic_destroy(kvm);
+ }
+
+ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
+ {
+ int r;
+ switch (ext) {
+ case KVM_CAP_IRQCHIP:
+ r = vgic_present;
+ break;
+ case KVM_CAP_IOEVENTFD:
+ case KVM_CAP_DEVICE_CTRL:
+ case KVM_CAP_USER_MEMORY:
+ case KVM_CAP_SYNC_MMU:
+ case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+ case KVM_CAP_ONE_REG:
+ case KVM_CAP_ARM_PSCI:
+ case KVM_CAP_ARM_PSCI_0_2:
+ case KVM_CAP_READONLY_MEM:
+ case KVM_CAP_MP_STATE:
+ case KVM_CAP_IMMEDIATE_EXIT:
+ r = 1;
+ break;
+ case KVM_CAP_ARM_SET_DEVICE_ADDR:
+ r = 1;
+ break;
+ case KVM_CAP_NR_VCPUS:
+ r = num_online_cpus();
+ break;
+ case KVM_CAP_MAX_VCPUS:
+ r = KVM_MAX_VCPUS;
+ break;
+ case KVM_CAP_NR_MEMSLOTS:
+ r = KVM_USER_MEM_SLOTS;
+ break;
+ case KVM_CAP_MSI_DEVID:
+ if (!kvm)
+ r = -EINVAL;
+ else
+ r = kvm->arch.vgic.msis_require_devid;
+ break;
+ case KVM_CAP_ARM_USER_IRQ:
+ /*
+ * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
+ * (bump this number if adding more devices)
+ */
+ r = 1;
+ break;
+ default:
+ r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
+ break;
+ }
+ return r;
+ }
+
+ long kvm_arch_dev_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+ {
+ return -EINVAL;
+ }
+
+
+ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+ {
+ int err;
+ struct kvm_vcpu *vcpu;
+
+ if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (id >= kvm->arch.max_vcpus) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+ if (!vcpu) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = kvm_vcpu_init(vcpu, kvm, id);
+ if (err)
+ goto free_vcpu;
+
+ err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
+ if (err)
+ goto vcpu_uninit;
+
+ return vcpu;
+ vcpu_uninit:
+ kvm_vcpu_uninit(vcpu);
+ free_vcpu:
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+ out:
+ return ERR_PTR(err);
+ }
+
+ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+ {
+ kvm_vgic_vcpu_early_init(vcpu);
+ }
+
+ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+ {
+ kvm_mmu_free_memory_caches(vcpu);
+ kvm_timer_vcpu_terminate(vcpu);
+ kvm_vgic_vcpu_destroy(vcpu);
+ kvm_pmu_vcpu_destroy(vcpu);
+ kvm_vcpu_uninit(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+ }
+
+ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+ {
+ kvm_arch_vcpu_free(vcpu);
+ }
+
+ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+ {
+ return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
+ kvm_timer_should_fire(vcpu_ptimer(vcpu));
+ }
+
+ void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
+ {
+ kvm_timer_schedule(vcpu);
+ }
+
+ void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
+ {
+ kvm_timer_unschedule(vcpu);
+ }
+
+ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+ {
+ /* Force users to call KVM_ARM_VCPU_INIT */
+ vcpu->arch.target = -1;
+ bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+ /* Set up the timer */
+ kvm_timer_vcpu_init(vcpu);
+
+ kvm_arm_reset_debug_ptr(vcpu);
+
+ return kvm_vgic_vcpu_init(vcpu);
+ }
+
+ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+ {
+ int *last_ran;
+
+ last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
+
+ /*
+ * We might get preempted before the vCPU actually runs, but
+ * over-invalidation doesn't affect correctness.
+ */
+ if (*last_ran != vcpu->vcpu_id) {
+ kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
+ *last_ran = vcpu->vcpu_id;
+ }
+
+ vcpu->cpu = cpu;
+ vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
+
+ kvm_arm_set_running_vcpu(vcpu);
+
+ kvm_vgic_load(vcpu);
+ }
+
+ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+ {
+ kvm_vgic_put(vcpu);
+
+ vcpu->cpu = -1;
+
+ kvm_arm_set_running_vcpu(NULL);
+ kvm_timer_vcpu_put(vcpu);
+ }
+
+ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+ {
+ if (vcpu->arch.power_off)
+ mp_state->mp_state = KVM_MP_STATE_STOPPED;
+ else
+ mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
+
+ return 0;
+ }
+
+ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+ {
+ switch (mp_state->mp_state) {
+ case KVM_MP_STATE_RUNNABLE:
+ vcpu->arch.power_off = false;
+ break;
+ case KVM_MP_STATE_STOPPED:
+ vcpu->arch.power_off = true;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ /**
+ * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
+ * @v: The VCPU pointer
+ *
+ * If the guest CPU is not waiting for interrupts or an interrupt line is
+ * asserted, the CPU is by definition runnable.
+ */
+ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
+ {
+ return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
+ && !v->arch.power_off && !v->arch.pause);
+ }
+
+ /* Just ensure a guest exit from a particular CPU */
+ static void exit_vm_noop(void *info)
+ {
+ }
+
+ void force_vm_exit(const cpumask_t *mask)
+ {
+ preempt_disable();
+ smp_call_function_many(mask, exit_vm_noop, NULL, true);
+ preempt_enable();
+ }
+
+ /**
+ * need_new_vmid_gen - check that the VMID is still valid
+ * @kvm: The VM's VMID to check
+ *
+ * return true if there is a new generation of VMIDs being used
+ *
+ * The hardware supports only 256 values with the value zero reserved for the
+ * host, so we check if an assigned value belongs to a previous generation,
+ * which which requires us to assign a new value. If we're the first to use a
+ * VMID for the new generation, we must flush necessary caches and TLBs on all
+ * CPUs.
+ */
+ static bool need_new_vmid_gen(struct kvm *kvm)
+ {
+ return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
+ }
+
+ /**
+ * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
+ * @kvm The guest that we are about to run
+ *
+ * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
+ * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
+ * caches and TLBs.
+ */
+ static void update_vttbr(struct kvm *kvm)
+ {
+ phys_addr_t pgd_phys;
+ u64 vmid;
+
+ if (!need_new_vmid_gen(kvm))
+ return;
+
+ spin_lock(&kvm_vmid_lock);
+
+ /*
+ * We need to re-check the vmid_gen here to ensure that if another vcpu
+ * already allocated a valid vmid for this vm, then this vcpu should
+ * use the same vmid.
+ */
+ if (!need_new_vmid_gen(kvm)) {
+ spin_unlock(&kvm_vmid_lock);
+ return;
+ }
+
+ /* First user of a new VMID generation? */
+ if (unlikely(kvm_next_vmid == 0)) {
+ atomic64_inc(&kvm_vmid_gen);
+ kvm_next_vmid = 1;
+
+ /*
+ * On SMP we know no other CPUs can use this CPU's or each
+ * other's VMID after force_vm_exit returns since the
+ * kvm_vmid_lock blocks them from reentry to the guest.
+ */
+ force_vm_exit(cpu_all_mask);
+ /*
+ * Now broadcast TLB + ICACHE invalidation over the inner
+ * shareable domain to make sure all data structures are
+ * clean.
+ */
+ kvm_call_hyp(__kvm_flush_vm_context);
+ }
+
+ kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
+ kvm->arch.vmid = kvm_next_vmid;
+ kvm_next_vmid++;
+ kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
+
+ /* update vttbr to be used with the new vmid */
+ pgd_phys = virt_to_phys(kvm->arch.pgd);
+ BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
+ vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
+ kvm->arch.vttbr = pgd_phys | vmid;
+
+ spin_unlock(&kvm_vmid_lock);
+ }
+
+ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
+ {
+ struct kvm *kvm = vcpu->kvm;
+ int ret = 0;
+
+ if (likely(vcpu->arch.has_run_once))
+ return 0;
+
+ vcpu->arch.has_run_once = true;
+
+ /*
+ * Map the VGIC hardware resources before running a vcpu the first
+ * time on this VM.
+ */
+ if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
+ ret = kvm_vgic_map_resources(kvm);
+ if (ret)
+ return ret;
+ }
+
+ ret = kvm_timer_enable(vcpu);
+
+ return ret;
+ }
+
+ bool kvm_arch_intc_initialized(struct kvm *kvm)
+ {
+ return vgic_initialized(kvm);
+ }
+
+ void kvm_arm_halt_guest(struct kvm *kvm)
+ {
+ int i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ vcpu->arch.pause = true;
+ kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
+ }
+
+ void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
+ {
+ vcpu->arch.pause = true;
+ kvm_vcpu_kick(vcpu);
+ }
+
+ void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
+ {
+ struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+ vcpu->arch.pause = false;
+ swake_up(wq);
+ }
+
+ void kvm_arm_resume_guest(struct kvm *kvm)
+ {
+ int i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ kvm_arm_resume_vcpu(vcpu);
+ }
+
+ static void vcpu_sleep(struct kvm_vcpu *vcpu)
+ {
+ struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+ swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
+ (!vcpu->arch.pause)));
+ }
+
+ static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
+ {
+ return vcpu->arch.target >= 0;
+ }
+
+ /**
+ * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
+ * @vcpu: The VCPU pointer
+ * @run: The kvm_run structure pointer used for userspace state exchange
+ *
+ * This function is called through the VCPU_RUN ioctl called from user space. It
+ * will execute VM code in a loop until the time slice for the process is used
+ * or some emulation is needed from user space in which case the function will
+ * return with return value 0 and with the kvm_run structure filled in with the
+ * required data for the requested emulation.
+ */
+ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
+ {
+ int ret;
+ sigset_t sigsaved;
+
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
+ ret = kvm_vcpu_first_run_init(vcpu);
+ if (ret)
+ return ret;
+
+ if (run->exit_reason == KVM_EXIT_MMIO) {
+ ret = kvm_handle_mmio_return(vcpu, vcpu->run);
+ if (ret)
+ return ret;
+ }
+
+ if (run->immediate_exit)
+ return -EINTR;
+
+ if (vcpu->sigset_active)
+ sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
+
+ ret = 1;
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ while (ret > 0) {
+ /*
+ * Check conditions before entering the guest
+ */
+ cond_resched();
+
+ update_vttbr(vcpu->kvm);
+
+ if (vcpu->arch.power_off || vcpu->arch.pause)
+ vcpu_sleep(vcpu);
+
+ /*
+ * Preparing the interrupts to be injected also
+ * involves poking the GIC, which must be done in a
+ * non-preemptible context.
+ */
+ preempt_disable();
+
+ kvm_pmu_flush_hwstate(vcpu);
+
+ kvm_timer_flush_hwstate(vcpu);
+ kvm_vgic_flush_hwstate(vcpu);
+
+ local_irq_disable();
+
+ /*
+ * If we have a singal pending, or need to notify a userspace
+ * irqchip about timer or PMU level changes, then we exit (and
+ * update the timer level state in kvm_timer_update_run
+ * below).
+ */
+ if (signal_pending(current) ||
+ kvm_timer_should_notify_user(vcpu) ||
+ kvm_pmu_should_notify_user(vcpu)) {
+ ret = -EINTR;
+ run->exit_reason = KVM_EXIT_INTR;
+ }
+
+ if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
+ vcpu->arch.power_off || vcpu->arch.pause) {
+ local_irq_enable();
+ kvm_pmu_sync_hwstate(vcpu);
+ kvm_timer_sync_hwstate(vcpu);
+ kvm_vgic_sync_hwstate(vcpu);
+ preempt_enable();
+ continue;
+ }
+
+ kvm_arm_setup_debug(vcpu);
+
+ /**************************************************************
+ * Enter the guest
+ */
+ trace_kvm_entry(*vcpu_pc(vcpu));
+ guest_enter_irqoff();
+ vcpu->mode = IN_GUEST_MODE;
+
+ ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
+
+ vcpu->mode = OUTSIDE_GUEST_MODE;
+ vcpu->stat.exits++;
+ /*
+ * Back from guest
+ *************************************************************/
+
+ kvm_arm_clear_debug(vcpu);
+
+ /*
+ * We may have taken a host interrupt in HYP mode (ie
+ * while executing the guest). This interrupt is still
+ * pending, as we haven't serviced it yet!
+ *
+ * We're now back in SVC mode, with interrupts
+ * disabled. Enabling the interrupts now will have
+ * the effect of taking the interrupt again, in SVC
+ * mode this time.
+ */
+ local_irq_enable();
+
+ /*
+ * We do local_irq_enable() before calling guest_exit() so
+ * that if a timer interrupt hits while running the guest we
+ * account that tick as being spent in the guest. We enable
+ * preemption after calling guest_exit() so that if we get
+ * preempted we make sure ticks after that is not counted as
+ * guest time.
+ */
+ guest_exit();
+ trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
+
+ /*
+ * We must sync the PMU and timer state before the vgic state so
+ * that the vgic can properly sample the updated state of the
+ * interrupt line.
+ */
+ kvm_pmu_sync_hwstate(vcpu);
+ kvm_timer_sync_hwstate(vcpu);
+
+ kvm_vgic_sync_hwstate(vcpu);
+
+ preempt_enable();
+
+ ret = handle_exit(vcpu, run, ret);
+ }
+
+ /* Tell userspace about in-kernel device output levels */
+ if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
+ kvm_timer_update_run(vcpu);
+ kvm_pmu_update_run(vcpu);
+ }
+
+ if (vcpu->sigset_active)
+ sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+ return ret;
+ }
+
+ static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
+ {
+ int bit_index;
+ bool set;
+ unsigned long *ptr;
+
+ if (number == KVM_ARM_IRQ_CPU_IRQ)
+ bit_index = __ffs(HCR_VI);
+ else /* KVM_ARM_IRQ_CPU_FIQ */
+ bit_index = __ffs(HCR_VF);
+
+ ptr = (unsigned long *)&vcpu->arch.irq_lines;
+ if (level)
+ set = test_and_set_bit(bit_index, ptr);
+ else
+ set = test_and_clear_bit(bit_index, ptr);
+
+ /*
+ * If we didn't change anything, no need to wake up or kick other CPUs
+ */
+ if (set == level)
+ return 0;
+
+ /*
+ * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
+ * trigger a world-switch round on the running physical CPU to set the
+ * virtual IRQ/FIQ fields in the HCR appropriately.
+ */
+ kvm_vcpu_kick(vcpu);
+
+ return 0;
+ }
+
+ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
+ bool line_status)
+ {
+ u32 irq = irq_level->irq;
+ unsigned int irq_type, vcpu_idx, irq_num;
+ int nrcpus = atomic_read(&kvm->online_vcpus);
+ struct kvm_vcpu *vcpu = NULL;
+ bool level = irq_level->level;
+
+ irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
+ vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
+ irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
+
+ trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
+
+ switch (irq_type) {
+ case KVM_ARM_IRQ_TYPE_CPU:
+ if (irqchip_in_kernel(kvm))
+ return -ENXIO;
+
+ if (vcpu_idx >= nrcpus)
+ return -EINVAL;
+
+ vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+ if (!vcpu)
+ return -EINVAL;
+
+ if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
+ return -EINVAL;
+
+ return vcpu_interrupt_line(vcpu, irq_num, level);
+ case KVM_ARM_IRQ_TYPE_PPI:
+ if (!irqchip_in_kernel(kvm))
+ return -ENXIO;
+
+ if (vcpu_idx >= nrcpus)
+ return -EINVAL;
+
+ vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+ if (!vcpu)
+ return -EINVAL;
+
+ if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
+ return -EINVAL;
+
+ return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
+ case KVM_ARM_IRQ_TYPE_SPI:
+ if (!irqchip_in_kernel(kvm))
+ return -ENXIO;
+
+ if (irq_num < VGIC_NR_PRIVATE_IRQS)
+ return -EINVAL;
+
+ return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
+ }
+
+ return -EINVAL;
+ }
+
+ static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+ const struct kvm_vcpu_init *init)
+ {
+ unsigned int i;
+ int phys_target = kvm_target_cpu();
+
+ if (init->target != phys_target)
+ return -EINVAL;
+
+ /*
+ * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+ * use the same target.
+ */
+ if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
+ return -EINVAL;
+
+ /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
+ for (i = 0; i < sizeof(init->features) * 8; i++) {
+ bool set = (init->features[i / 32] & (1 << (i % 32)));
+
+ if (set && i >= KVM_VCPU_MAX_FEATURES)
+ return -ENOENT;
+
+ /*
+ * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+ * use the same feature set.
+ */
+ if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
+ test_bit(i, vcpu->arch.features) != set)
+ return -EINVAL;
+
+ if (set)
+ set_bit(i, vcpu->arch.features);
+ }
+
+ vcpu->arch.target = phys_target;
+
+ /* Now we know what it is, we can reset it. */
+ return kvm_reset_vcpu(vcpu);
+ }
+
+
+ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
+ struct kvm_vcpu_init *init)
+ {
+ int ret;
+
+ ret = kvm_vcpu_set_target(vcpu, init);
+ if (ret)
+ return ret;
+
+ /*
+ * Ensure a rebooted VM will fault in RAM pages and detect if the
+ * guest MMU is turned off and flush the caches as needed.
+ */
+ if (vcpu->arch.has_run_once)
+ stage2_unmap_vm(vcpu->kvm);
+
+ vcpu_reset_hcr(vcpu);
+
+ /*
+ * Handle the "start in power-off" case.
+ */
+ if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
+ vcpu->arch.power_off = true;
+ else
+ vcpu->arch.power_off = false;
+
+ return 0;
+ }
+
+ static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+ {
+ int ret = -ENXIO;
+
+ switch (attr->group) {
+ default:
+ ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
+ break;
+ }
+
+ return ret;
+ }
+
+ static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+ {
+ int ret = -ENXIO;
+
+ switch (attr->group) {
+ default:
+ ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
+ break;
+ }
+
+ return ret;
+ }
+
+ static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+ {
+ int ret = -ENXIO;
+
+ switch (attr->group) {
+ default:
+ ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
+ break;
+ }
+
+ return ret;
+ }
+
+ long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+ {
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ struct kvm_device_attr attr;
+
+ switch (ioctl) {
+ case KVM_ARM_VCPU_INIT: {
+ struct kvm_vcpu_init init;
+
+ if (copy_from_user(&init, argp, sizeof(init)))
+ return -EFAULT;
+
+ return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
+ }
+ case KVM_SET_ONE_REG:
+ case KVM_GET_ONE_REG: {
+ struct kvm_one_reg reg;
+
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
+ if (copy_from_user(®, argp, sizeof(reg)))
+ return -EFAULT;
+ if (ioctl == KVM_SET_ONE_REG)
+ return kvm_arm_set_reg(vcpu, ®);
+ else
+ return kvm_arm_get_reg(vcpu, ®);
+ }
+ case KVM_GET_REG_LIST: {
+ struct kvm_reg_list __user *user_list = argp;
+ struct kvm_reg_list reg_list;
+ unsigned n;
+
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
+ if (copy_from_user(®_list, user_list, sizeof(reg_list)))
+ return -EFAULT;
+ n = reg_list.n;
+ reg_list.n = kvm_arm_num_regs(vcpu);
+ if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
+ return -EFAULT;
+ if (n < reg_list.n)
+ return -E2BIG;
+ return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
+ }
+ case KVM_SET_DEVICE_ATTR: {
+ if (copy_from_user(&attr, argp, sizeof(attr)))
+ return -EFAULT;
+ return kvm_arm_vcpu_set_attr(vcpu, &attr);
+ }
+ case KVM_GET_DEVICE_ATTR: {
+ if (copy_from_user(&attr, argp, sizeof(attr)))
+ return -EFAULT;
+ return kvm_arm_vcpu_get_attr(vcpu, &attr);
+ }
+ case KVM_HAS_DEVICE_ATTR: {
+ if (copy_from_user(&attr, argp, sizeof(attr)))
+ return -EFAULT;
+ return kvm_arm_vcpu_has_attr(vcpu, &attr);
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+
+ /**
+ * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
+ * @kvm: kvm instance
+ * @log: slot id and address to which we copy the log
+ *
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
+ *
+ * 1. Take a snapshot of the bit and clear it if needed.
+ * 2. Write protect the corresponding page.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Flush TLB's if needed.
+ */
+ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+ {
+ bool is_dirty = false;
+ int r;
+
+ mutex_lock(&kvm->slots_lock);
+
+ r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
+
+ if (is_dirty)
+ kvm_flush_remote_tlbs(kvm);
+
+ mutex_unlock(&kvm->slots_lock);
+ return r;
+ }
+
+ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
+ struct kvm_arm_device_addr *dev_addr)
+ {
+ unsigned long dev_id, type;
+
+ dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
+ KVM_ARM_DEVICE_ID_SHIFT;
+ type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
+ KVM_ARM_DEVICE_TYPE_SHIFT;
+
+ switch (dev_id) {
+ case KVM_ARM_DEVICE_VGIC_V2:
+ if (!vgic_present)
+ return -ENXIO;
+ return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
+ default:
+ return -ENODEV;
+ }
+ }
+
+ long kvm_arch_vm_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+ {
+ struct kvm *kvm = filp->private_data;
+ void __user *argp = (void __user *)arg;
+
+ switch (ioctl) {
+ case KVM_CREATE_IRQCHIP: {
+ int ret;
+ if (!vgic_present)
+ return -ENXIO;
+ mutex_lock(&kvm->lock);
+ ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+ mutex_unlock(&kvm->lock);
+ return ret;
+ }
+ case KVM_ARM_SET_DEVICE_ADDR: {
+ struct kvm_arm_device_addr dev_addr;
+
+ if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
+ return -EFAULT;
+ return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
+ }
+ case KVM_ARM_PREFERRED_TARGET: {
+ int err;
+ struct kvm_vcpu_init init;
+
+ err = kvm_vcpu_preferred_target(&init);
+ if (err)
+ return err;
+
+ if (copy_to_user(argp, &init, sizeof(init)))
+ return -EFAULT;
+
+ return 0;
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+
+ static void cpu_init_hyp_mode(void *dummy)
+ {
+ phys_addr_t pgd_ptr;
+ unsigned long hyp_stack_ptr;
+ unsigned long stack_page;
+ unsigned long vector_ptr;
+
+ /* Switch from the HYP stub to our own HYP init vector */
+ __hyp_set_vectors(kvm_get_idmap_vector());
+
+ pgd_ptr = kvm_mmu_get_httbr();
+ stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
+ hyp_stack_ptr = stack_page + PAGE_SIZE;
+ vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
+
+ __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
+ __cpu_init_stage2();
+
+ if (is_kernel_in_hyp_mode())
+ kvm_timer_init_vhe();
+
+ kvm_arm_init_debug();
+ }
+
+ static void cpu_hyp_reset(void)
+ {
+ if (!is_kernel_in_hyp_mode())
+ __hyp_reset_vectors();
+ }
+
+ static void cpu_hyp_reinit(void)
+ {
+ cpu_hyp_reset();
+
+ if (is_kernel_in_hyp_mode()) {
+ /*
+ * __cpu_init_stage2() is safe to call even if the PM
+ * event was cancelled before the CPU was reset.
+ */
+ __cpu_init_stage2();
+ } else {
+ cpu_init_hyp_mode(NULL);
+ }
++
++ if (vgic_present)
++ kvm_vgic_init_cpu_hardware();
+ }
+
+ static void _kvm_arch_hardware_enable(void *discard)
+ {
+ if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
+ cpu_hyp_reinit();
+ __this_cpu_write(kvm_arm_hardware_enabled, 1);
+ }
+ }
+
+ int kvm_arch_hardware_enable(void)
+ {
+ _kvm_arch_hardware_enable(NULL);
+ return 0;
+ }
+
+ static void _kvm_arch_hardware_disable(void *discard)
+ {
+ if (__this_cpu_read(kvm_arm_hardware_enabled)) {
+ cpu_hyp_reset();
+ __this_cpu_write(kvm_arm_hardware_enabled, 0);
+ }
+ }
+
+ void kvm_arch_hardware_disable(void)
+ {
+ _kvm_arch_hardware_disable(NULL);
+ }
+
+ #ifdef CONFIG_CPU_PM
+ static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
+ unsigned long cmd,
+ void *v)
+ {
+ /*
+ * kvm_arm_hardware_enabled is left with its old value over
+ * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
+ * re-enable hyp.
+ */
+ switch (cmd) {
+ case CPU_PM_ENTER:
+ if (__this_cpu_read(kvm_arm_hardware_enabled))
+ /*
+ * don't update kvm_arm_hardware_enabled here
+ * so that the hardware will be re-enabled
+ * when we resume. See below.
+ */
+ cpu_hyp_reset();
+
+ return NOTIFY_OK;
+ case CPU_PM_EXIT:
+ if (__this_cpu_read(kvm_arm_hardware_enabled))
+ /* The hardware was enabled before suspend. */
+ cpu_hyp_reinit();
+
+ return NOTIFY_OK;
+
+ default:
+ return NOTIFY_DONE;
+ }
+ }
+
+ static struct notifier_block hyp_init_cpu_pm_nb = {
+ .notifier_call = hyp_init_cpu_pm_notifier,
+ };
+
+ static void __init hyp_cpu_pm_init(void)
+ {
+ cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
+ }
+ static void __init hyp_cpu_pm_exit(void)
+ {
+ cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
+ }
+ #else
+ static inline void hyp_cpu_pm_init(void)
+ {
+ }
+ static inline void hyp_cpu_pm_exit(void)
+ {
+ }
+ #endif
+
+ static void teardown_common_resources(void)
+ {
+ free_percpu(kvm_host_cpu_state);
+ }
+
+ static int init_common_resources(void)
+ {
+ kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
+ if (!kvm_host_cpu_state) {
+ kvm_err("Cannot allocate host CPU state\n");
+ return -ENOMEM;
+ }
+
+ /* set size of VMID supported by CPU */
+ kvm_vmid_bits = kvm_get_vmid_bits();
+ kvm_info("%d-bit VMID\n", kvm_vmid_bits);
+
+ return 0;
+ }
+
+ static int init_subsystems(void)
+ {
+ int err = 0;
+
+ /*
+ * Enable hardware so that subsystem initialisation can access EL2.
+ */
+ on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
+
+ /*
+ * Register CPU lower-power notifier
+ */
+ hyp_cpu_pm_init();
+
+ /*
+ * Init HYP view of VGIC
+ */
+ err = kvm_vgic_hyp_init();
+ switch (err) {
+ case 0:
+ vgic_present = true;
+ break;
+ case -ENODEV:
+ case -ENXIO:
+ vgic_present = false;
+ err = 0;
+ break;
+ default:
+ goto out;
+ }
+
+ /*
+ * Init HYP architected timer support
+ */
+ err = kvm_timer_hyp_init();
+ if (err)
+ goto out;
+
+ kvm_perf_init();
+ kvm_coproc_table_init();
+
+ out:
+ on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
+
+ return err;
+ }
+
+ static void teardown_hyp_mode(void)
+ {
+ int cpu;
+
+ if (is_kernel_in_hyp_mode())
+ return;
+
+ free_hyp_pgds();
+ for_each_possible_cpu(cpu)
+ free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+ hyp_cpu_pm_exit();
+ }
+
+ static int init_vhe_mode(void)
+ {
+ kvm_info("VHE mode initialized successfully\n");
+ return 0;
+ }
+
+ /**
+ * Inits Hyp-mode on all online CPUs
+ */
+ static int init_hyp_mode(void)
+ {
+ int cpu;
+ int err = 0;
+
+ /*
+ * Allocate Hyp PGD and setup Hyp identity mapping
+ */
+ err = kvm_mmu_init();
+ if (err)
+ goto out_err;
+
+ /*
+ * Allocate stack pages for Hypervisor-mode
+ */
+ for_each_possible_cpu(cpu) {
+ unsigned long stack_page;
+
+ stack_page = __get_free_page(GFP_KERNEL);
+ if (!stack_page) {
+ err = -ENOMEM;
+ goto out_err;
+ }
+
+ per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
+ }
+
+ /*
+ * Map the Hyp-code called directly from the host
+ */
+ err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
+ kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
+ if (err) {
+ kvm_err("Cannot map world-switch code\n");
+ goto out_err;
+ }
+
+ err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
+ kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
+ if (err) {
+ kvm_err("Cannot map rodata section\n");
+ goto out_err;
+ }
+
+ err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
+ kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
+ if (err) {
+ kvm_err("Cannot map bss section\n");
+ goto out_err;
+ }
+
+ /*
+ * Map the Hyp stack pages
+ */
+ for_each_possible_cpu(cpu) {
+ char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
+ err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
+ PAGE_HYP);
+
+ if (err) {
+ kvm_err("Cannot map hyp stack\n");
+ goto out_err;
+ }
+ }
+
+ for_each_possible_cpu(cpu) {
+ kvm_cpu_context_t *cpu_ctxt;
+
+ cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
+ err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
+
+ if (err) {
+ kvm_err("Cannot map host CPU state: %d\n", err);
+ goto out_err;
+ }
+ }
+
+ kvm_info("Hyp mode initialized successfully\n");
+
+ return 0;
+
+ out_err:
+ teardown_hyp_mode();
+ kvm_err("error initializing Hyp mode: %d\n", err);
+ return err;
+ }
+
+ static void check_kvm_target_cpu(void *ret)
+ {
+ *(int *)ret = kvm_target_cpu();
+ }
+
+ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+ {
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ mpidr &= MPIDR_HWID_BITMASK;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+ return vcpu;
+ }
+ return NULL;
+ }
+
+ /**
+ * Initialize Hyp-mode and memory mappings on all CPUs.
+ */
+ int kvm_arch_init(void *opaque)
+ {
+ int err;
+ int ret, cpu;
+
+ if (!is_hyp_mode_available()) {
+ kvm_err("HYP mode not available\n");
+ return -ENODEV;
+ }
+
+ for_each_online_cpu(cpu) {
+ smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
+ if (ret < 0) {
+ kvm_err("Error, CPU %d not supported!\n", cpu);
+ return -ENODEV;
+ }
+ }
+
+ err = init_common_resources();
+ if (err)
+ return err;
+
+ if (is_kernel_in_hyp_mode())
+ err = init_vhe_mode();
+ else
+ err = init_hyp_mode();
+ if (err)
+ goto out_err;
+
+ err = init_subsystems();
+ if (err)
+ goto out_hyp;
+
+ return 0;
+
+ out_hyp:
+ teardown_hyp_mode();
+ out_err:
+ teardown_common_resources();
+ return err;
+ }
+
+ /* NOP: Compiling as a module not supported */
+ void kvm_arch_exit(void)
+ {
+ kvm_perf_teardown();
+ }
+
+ static int arm_init(void)
+ {
+ int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+ return rc;
+ }
+
+ module_init(arm_init);
--- /dev/null
- if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES)
- return -EINVAL;
+ /*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+ #include <linux/mman.h>
+ #include <linux/kvm_host.h>
+ #include <linux/io.h>
+ #include <linux/hugetlb.h>
+ #include <trace/events/kvm.h>
+ #include <asm/pgalloc.h>
+ #include <asm/cacheflush.h>
+ #include <asm/kvm_arm.h>
+ #include <asm/kvm_mmu.h>
+ #include <asm/kvm_mmio.h>
+ #include <asm/kvm_asm.h>
+ #include <asm/kvm_emulate.h>
+ #include <asm/virt.h>
+
+ #include "trace.h"
+
+ static pgd_t *boot_hyp_pgd;
+ static pgd_t *hyp_pgd;
+ static pgd_t *merged_hyp_pgd;
+ static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
+
+ static unsigned long hyp_idmap_start;
+ static unsigned long hyp_idmap_end;
+ static phys_addr_t hyp_idmap_vector;
+
+ #define S2_PGD_SIZE (PTRS_PER_S2_PGD * sizeof(pgd_t))
+ #define hyp_pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
+
+ #define KVM_S2PTE_FLAG_IS_IOMAP (1UL << 0)
+ #define KVM_S2_FLAG_LOGGING_ACTIVE (1UL << 1)
+
+ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
+ {
+ return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY);
+ }
+
+ /**
+ * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8
+ * @kvm: pointer to kvm structure.
+ *
+ * Interface to HYP function to flush all VM TLB entries
+ */
+ void kvm_flush_remote_tlbs(struct kvm *kvm)
+ {
+ kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
+ }
+
+ static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
+ {
+ kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
+ }
+
+ /*
+ * D-Cache management functions. They take the page table entries by
+ * value, as they are flushing the cache using the kernel mapping (or
+ * kmap on 32bit).
+ */
+ static void kvm_flush_dcache_pte(pte_t pte)
+ {
+ __kvm_flush_dcache_pte(pte);
+ }
+
+ static void kvm_flush_dcache_pmd(pmd_t pmd)
+ {
+ __kvm_flush_dcache_pmd(pmd);
+ }
+
+ static void kvm_flush_dcache_pud(pud_t pud)
+ {
+ __kvm_flush_dcache_pud(pud);
+ }
+
+ static bool kvm_is_device_pfn(unsigned long pfn)
+ {
+ return !pfn_valid(pfn);
+ }
+
+ /**
+ * stage2_dissolve_pmd() - clear and flush huge PMD entry
+ * @kvm: pointer to kvm structure.
+ * @addr: IPA
+ * @pmd: pmd pointer for IPA
+ *
+ * Function clears a PMD entry, flushes addr 1st and 2nd stage TLBs. Marks all
+ * pages in the range dirty.
+ */
+ static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd)
+ {
+ if (!pmd_thp_or_huge(*pmd))
+ return;
+
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ put_page(virt_to_page(pmd));
+ }
+
+ static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
+ int min, int max)
+ {
+ void *page;
+
+ BUG_ON(max > KVM_NR_MEM_OBJS);
+ if (cache->nobjs >= min)
+ return 0;
+ while (cache->nobjs < max) {
+ page = (void *)__get_free_page(PGALLOC_GFP);
+ if (!page)
+ return -ENOMEM;
+ cache->objects[cache->nobjs++] = page;
+ }
+ return 0;
+ }
+
+ static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
+ {
+ while (mc->nobjs)
+ free_page((unsigned long)mc->objects[--mc->nobjs]);
+ }
+
+ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
+ {
+ void *p;
+
+ BUG_ON(!mc || !mc->nobjs);
+ p = mc->objects[--mc->nobjs];
+ return p;
+ }
+
+ static void clear_stage2_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr)
+ {
+ pud_t *pud_table __maybe_unused = stage2_pud_offset(pgd, 0UL);
+ stage2_pgd_clear(pgd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ stage2_pud_free(pud_table);
+ put_page(virt_to_page(pgd));
+ }
+
+ static void clear_stage2_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr)
+ {
+ pmd_t *pmd_table __maybe_unused = stage2_pmd_offset(pud, 0);
+ VM_BUG_ON(stage2_pud_huge(*pud));
+ stage2_pud_clear(pud);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ stage2_pmd_free(pmd_table);
+ put_page(virt_to_page(pud));
+ }
+
+ static void clear_stage2_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr)
+ {
+ pte_t *pte_table = pte_offset_kernel(pmd, 0);
+ VM_BUG_ON(pmd_thp_or_huge(*pmd));
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ pte_free_kernel(NULL, pte_table);
+ put_page(virt_to_page(pmd));
+ }
+
+ /*
+ * Unmapping vs dcache management:
+ *
+ * If a guest maps certain memory pages as uncached, all writes will
+ * bypass the data cache and go directly to RAM. However, the CPUs
+ * can still speculate reads (not writes) and fill cache lines with
+ * data.
+ *
+ * Those cache lines will be *clean* cache lines though, so a
+ * clean+invalidate operation is equivalent to an invalidate
+ * operation, because no cache lines are marked dirty.
+ *
+ * Those clean cache lines could be filled prior to an uncached write
+ * by the guest, and the cache coherent IO subsystem would therefore
+ * end up writing old data to disk.
+ *
+ * This is why right after unmapping a page/section and invalidating
+ * the corresponding TLBs, we call kvm_flush_dcache_p*() to make sure
+ * the IO subsystem will never hit in the cache.
+ */
+ static void unmap_stage2_ptes(struct kvm *kvm, pmd_t *pmd,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ phys_addr_t start_addr = addr;
+ pte_t *pte, *start_pte;
+
+ start_pte = pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ pte_t old_pte = *pte;
+
+ kvm_set_pte(pte, __pte(0));
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+
+ /* No need to invalidate the cache for device mappings */
+ if (!kvm_is_device_pfn(pte_pfn(old_pte)))
+ kvm_flush_dcache_pte(old_pte);
+
+ put_page(virt_to_page(pte));
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+
+ if (stage2_pte_table_empty(start_pte))
+ clear_stage2_pmd_entry(kvm, pmd, start_addr);
+ }
+
+ static void unmap_stage2_pmds(struct kvm *kvm, pud_t *pud,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ phys_addr_t next, start_addr = addr;
+ pmd_t *pmd, *start_pmd;
+
+ start_pmd = pmd = stage2_pmd_offset(pud, addr);
+ do {
+ next = stage2_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ if (pmd_thp_or_huge(*pmd)) {
+ pmd_t old_pmd = *pmd;
+
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+
+ kvm_flush_dcache_pmd(old_pmd);
+
+ put_page(virt_to_page(pmd));
+ } else {
+ unmap_stage2_ptes(kvm, pmd, addr, next);
+ }
+ }
+ } while (pmd++, addr = next, addr != end);
+
+ if (stage2_pmd_table_empty(start_pmd))
+ clear_stage2_pud_entry(kvm, pud, start_addr);
+ }
+
+ static void unmap_stage2_puds(struct kvm *kvm, pgd_t *pgd,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ phys_addr_t next, start_addr = addr;
+ pud_t *pud, *start_pud;
+
+ start_pud = pud = stage2_pud_offset(pgd, addr);
+ do {
+ next = stage2_pud_addr_end(addr, end);
+ if (!stage2_pud_none(*pud)) {
+ if (stage2_pud_huge(*pud)) {
+ pud_t old_pud = *pud;
+
+ stage2_pud_clear(pud);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ kvm_flush_dcache_pud(old_pud);
+ put_page(virt_to_page(pud));
+ } else {
+ unmap_stage2_pmds(kvm, pud, addr, next);
+ }
+ }
+ } while (pud++, addr = next, addr != end);
+
+ if (stage2_pud_table_empty(start_pud))
+ clear_stage2_pgd_entry(kvm, pgd, start_addr);
+ }
+
+ /**
+ * unmap_stage2_range -- Clear stage2 page table entries to unmap a range
+ * @kvm: The VM pointer
+ * @start: The intermediate physical base address of the range to unmap
+ * @size: The size of the area to unmap
+ *
+ * Clear a range of stage-2 mappings, lowering the various ref-counts. Must
+ * be called while holding mmu_lock (unless for freeing the stage2 pgd before
+ * destroying the VM), otherwise another faulting VCPU may come in and mess
+ * with things behind our backs.
+ */
+ static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
+ {
+ pgd_t *pgd;
+ phys_addr_t addr = start, end = start + size;
+ phys_addr_t next;
+
++ assert_spin_locked(&kvm->mmu_lock);
+ pgd = kvm->arch.pgd + stage2_pgd_index(addr);
+ do {
+ next = stage2_pgd_addr_end(addr, end);
+ if (!stage2_pgd_none(*pgd))
+ unmap_stage2_puds(kvm, pgd, addr, next);
++ /*
++ * If the range is too large, release the kvm->mmu_lock
++ * to prevent starvation and lockup detector warnings.
++ */
++ if (next != end)
++ cond_resched_lock(&kvm->mmu_lock);
+ } while (pgd++, addr = next, addr != end);
+ }
+
+ static void stage2_flush_ptes(struct kvm *kvm, pmd_t *pmd,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ pte_t *pte;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte) && !kvm_is_device_pfn(pte_pfn(*pte)))
+ kvm_flush_dcache_pte(*pte);
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ }
+
+ static void stage2_flush_pmds(struct kvm *kvm, pud_t *pud,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ pmd_t *pmd;
+ phys_addr_t next;
+
+ pmd = stage2_pmd_offset(pud, addr);
+ do {
+ next = stage2_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ if (pmd_thp_or_huge(*pmd))
+ kvm_flush_dcache_pmd(*pmd);
+ else
+ stage2_flush_ptes(kvm, pmd, addr, next);
+ }
+ } while (pmd++, addr = next, addr != end);
+ }
+
+ static void stage2_flush_puds(struct kvm *kvm, pgd_t *pgd,
+ phys_addr_t addr, phys_addr_t end)
+ {
+ pud_t *pud;
+ phys_addr_t next;
+
+ pud = stage2_pud_offset(pgd, addr);
+ do {
+ next = stage2_pud_addr_end(addr, end);
+ if (!stage2_pud_none(*pud)) {
+ if (stage2_pud_huge(*pud))
+ kvm_flush_dcache_pud(*pud);
+ else
+ stage2_flush_pmds(kvm, pud, addr, next);
+ }
+ } while (pud++, addr = next, addr != end);
+ }
+
+ static void stage2_flush_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *memslot)
+ {
+ phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT;
+ phys_addr_t end = addr + PAGE_SIZE * memslot->npages;
+ phys_addr_t next;
+ pgd_t *pgd;
+
+ pgd = kvm->arch.pgd + stage2_pgd_index(addr);
+ do {
+ next = stage2_pgd_addr_end(addr, end);
+ stage2_flush_puds(kvm, pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ }
+
+ /**
+ * stage2_flush_vm - Invalidate cache for pages mapped in stage 2
+ * @kvm: The struct kvm pointer
+ *
+ * Go through the stage 2 page tables and invalidate any cache lines
+ * backing memory already mapped to the VM.
+ */
+ static void stage2_flush_vm(struct kvm *kvm)
+ {
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+ int idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ spin_lock(&kvm->mmu_lock);
+
+ slots = kvm_memslots(kvm);
+ kvm_for_each_memslot(memslot, slots)
+ stage2_flush_memslot(kvm, memslot);
+
+ spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
+ }
+
+ static void clear_hyp_pgd_entry(pgd_t *pgd)
+ {
+ pud_t *pud_table __maybe_unused = pud_offset(pgd, 0UL);
+ pgd_clear(pgd);
+ pud_free(NULL, pud_table);
+ put_page(virt_to_page(pgd));
+ }
+
+ static void clear_hyp_pud_entry(pud_t *pud)
+ {
+ pmd_t *pmd_table __maybe_unused = pmd_offset(pud, 0);
+ VM_BUG_ON(pud_huge(*pud));
+ pud_clear(pud);
+ pmd_free(NULL, pmd_table);
+ put_page(virt_to_page(pud));
+ }
+
+ static void clear_hyp_pmd_entry(pmd_t *pmd)
+ {
+ pte_t *pte_table = pte_offset_kernel(pmd, 0);
+ VM_BUG_ON(pmd_thp_or_huge(*pmd));
+ pmd_clear(pmd);
+ pte_free_kernel(NULL, pte_table);
+ put_page(virt_to_page(pmd));
+ }
+
+ static void unmap_hyp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end)
+ {
+ pte_t *pte, *start_pte;
+
+ start_pte = pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ kvm_set_pte(pte, __pte(0));
+ put_page(virt_to_page(pte));
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+
+ if (hyp_pte_table_empty(start_pte))
+ clear_hyp_pmd_entry(pmd);
+ }
+
+ static void unmap_hyp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end)
+ {
+ phys_addr_t next;
+ pmd_t *pmd, *start_pmd;
+
+ start_pmd = pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ /* Hyp doesn't use huge pmds */
+ if (!pmd_none(*pmd))
+ unmap_hyp_ptes(pmd, addr, next);
+ } while (pmd++, addr = next, addr != end);
+
+ if (hyp_pmd_table_empty(start_pmd))
+ clear_hyp_pud_entry(pud);
+ }
+
+ static void unmap_hyp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end)
+ {
+ phys_addr_t next;
+ pud_t *pud, *start_pud;
+
+ start_pud = pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+ /* Hyp doesn't use huge puds */
+ if (!pud_none(*pud))
+ unmap_hyp_pmds(pud, addr, next);
+ } while (pud++, addr = next, addr != end);
+
+ if (hyp_pud_table_empty(start_pud))
+ clear_hyp_pgd_entry(pgd);
+ }
+
+ static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
+ {
+ pgd_t *pgd;
+ phys_addr_t addr = start, end = start + size;
+ phys_addr_t next;
+
+ /*
+ * We don't unmap anything from HYP, except at the hyp tear down.
+ * Hence, we don't have to invalidate the TLBs here.
+ */
+ pgd = pgdp + pgd_index(addr);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (!pgd_none(*pgd))
+ unmap_hyp_puds(pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ }
+
+ /**
+ * free_hyp_pgds - free Hyp-mode page tables
+ *
+ * Assumes hyp_pgd is a page table used strictly in Hyp-mode and
+ * therefore contains either mappings in the kernel memory area (above
+ * PAGE_OFFSET), or device mappings in the vmalloc range (from
+ * VMALLOC_START to VMALLOC_END).
+ *
+ * boot_hyp_pgd should only map two pages for the init code.
+ */
+ void free_hyp_pgds(void)
+ {
+ unsigned long addr;
+
+ mutex_lock(&kvm_hyp_pgd_mutex);
+
+ if (boot_hyp_pgd) {
+ unmap_hyp_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
+ free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order);
+ boot_hyp_pgd = NULL;
+ }
+
+ if (hyp_pgd) {
+ unmap_hyp_range(hyp_pgd, hyp_idmap_start, PAGE_SIZE);
+ for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
+ unmap_hyp_range(hyp_pgd, kern_hyp_va(addr), PGDIR_SIZE);
+ for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
+ unmap_hyp_range(hyp_pgd, kern_hyp_va(addr), PGDIR_SIZE);
+
+ free_pages((unsigned long)hyp_pgd, hyp_pgd_order);
+ hyp_pgd = NULL;
+ }
+ if (merged_hyp_pgd) {
+ clear_page(merged_hyp_pgd);
+ free_page((unsigned long)merged_hyp_pgd);
+ merged_hyp_pgd = NULL;
+ }
+
+ mutex_unlock(&kvm_hyp_pgd_mutex);
+ }
+
+ static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
+ {
+ pte_t *pte;
+ unsigned long addr;
+
+ addr = start;
+ do {
+ pte = pte_offset_kernel(pmd, addr);
+ kvm_set_pte(pte, pfn_pte(pfn, prot));
+ get_page(virt_to_page(pte));
+ kvm_flush_dcache_to_poc(pte, sizeof(*pte));
+ pfn++;
+ } while (addr += PAGE_SIZE, addr != end);
+ }
+
+ static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
+ {
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long addr, next;
+
+ addr = start;
+ do {
+ pmd = pmd_offset(pud, addr);
+
+ BUG_ON(pmd_sect(*pmd));
+
+ if (pmd_none(*pmd)) {
+ pte = pte_alloc_one_kernel(NULL, addr);
+ if (!pte) {
+ kvm_err("Cannot allocate Hyp pte\n");
+ return -ENOMEM;
+ }
+ pmd_populate_kernel(NULL, pmd, pte);
+ get_page(virt_to_page(pmd));
+ kvm_flush_dcache_to_poc(pmd, sizeof(*pmd));
+ }
+
+ next = pmd_addr_end(addr, end);
+
+ create_hyp_pte_mappings(pmd, addr, next, pfn, prot);
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
+
+ return 0;
+ }
+
+ static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start,
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
+ {
+ pud_t *pud;
+ pmd_t *pmd;
+ unsigned long addr, next;
+ int ret;
+
+ addr = start;
+ do {
+ pud = pud_offset(pgd, addr);
+
+ if (pud_none_or_clear_bad(pud)) {
+ pmd = pmd_alloc_one(NULL, addr);
+ if (!pmd) {
+ kvm_err("Cannot allocate Hyp pmd\n");
+ return -ENOMEM;
+ }
+ pud_populate(NULL, pud, pmd);
+ get_page(virt_to_page(pud));
+ kvm_flush_dcache_to_poc(pud, sizeof(*pud));
+ }
+
+ next = pud_addr_end(addr, end);
+ ret = create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
+ if (ret)
+ return ret;
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
+
+ return 0;
+ }
+
+ static int __create_hyp_mappings(pgd_t *pgdp,
+ unsigned long start, unsigned long end,
+ unsigned long pfn, pgprot_t prot)
+ {
+ pgd_t *pgd;
+ pud_t *pud;
+ unsigned long addr, next;
+ int err = 0;
+
+ mutex_lock(&kvm_hyp_pgd_mutex);
+ addr = start & PAGE_MASK;
+ end = PAGE_ALIGN(end);
+ do {
+ pgd = pgdp + pgd_index(addr);
+
+ if (pgd_none(*pgd)) {
+ pud = pud_alloc_one(NULL, addr);
+ if (!pud) {
+ kvm_err("Cannot allocate Hyp pud\n");
+ err = -ENOMEM;
+ goto out;
+ }
+ pgd_populate(NULL, pgd, pud);
+ get_page(virt_to_page(pgd));
+ kvm_flush_dcache_to_poc(pgd, sizeof(*pgd));
+ }
+
+ next = pgd_addr_end(addr, end);
+ err = create_hyp_pud_mappings(pgd, addr, next, pfn, prot);
+ if (err)
+ goto out;
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
+ out:
+ mutex_unlock(&kvm_hyp_pgd_mutex);
+ return err;
+ }
+
+ static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
+ {
+ if (!is_vmalloc_addr(kaddr)) {
+ BUG_ON(!virt_addr_valid(kaddr));
+ return __pa(kaddr);
+ } else {
+ return page_to_phys(vmalloc_to_page(kaddr)) +
+ offset_in_page(kaddr);
+ }
+ }
+
+ /**
+ * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
+ * @from: The virtual kernel start address of the range
+ * @to: The virtual kernel end address of the range (exclusive)
+ * @prot: The protection to be applied to this range
+ *
+ * The same virtual address as the kernel virtual address is also used
+ * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
+ * physical pages.
+ */
+ int create_hyp_mappings(void *from, void *to, pgprot_t prot)
+ {
+ phys_addr_t phys_addr;
+ unsigned long virt_addr;
+ unsigned long start = kern_hyp_va((unsigned long)from);
+ unsigned long end = kern_hyp_va((unsigned long)to);
+
+ if (is_kernel_in_hyp_mode())
+ return 0;
+
+ start = start & PAGE_MASK;
+ end = PAGE_ALIGN(end);
+
+ for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
+ int err;
+
+ phys_addr = kvm_kaddr_to_phys(from + virt_addr - start);
+ err = __create_hyp_mappings(hyp_pgd, virt_addr,
+ virt_addr + PAGE_SIZE,
+ __phys_to_pfn(phys_addr),
+ prot);
+ if (err)
+ return err;
+ }
+
+ return 0;
+ }
+
+ /**
+ * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
+ * @from: The kernel start VA of the range
+ * @to: The kernel end VA of the range (exclusive)
+ * @phys_addr: The physical start address which gets mapped
+ *
+ * The resulting HYP VA is the same as the kernel VA, modulo
+ * HYP_PAGE_OFFSET.
+ */
+ int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
+ {
+ unsigned long start = kern_hyp_va((unsigned long)from);
+ unsigned long end = kern_hyp_va((unsigned long)to);
+
+ if (is_kernel_in_hyp_mode())
+ return 0;
+
+ /* Check for a valid kernel IO mapping */
+ if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
+ return -EINVAL;
+
+ return __create_hyp_mappings(hyp_pgd, start, end,
+ __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
+ }
+
+ /**
+ * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation.
+ * @kvm: The KVM struct pointer for the VM.
+ *
+ * Allocates only the stage-2 HW PGD level table(s) (can support either full
+ * 40-bit input addresses or limited to 32-bit input addresses). Clears the
+ * allocated pages.
+ *
+ * Note we don't need locking here as this is only called when the VM is
+ * created, which can only be done once.
+ */
+ int kvm_alloc_stage2_pgd(struct kvm *kvm)
+ {
+ pgd_t *pgd;
+
+ if (kvm->arch.pgd != NULL) {
+ kvm_err("kvm_arch already initialized?\n");
+ return -EINVAL;
+ }
+
+ /* Allocate the HW PGD, making sure that each page gets its own refcount */
+ pgd = alloc_pages_exact(S2_PGD_SIZE, GFP_KERNEL | __GFP_ZERO);
+ if (!pgd)
+ return -ENOMEM;
+
+ kvm->arch.pgd = pgd;
+ return 0;
+ }
+
+ static void stage2_unmap_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *memslot)
+ {
+ hva_t hva = memslot->userspace_addr;
+ phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT;
+ phys_addr_t size = PAGE_SIZE * memslot->npages;
+ hva_t reg_end = hva + size;
+
+ /*
+ * A memory region could potentially cover multiple VMAs, and any holes
+ * between them, so iterate over all of them to find out if we should
+ * unmap any of them.
+ *
+ * +--------------------------------------------+
+ * +---------------+----------------+ +----------------+
+ * | : VMA 1 | VMA 2 | | VMA 3 : |
+ * +---------------+----------------+ +----------------+
+ * | memory region |
+ * +--------------------------------------------+
+ */
+ do {
+ struct vm_area_struct *vma = find_vma(current->mm, hva);
+ hva_t vm_start, vm_end;
+
+ if (!vma || vma->vm_start >= reg_end)
+ break;
+
+ /*
+ * Take the intersection of this VMA with the memory region
+ */
+ vm_start = max(hva, vma->vm_start);
+ vm_end = min(reg_end, vma->vm_end);
+
+ if (!(vma->vm_flags & VM_PFNMAP)) {
+ gpa_t gpa = addr + (vm_start - memslot->userspace_addr);
+ unmap_stage2_range(kvm, gpa, vm_end - vm_start);
+ }
+ hva = vm_end;
+ } while (hva < reg_end);
+ }
+
+ /**
+ * stage2_unmap_vm - Unmap Stage-2 RAM mappings
+ * @kvm: The struct kvm pointer
+ *
+ * Go through the memregions and unmap any reguler RAM
+ * backing memory already mapped to the VM.
+ */
+ void stage2_unmap_vm(struct kvm *kvm)
+ {
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+ int idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
++ down_read(¤t->mm->mmap_sem);
+ spin_lock(&kvm->mmu_lock);
+
+ slots = kvm_memslots(kvm);
+ kvm_for_each_memslot(memslot, slots)
+ stage2_unmap_memslot(kvm, memslot);
+
+ spin_unlock(&kvm->mmu_lock);
++ up_read(¤t->mm->mmap_sem);
+ srcu_read_unlock(&kvm->srcu, idx);
+ }
+
+ /**
+ * kvm_free_stage2_pgd - free all stage-2 tables
+ * @kvm: The KVM struct pointer for the VM.
+ *
+ * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all
+ * underlying level-2 and level-3 tables before freeing the actual level-1 table
+ * and setting the struct pointer to NULL.
+ *
+ * Note we don't need locking here as this is only called when the VM is
+ * destroyed, which can only be done once.
+ */
+ void kvm_free_stage2_pgd(struct kvm *kvm)
+ {
+ if (kvm->arch.pgd == NULL)
+ return;
+
++ spin_lock(&kvm->mmu_lock);
+ unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
++ spin_unlock(&kvm->mmu_lock);
++
+ /* Free the HW pgd, one page at a time */
+ free_pages_exact(kvm->arch.pgd, S2_PGD_SIZE);
+ kvm->arch.pgd = NULL;
+ }
+
+ static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ phys_addr_t addr)
+ {
+ pgd_t *pgd;
+ pud_t *pud;
+
+ pgd = kvm->arch.pgd + stage2_pgd_index(addr);
+ if (WARN_ON(stage2_pgd_none(*pgd))) {
+ if (!cache)
+ return NULL;
+ pud = mmu_memory_cache_alloc(cache);
+ stage2_pgd_populate(pgd, pud);
+ get_page(virt_to_page(pgd));
+ }
+
+ return stage2_pud_offset(pgd, addr);
+ }
+
+ static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ phys_addr_t addr)
+ {
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pud = stage2_get_pud(kvm, cache, addr);
+ if (stage2_pud_none(*pud)) {
+ if (!cache)
+ return NULL;
+ pmd = mmu_memory_cache_alloc(cache);
+ stage2_pud_populate(pud, pmd);
+ get_page(virt_to_page(pud));
+ }
+
+ return stage2_pmd_offset(pud, addr);
+ }
+
+ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache
+ *cache, phys_addr_t addr, const pmd_t *new_pmd)
+ {
+ pmd_t *pmd, old_pmd;
+
+ pmd = stage2_get_pmd(kvm, cache, addr);
+ VM_BUG_ON(!pmd);
+
+ /*
+ * Mapping in huge pages should only happen through a fault. If a
+ * page is merged into a transparent huge page, the individual
+ * subpages of that huge page should be unmapped through MMU
+ * notifiers before we get here.
+ *
+ * Merging of CompoundPages is not supported; they should become
+ * splitting first, unmapped, merged, and mapped back in on-demand.
+ */
+ VM_BUG_ON(pmd_present(*pmd) && pmd_pfn(*pmd) != pmd_pfn(*new_pmd));
+
+ old_pmd = *pmd;
+ if (pmd_present(old_pmd)) {
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ } else {
+ get_page(virt_to_page(pmd));
+ }
+
+ kvm_set_pmd(pmd, *new_pmd);
+ return 0;
+ }
+
+ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ phys_addr_t addr, const pte_t *new_pte,
+ unsigned long flags)
+ {
+ pmd_t *pmd;
+ pte_t *pte, old_pte;
+ bool iomap = flags & KVM_S2PTE_FLAG_IS_IOMAP;
+ bool logging_active = flags & KVM_S2_FLAG_LOGGING_ACTIVE;
+
+ VM_BUG_ON(logging_active && !cache);
+
+ /* Create stage-2 page table mapping - Levels 0 and 1 */
+ pmd = stage2_get_pmd(kvm, cache, addr);
+ if (!pmd) {
+ /*
+ * Ignore calls from kvm_set_spte_hva for unallocated
+ * address ranges.
+ */
+ return 0;
+ }
+
+ /*
+ * While dirty page logging - dissolve huge PMD, then continue on to
+ * allocate page.
+ */
+ if (logging_active)
+ stage2_dissolve_pmd(kvm, addr, pmd);
+
+ /* Create stage-2 page mappings - Level 2 */
+ if (pmd_none(*pmd)) {
+ if (!cache)
+ return 0; /* ignore calls from kvm_set_spte_hva */
+ pte = mmu_memory_cache_alloc(cache);
+ pmd_populate_kernel(NULL, pmd, pte);
+ get_page(virt_to_page(pmd));
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+
+ if (iomap && pte_present(*pte))
+ return -EFAULT;
+
+ /* Create 2nd stage page table mapping - Level 3 */
+ old_pte = *pte;
+ if (pte_present(old_pte)) {
+ kvm_set_pte(pte, __pte(0));
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ } else {
+ get_page(virt_to_page(pte));
+ }
+
+ kvm_set_pte(pte, *new_pte);
+ return 0;
+ }
+
+ #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+ static int stage2_ptep_test_and_clear_young(pte_t *pte)
+ {
+ if (pte_young(*pte)) {
+ *pte = pte_mkold(*pte);
+ return 1;
+ }
+ return 0;
+ }
+ #else
+ static int stage2_ptep_test_and_clear_young(pte_t *pte)
+ {
+ return __ptep_test_and_clear_young(pte);
+ }
+ #endif
+
+ static int stage2_pmdp_test_and_clear_young(pmd_t *pmd)
+ {
+ return stage2_ptep_test_and_clear_young((pte_t *)pmd);
+ }
+
+ /**
+ * kvm_phys_addr_ioremap - map a device range to guest IPA
+ *
+ * @kvm: The KVM pointer
+ * @guest_ipa: The IPA at which to insert the mapping
+ * @pa: The physical address of the device
+ * @size: The size of the mapping
+ */
+ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
+ phys_addr_t pa, unsigned long size, bool writable)
+ {
+ phys_addr_t addr, end;
+ int ret = 0;
+ unsigned long pfn;
+ struct kvm_mmu_memory_cache cache = { 0, };
+
+ end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK;
+ pfn = __phys_to_pfn(pa);
+
+ for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
+ pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE);
+
+ if (writable)
+ pte = kvm_s2pte_mkwrite(pte);
+
+ ret = mmu_topup_memory_cache(&cache, KVM_MMU_CACHE_MIN_PAGES,
+ KVM_NR_MEM_OBJS);
+ if (ret)
+ goto out;
+ spin_lock(&kvm->mmu_lock);
+ ret = stage2_set_pte(kvm, &cache, addr, &pte,
+ KVM_S2PTE_FLAG_IS_IOMAP);
+ spin_unlock(&kvm->mmu_lock);
+ if (ret)
+ goto out;
+
+ pfn++;
+ }
+
+ out:
+ mmu_free_memory_cache(&cache);
+ return ret;
+ }
+
+ static bool transparent_hugepage_adjust(kvm_pfn_t *pfnp, phys_addr_t *ipap)
+ {
+ kvm_pfn_t pfn = *pfnp;
+ gfn_t gfn = *ipap >> PAGE_SHIFT;
+
+ if (PageTransCompoundMap(pfn_to_page(pfn))) {
+ unsigned long mask;
+ /*
+ * The address we faulted on is backed by a transparent huge
+ * page. However, because we map the compound huge page and
+ * not the individual tail page, we need to transfer the
+ * refcount to the head page. We have to be careful that the
+ * THP doesn't start to split while we are adjusting the
+ * refcounts.
+ *
+ * We are sure this doesn't happen, because mmu_notifier_retry
+ * was successful and we are holding the mmu_lock, so if this
+ * THP is trying to split, it will be blocked in the mmu
+ * notifier before touching any of the pages, specifically
+ * before being able to call __split_huge_page_refcount().
+ *
+ * We can therefore safely transfer the refcount from PG_tail
+ * to PG_head and switch the pfn from a tail page to the head
+ * page accordingly.
+ */
+ mask = PTRS_PER_PMD - 1;
+ VM_BUG_ON((gfn & mask) != (pfn & mask));
+ if (pfn & mask) {
+ *ipap &= PMD_MASK;
+ kvm_release_pfn_clean(pfn);
+ pfn &= ~mask;
+ kvm_get_pfn(pfn);
+ *pfnp = pfn;
+ }
+
+ return true;
+ }
+
+ return false;
+ }
+
+ static bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
+ {
+ if (kvm_vcpu_trap_is_iabt(vcpu))
+ return false;
+
+ return kvm_vcpu_dabt_iswrite(vcpu);
+ }
+
+ /**
+ * stage2_wp_ptes - write protect PMD range
+ * @pmd: pointer to pmd entry
+ * @addr: range start address
+ * @end: range end address
+ */
+ static void stage2_wp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end)
+ {
+ pte_t *pte;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ if (!kvm_s2pte_readonly(pte))
+ kvm_set_s2pte_readonly(pte);
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ }
+
+ /**
+ * stage2_wp_pmds - write protect PUD range
+ * @pud: pointer to pud entry
+ * @addr: range start address
+ * @end: range end address
+ */
+ static void stage2_wp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end)
+ {
+ pmd_t *pmd;
+ phys_addr_t next;
+
+ pmd = stage2_pmd_offset(pud, addr);
+
+ do {
+ next = stage2_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ if (pmd_thp_or_huge(*pmd)) {
+ if (!kvm_s2pmd_readonly(pmd))
+ kvm_set_s2pmd_readonly(pmd);
+ } else {
+ stage2_wp_ptes(pmd, addr, next);
+ }
+ }
+ } while (pmd++, addr = next, addr != end);
+ }
+
+ /**
+ * stage2_wp_puds - write protect PGD range
+ * @pgd: pointer to pgd entry
+ * @addr: range start address
+ * @end: range end address
+ *
+ * Process PUD entries, for a huge PUD we cause a panic.
+ */
+ static void stage2_wp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end)
+ {
+ pud_t *pud;
+ phys_addr_t next;
+
+ pud = stage2_pud_offset(pgd, addr);
+ do {
+ next = stage2_pud_addr_end(addr, end);
+ if (!stage2_pud_none(*pud)) {
+ /* TODO:PUD not supported, revisit later if supported */
+ BUG_ON(stage2_pud_huge(*pud));
+ stage2_wp_pmds(pud, addr, next);
+ }
+ } while (pud++, addr = next, addr != end);
+ }
+
+ /**
+ * stage2_wp_range() - write protect stage2 memory region range
+ * @kvm: The KVM pointer
+ * @addr: Start address of range
+ * @end: End address of range
+ */
+ static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
+ {
+ pgd_t *pgd;
+ phys_addr_t next;
+
+ pgd = kvm->arch.pgd + stage2_pgd_index(addr);
+ do {
+ /*
+ * Release kvm_mmu_lock periodically if the memory region is
+ * large. Otherwise, we may see kernel panics with
+ * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCKUP_DETECTOR,
+ * CONFIG_LOCKDEP. Additionally, holding the lock too long
+ * will also starve other vCPUs.
+ */
+ if (need_resched() || spin_needbreak(&kvm->mmu_lock))
+ cond_resched_lock(&kvm->mmu_lock);
+
+ next = stage2_pgd_addr_end(addr, end);
+ if (stage2_pgd_present(*pgd))
+ stage2_wp_puds(pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ }
+
+ /**
+ * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot
+ * @kvm: The KVM pointer
+ * @slot: The memory slot to write protect
+ *
+ * Called to start logging dirty pages after memory region
+ * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns
+ * all present PMD and PTEs are write protected in the memory region.
+ * Afterwards read of dirty page log can be called.
+ *
+ * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired,
+ * serializing operations for VM memory regions.
+ */
+ void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
+ {
+ struct kvm_memslots *slots = kvm_memslots(kvm);
+ struct kvm_memory_slot *memslot = id_to_memslot(slots, slot);
+ phys_addr_t start = memslot->base_gfn << PAGE_SHIFT;
+ phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
+
+ spin_lock(&kvm->mmu_lock);
+ stage2_wp_range(kvm, start, end);
+ spin_unlock(&kvm->mmu_lock);
+ kvm_flush_remote_tlbs(kvm);
+ }
+
+ /**
+ * kvm_mmu_write_protect_pt_masked() - write protect dirty pages
+ * @kvm: The KVM pointer
+ * @slot: The memory slot associated with mask
+ * @gfn_offset: The gfn offset in memory slot
+ * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory
+ * slot to be write protected
+ *
+ * Walks bits set in mask write protects the associated pte's. Caller must
+ * acquire kvm_mmu_lock.
+ */
+ static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+ {
+ phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+ phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT;
+ phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
+
+ stage2_wp_range(kvm, start, end);
+ }
+
+ /*
+ * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected
+ * dirty pages.
+ *
+ * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to
+ * enable dirty logging for them.
+ */
+ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+ {
+ kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
+ }
+
+ static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, kvm_pfn_t pfn,
+ unsigned long size)
+ {
+ __coherent_cache_guest_page(vcpu, pfn, size);
+ }
+
+ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
+ struct kvm_memory_slot *memslot, unsigned long hva,
+ unsigned long fault_status)
+ {
+ int ret;
+ bool write_fault, writable, hugetlb = false, force_pte = false;
+ unsigned long mmu_seq;
+ gfn_t gfn = fault_ipa >> PAGE_SHIFT;
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
+ struct vm_area_struct *vma;
+ kvm_pfn_t pfn;
+ pgprot_t mem_type = PAGE_S2;
+ bool logging_active = memslot_is_logging(memslot);
+ unsigned long flags = 0;
+
+ write_fault = kvm_is_write_fault(vcpu);
+ if (fault_status == FSC_PERM && !write_fault) {
+ kvm_err("Unexpected L2 read permission error\n");
+ return -EFAULT;
+ }
+
+ /* Let's check if we will get back a huge page backed by hugetlbfs */
+ down_read(¤t->mm->mmap_sem);
+ vma = find_vma_intersection(current->mm, hva, hva + 1);
+ if (unlikely(!vma)) {
+ kvm_err("Failed to find VMA for hva 0x%lx\n", hva);
+ up_read(¤t->mm->mmap_sem);
+ return -EFAULT;
+ }
+
+ if (is_vm_hugetlb_page(vma) && !logging_active) {
+ hugetlb = true;
+ gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT;
+ } else {
+ /*
+ * Pages belonging to memslots that don't have the same
+ * alignment for userspace and IPA cannot be mapped using
+ * block descriptors even if the pages belong to a THP for
+ * the process, because the stage-2 block descriptor will
+ * cover more than a single THP and we loose atomicity for
+ * unmapping, updates, and splits of the THP or other pages
+ * in the stage-2 block range.
+ */
+ if ((memslot->userspace_addr & ~PMD_MASK) !=
+ ((memslot->base_gfn << PAGE_SHIFT) & ~PMD_MASK))
+ force_pte = true;
+ }
+ up_read(¤t->mm->mmap_sem);
+
+ /* We need minimum second+third level pages */
+ ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES,
+ KVM_NR_MEM_OBJS);
+ if (ret)
+ return ret;
+
+ mmu_seq = vcpu->kvm->mmu_notifier_seq;
+ /*
+ * Ensure the read of mmu_notifier_seq happens before we call
+ * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk
+ * the page we just got a reference to gets unmapped before we have a
+ * chance to grab the mmu_lock, which ensure that if the page gets
+ * unmapped afterwards, the call to kvm_unmap_hva will take it away
+ * from us again properly. This smp_rmb() interacts with the smp_wmb()
+ * in kvm_mmu_notifier_invalidate_<page|range_end>.
+ */
+ smp_rmb();
+
+ pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable);
+ if (is_error_noslot_pfn(pfn))
+ return -EFAULT;
+
+ if (kvm_is_device_pfn(pfn)) {
+ mem_type = PAGE_S2_DEVICE;
+ flags |= KVM_S2PTE_FLAG_IS_IOMAP;
+ } else if (logging_active) {
+ /*
+ * Faults on pages in a memslot with logging enabled
+ * should not be mapped with huge pages (it introduces churn
+ * and performance degradation), so force a pte mapping.
+ */
+ force_pte = true;
+ flags |= KVM_S2_FLAG_LOGGING_ACTIVE;
+
+ /*
+ * Only actually map the page as writable if this was a write
+ * fault.
+ */
+ if (!write_fault)
+ writable = false;
+ }
+
+ spin_lock(&kvm->mmu_lock);
+ if (mmu_notifier_retry(kvm, mmu_seq))
+ goto out_unlock;
+
+ if (!hugetlb && !force_pte)
+ hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa);
+
+ if (hugetlb) {
+ pmd_t new_pmd = pfn_pmd(pfn, mem_type);
+ new_pmd = pmd_mkhuge(new_pmd);
+ if (writable) {
+ new_pmd = kvm_s2pmd_mkwrite(new_pmd);
+ kvm_set_pfn_dirty(pfn);
+ }
+ coherent_cache_guest_page(vcpu, pfn, PMD_SIZE);
+ ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
+ } else {
+ pte_t new_pte = pfn_pte(pfn, mem_type);
+
+ if (writable) {
+ new_pte = kvm_s2pte_mkwrite(new_pte);
+ kvm_set_pfn_dirty(pfn);
+ mark_page_dirty(kvm, gfn);
+ }
+ coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE);
+ ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags);
+ }
+
+ out_unlock:
+ spin_unlock(&kvm->mmu_lock);
+ kvm_set_pfn_accessed(pfn);
+ kvm_release_pfn_clean(pfn);
+ return ret;
+ }
+
+ /*
+ * Resolve the access fault by making the page young again.
+ * Note that because the faulting entry is guaranteed not to be
+ * cached in the TLB, we don't need to invalidate anything.
+ * Only the HW Access Flag updates are supported for Stage 2 (no DBM),
+ * so there is no need for atomic (pte|pmd)_mkyoung operations.
+ */
+ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
+ {
+ pmd_t *pmd;
+ pte_t *pte;
+ kvm_pfn_t pfn;
+ bool pfn_valid = false;
+
+ trace_kvm_access_fault(fault_ipa);
+
+ spin_lock(&vcpu->kvm->mmu_lock);
+
+ pmd = stage2_get_pmd(vcpu->kvm, NULL, fault_ipa);
+ if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ goto out;
+
+ if (pmd_thp_or_huge(*pmd)) { /* THP, HugeTLB */
+ *pmd = pmd_mkyoung(*pmd);
+ pfn = pmd_pfn(*pmd);
+ pfn_valid = true;
+ goto out;
+ }
+
+ pte = pte_offset_kernel(pmd, fault_ipa);
+ if (pte_none(*pte)) /* Nothing there either */
+ goto out;
+
+ *pte = pte_mkyoung(*pte); /* Just a page... */
+ pfn = pte_pfn(*pte);
+ pfn_valid = true;
+ out:
+ spin_unlock(&vcpu->kvm->mmu_lock);
+ if (pfn_valid)
+ kvm_set_pfn_accessed(pfn);
+ }
+
+ /**
+ * kvm_handle_guest_abort - handles all 2nd stage aborts
+ * @vcpu: the VCPU pointer
+ * @run: the kvm_run structure
+ *
+ * Any abort that gets to the host is almost guaranteed to be caused by a
+ * missing second stage translation table entry, which can mean that either the
+ * guest simply needs more memory and we must allocate an appropriate page or it
+ * can mean that the guest tried to access I/O memory, which is emulated by user
+ * space. The distinction is based on the IPA causing the fault and whether this
+ * memory region has been registered as standard RAM by user space.
+ */
+ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
+ {
+ unsigned long fault_status;
+ phys_addr_t fault_ipa;
+ struct kvm_memory_slot *memslot;
+ unsigned long hva;
+ bool is_iabt, write_fault, writable;
+ gfn_t gfn;
+ int ret, idx;
+
+ is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
+ if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
+ kvm_inject_vabt(vcpu);
+ return 1;
+ }
+
+ fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+
+ trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
+ kvm_vcpu_get_hfar(vcpu), fault_ipa);
+
+ /* Check the stage-2 fault is trans. fault or write fault */
+ fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
+ if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
+ fault_status != FSC_ACCESS) {
+ kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
+ kvm_vcpu_trap_get_class(vcpu),
+ (unsigned long)kvm_vcpu_trap_get_fault(vcpu),
+ (unsigned long)kvm_vcpu_get_hsr(vcpu));
+ return -EFAULT;
+ }
+
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+ gfn = fault_ipa >> PAGE_SHIFT;
+ memslot = gfn_to_memslot(vcpu->kvm, gfn);
+ hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable);
+ write_fault = kvm_is_write_fault(vcpu);
+ if (kvm_is_error_hva(hva) || (write_fault && !writable)) {
+ if (is_iabt) {
+ /* Prefetch Abort on I/O address */
+ kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+ ret = 1;
+ goto out_unlock;
+ }
+
+ /*
+ * Check for a cache maintenance operation. Since we
+ * ended-up here, we know it is outside of any memory
+ * slot. But we can't find out if that is for a device,
+ * or if the guest is just being stupid. The only thing
+ * we know for sure is that this range cannot be cached.
+ *
+ * So let's assume that the guest is just being
+ * cautious, and skip the instruction.
+ */
+ if (kvm_vcpu_dabt_is_cm(vcpu)) {
+ kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+ ret = 1;
+ goto out_unlock;
+ }
+
+ /*
+ * The IPA is reported as [MAX:12], so we need to
+ * complement it with the bottom 12 bits from the
+ * faulting VA. This is always 12 bits, irrespective
+ * of the page size.
+ */
+ fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1);
+ ret = io_mem_abort(vcpu, run, fault_ipa);
+ goto out_unlock;
+ }
+
+ /* Userspace should not be able to register out-of-bounds IPAs */
+ VM_BUG_ON(fault_ipa >= KVM_PHYS_SIZE);
+
+ if (fault_status == FSC_ACCESS) {
+ handle_access_fault(vcpu, fault_ipa);
+ ret = 1;
+ goto out_unlock;
+ }
+
+ ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status);
+ if (ret == 0)
+ ret = 1;
+ out_unlock:
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+ return ret;
+ }
+
+ static int handle_hva_to_gpa(struct kvm *kvm,
+ unsigned long start,
+ unsigned long end,
+ int (*handler)(struct kvm *kvm,
+ gpa_t gpa, u64 size,
+ void *data),
+ void *data)
+ {
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+ int ret = 0;
+
+ slots = kvm_memslots(kvm);
+
+ /* we only care about the pages that the guest sees */
+ kvm_for_each_memslot(memslot, slots) {
+ unsigned long hva_start, hva_end;
+ gfn_t gpa;
+
+ hva_start = max(start, memslot->userspace_addr);
+ hva_end = min(end, memslot->userspace_addr +
+ (memslot->npages << PAGE_SHIFT));
+ if (hva_start >= hva_end)
+ continue;
+
+ gpa = hva_to_gfn_memslot(hva_start, memslot) << PAGE_SHIFT;
+ ret |= handler(kvm, gpa, (u64)(hva_end - hva_start), data);
+ }
+
+ return ret;
+ }
+
+ static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
+ {
+ unmap_stage2_range(kvm, gpa, size);
+ return 0;
+ }
+
+ int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
+ {
+ unsigned long end = hva + PAGE_SIZE;
+
+ if (!kvm->arch.pgd)
+ return 0;
+
+ trace_kvm_unmap_hva(hva);
+ handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
+ return 0;
+ }
+
+ int kvm_unmap_hva_range(struct kvm *kvm,
+ unsigned long start, unsigned long end)
+ {
+ if (!kvm->arch.pgd)
+ return 0;
+
+ trace_kvm_unmap_hva_range(start, end);
+ handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
+ return 0;
+ }
+
+ static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
+ {
+ pte_t *pte = (pte_t *)data;
+
+ WARN_ON(size != PAGE_SIZE);
+ /*
+ * We can always call stage2_set_pte with KVM_S2PTE_FLAG_LOGGING_ACTIVE
+ * flag clear because MMU notifiers will have unmapped a huge PMD before
+ * calling ->change_pte() (which in turn calls kvm_set_spte_hva()) and
+ * therefore stage2_set_pte() never needs to clear out a huge PMD
+ * through this calling path.
+ */
+ stage2_set_pte(kvm, NULL, gpa, pte, 0);
+ return 0;
+ }
+
+
+ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+ {
+ unsigned long end = hva + PAGE_SIZE;
+ pte_t stage2_pte;
+
+ if (!kvm->arch.pgd)
+ return;
+
+ trace_kvm_set_spte_hva(hva);
+ stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2);
+ handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte);
+ }
+
+ static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
+ {
+ pmd_t *pmd;
+ pte_t *pte;
+
+ WARN_ON(size != PAGE_SIZE && size != PMD_SIZE);
+ pmd = stage2_get_pmd(kvm, NULL, gpa);
+ if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ return 0;
+
+ if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */
+ return stage2_pmdp_test_and_clear_young(pmd);
+
+ pte = pte_offset_kernel(pmd, gpa);
+ if (pte_none(*pte))
+ return 0;
+
+ return stage2_ptep_test_and_clear_young(pte);
+ }
+
+ static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
+ {
+ pmd_t *pmd;
+ pte_t *pte;
+
+ WARN_ON(size != PAGE_SIZE && size != PMD_SIZE);
+ pmd = stage2_get_pmd(kvm, NULL, gpa);
+ if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ return 0;
+
+ if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */
+ return pmd_young(*pmd);
+
+ pte = pte_offset_kernel(pmd, gpa);
+ if (!pte_none(*pte)) /* Just a page... */
+ return pte_young(*pte);
+
+ return 0;
+ }
+
+ int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
+ {
+ trace_kvm_age_hva(start, end);
+ return handle_hva_to_gpa(kvm, start, end, kvm_age_hva_handler, NULL);
+ }
+
+ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
+ {
+ trace_kvm_test_age_hva(hva);
+ return handle_hva_to_gpa(kvm, hva, hva, kvm_test_age_hva_handler, NULL);
+ }
+
+ void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
+ {
+ mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
+ }
+
+ phys_addr_t kvm_mmu_get_httbr(void)
+ {
+ if (__kvm_cpu_uses_extended_idmap())
+ return virt_to_phys(merged_hyp_pgd);
+ else
+ return virt_to_phys(hyp_pgd);
+ }
+
+ phys_addr_t kvm_get_idmap_vector(void)
+ {
+ return hyp_idmap_vector;
+ }
+
+ static int kvm_map_idmap_text(pgd_t *pgd)
+ {
+ int err;
+
+ /* Create the idmap in the boot page tables */
+ err = __create_hyp_mappings(pgd,
+ hyp_idmap_start, hyp_idmap_end,
+ __phys_to_pfn(hyp_idmap_start),
+ PAGE_HYP_EXEC);
+ if (err)
+ kvm_err("Failed to idmap %lx-%lx\n",
+ hyp_idmap_start, hyp_idmap_end);
+
+ return err;
+ }
+
+ int kvm_mmu_init(void)
+ {
+ int err;
+
+ hyp_idmap_start = kvm_virt_to_phys(__hyp_idmap_text_start);
+ hyp_idmap_end = kvm_virt_to_phys(__hyp_idmap_text_end);
+ hyp_idmap_vector = kvm_virt_to_phys(__kvm_hyp_init);
+
+ /*
+ * We rely on the linker script to ensure at build time that the HYP
+ * init code does not cross a page boundary.
+ */
+ BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK);
+
+ kvm_info("IDMAP page: %lx\n", hyp_idmap_start);
+ kvm_info("HYP VA range: %lx:%lx\n",
+ kern_hyp_va(PAGE_OFFSET), kern_hyp_va(~0UL));
+
+ if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
+ hyp_idmap_start < kern_hyp_va(~0UL) &&
+ hyp_idmap_start != (unsigned long)__hyp_idmap_text_start) {
+ /*
+ * The idmap page is intersecting with the VA space,
+ * it is not safe to continue further.
+ */
+ kvm_err("IDMAP intersecting with HYP VA, unable to continue\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
+ if (!hyp_pgd) {
+ kvm_err("Hyp mode PGD not allocated\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (__kvm_cpu_uses_extended_idmap()) {
+ boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ hyp_pgd_order);
+ if (!boot_hyp_pgd) {
+ kvm_err("Hyp boot PGD not allocated\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = kvm_map_idmap_text(boot_hyp_pgd);
+ if (err)
+ goto out;
+
+ merged_hyp_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+ if (!merged_hyp_pgd) {
+ kvm_err("Failed to allocate extra HYP pgd\n");
+ goto out;
+ }
+ __kvm_extend_hypmap(boot_hyp_pgd, hyp_pgd, merged_hyp_pgd,
+ hyp_idmap_start);
+ } else {
+ err = kvm_map_idmap_text(hyp_pgd);
+ if (err)
+ goto out;
+ }
+
+ return 0;
+ out:
+ free_hyp_pgds();
+ return err;
+ }
+
+ void kvm_arch_commit_memory_region(struct kvm *kvm,
+ const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ const struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
+ {
+ /*
+ * At this point memslot has been committed and there is an
+ * allocated dirty_bitmap[], dirty pages will be be tracked while the
+ * memory slot is write protected.
+ */
+ if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES)
+ kvm_mmu_wp_memory_region(kvm, mem->slot);
+ }
+
+ int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *memslot,
+ const struct kvm_userspace_memory_region *mem,
+ enum kvm_mr_change change)
+ {
+ hva_t hva = mem->userspace_addr;
+ hva_t reg_end = hva + mem->memory_size;
+ bool writable = !(mem->flags & KVM_MEM_READONLY);
+ int ret = 0;
+
+ if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
+ change != KVM_MR_FLAGS_ONLY)
+ return 0;
+
+ /*
+ * Prevent userspace from creating a memory region outside of the IPA
+ * space addressable by the KVM guest IPA space.
+ */
+ if (memslot->base_gfn + memslot->npages >=
+ (KVM_PHYS_SIZE >> PAGE_SHIFT))
+ return -EFAULT;
+
++ down_read(¤t->mm->mmap_sem);
+ /*
+ * A memory region could potentially cover multiple VMAs, and any holes
+ * between them, so iterate over all of them to find out if we can map
+ * any of them right now.
+ *
+ * +--------------------------------------------+
+ * +---------------+----------------+ +----------------+
+ * | : VMA 1 | VMA 2 | | VMA 3 : |
+ * +---------------+----------------+ +----------------+
+ * | memory region |
+ * +--------------------------------------------+
+ */
+ do {
+ struct vm_area_struct *vma = find_vma(current->mm, hva);
+ hva_t vm_start, vm_end;
+
+ if (!vma || vma->vm_start >= reg_end)
+ break;
+
+ /*
+ * Mapping a read-only VMA is only allowed if the
+ * memory region is configured as read-only.
+ */
+ if (writable && !(vma->vm_flags & VM_WRITE)) {
+ ret = -EPERM;
+ break;
+ }
+
+ /*
+ * Take the intersection of this VMA with the memory region
+ */
+ vm_start = max(hva, vma->vm_start);
+ vm_end = min(reg_end, vma->vm_end);
+
+ if (vma->vm_flags & VM_PFNMAP) {
+ gpa_t gpa = mem->guest_phys_addr +
+ (vm_start - mem->userspace_addr);
+ phys_addr_t pa;
+
+ pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
+ pa += vm_start - vma->vm_start;
+
+ /* IO region dirty page logging not allowed */
- return ret;
++ if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
++ ret = -EINVAL;
++ goto out;
++ }
+
+ ret = kvm_phys_addr_ioremap(kvm, gpa, pa,
+ vm_end - vm_start,
+ writable);
+ if (ret)
+ break;
+ }
+ hva = vm_end;
+ } while (hva < reg_end);
+
+ if (change == KVM_MR_FLAGS_ONLY)
++ goto out;
+
+ spin_lock(&kvm->mmu_lock);
+ if (ret)
+ unmap_stage2_range(kvm, mem->guest_phys_addr, mem->memory_size);
+ else
+ stage2_flush_memslot(kvm, memslot);
+ spin_unlock(&kvm->mmu_lock);
++out:
++ up_read(¤t->mm->mmap_sem);
+ return ret;
+ }
+
+ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
+ struct kvm_memory_slot *dont)
+ {
+ }
+
+ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
+ unsigned long npages)
+ {
+ return 0;
+ }
+
+ void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots)
+ {
+ }
+
+ void kvm_arch_flush_shadow_all(struct kvm *kvm)
+ {
+ kvm_free_stage2_pgd(kvm);
+ }
+
+ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *slot)
+ {
+ gpa_t gpa = slot->base_gfn << PAGE_SHIFT;
+ phys_addr_t size = slot->npages << PAGE_SHIFT;
+
+ spin_lock(&kvm->mmu_lock);
+ unmap_stage2_range(kvm, gpa, size);
+ spin_unlock(&kvm->mmu_lock);
+ }
+
+ /*
+ * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
+ *
+ * Main problems:
+ * - S/W ops are local to a CPU (not broadcast)
+ * - We have line migration behind our back (speculation)
+ * - System caches don't support S/W at all (damn!)
+ *
+ * In the face of the above, the best we can do is to try and convert
+ * S/W ops to VA ops. Because the guest is not allowed to infer the
+ * S/W to PA mapping, it can only use S/W to nuke the whole cache,
+ * which is a rather good thing for us.
+ *
+ * Also, it is only used when turning caches on/off ("The expected
+ * usage of the cache maintenance instructions that operate by set/way
+ * is associated with the cache maintenance instructions associated
+ * with the powerdown and powerup of caches, if this is required by
+ * the implementation.").
+ *
+ * We use the following policy:
+ *
+ * - If we trap a S/W operation, we enable VM trapping to detect
+ * caches being turned on/off, and do a full clean.
+ *
+ * - We flush the caches on both caches being turned on and off.
+ *
+ * - Once the caches are enabled, we stop trapping VM ops.
+ */
+ void kvm_set_way_flush(struct kvm_vcpu *vcpu)
+ {
+ unsigned long hcr = vcpu_get_hcr(vcpu);
+
+ /*
+ * If this is the first time we do a S/W operation
+ * (i.e. HCR_TVM not set) flush the whole memory, and set the
+ * VM trapping.
+ *
+ * Otherwise, rely on the VM trapping to wait for the MMU +
+ * Caches to be turned off. At that point, we'll be able to
+ * clean the caches again.
+ */
+ if (!(hcr & HCR_TVM)) {
+ trace_kvm_set_way_flush(*vcpu_pc(vcpu),
+ vcpu_has_cache_enabled(vcpu));
+ stage2_flush_vm(vcpu->kvm);
+ vcpu_set_hcr(vcpu, hcr | HCR_TVM);
+ }
+ }
+
+ void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled)
+ {
+ bool now_enabled = vcpu_has_cache_enabled(vcpu);
+
+ /*
+ * If switching the MMU+caches on, need to invalidate the caches.
+ * If switching it off, need to clean the caches.
+ * Clean + invalidate does the trick always.
+ */
+ if (now_enabled != was_enabled)
+ stage2_flush_vm(vcpu->kvm);
+
+ /* Caches are now on, stop trapping VM ops (until a S/W op) */
+ if (now_enabled)
+ vcpu_set_hcr(vcpu, vcpu_get_hcr(vcpu) & ~HCR_TVM);
+
+ trace_kvm_toggle_cache(*vcpu_pc(vcpu), was_enabled, now_enabled);
+ }
projects / mirror_ubuntu-bionic-kernel.git / commitdiff