arch/arm/include/asm/kvm_host.h

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #ifndef __ARM_KVM_HOST_H__
  20 #define __ARM_KVM_HOST_H__
  21
  22 #include <linux/types.h>
  23 #include <linux/kvm_types.h>
  24 #include <asm/kvm.h>
  25 #include <asm/kvm_asm.h>
  26 #include <asm/kvm_mmio.h>
  27 #include <asm/fpstate.h>
  28 #include <kvm/arm_arch_timer.h>
  29
  30 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  31
  32 #define KVM_USER_MEM_SLOTS 32
  33 #define KVM_HAVE_ONE_REG
  34 #define KVM_HALT_POLL_NS_DEFAULT 500000
  35
  36 #define KVM_VCPU_MAX_FEATURES 2
  37
  38 #include <kvm/arm_vgic.h>
  39
  40
  41 #ifdef CONFIG_ARM_GIC_V3
  42 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  43 #else
  44 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  45 #endif
  46
  47 #define KVM_REQ_VCPU_EXIT       (8 | KVM_REQUEST_NO_WAKEUP)
  48
  49 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  50 int __attribute_const__ kvm_target_cpu(void);
  51 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  52 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  53
  54 struct kvm_arch {
  55         /* VTTBR value associated with below pgd and vmid */
  56         u64    vttbr;
  57
  58         /* The last vcpu id that ran on each physical CPU */
  59         int __percpu *last_vcpu_ran;
  60
  61         /*
  62          * Anything that is not used directly from assembly code goes
  63          * here.
  64          */
  65
  66         /* The VMID generation used for the virt. memory system */
  67         u64    vmid_gen;
  68         u32    vmid;
  69
  70         /* Stage-2 page table */
  71         pgd_t *pgd;
  72
  73         /* Interrupt controller */
  74         struct vgic_dist        vgic;
  75         int max_vcpus;
  76 };
  77
  78 #define KVM_NR_MEM_OBJS     40
  79
  80 /*
  81  * We don't want allocation failures within the mmu code, so we preallocate
  82  * enough memory for a single page fault in a cache.
  83  */
  84 struct kvm_mmu_memory_cache {
  85         int nobjs;
  86         void *objects[KVM_NR_MEM_OBJS];
  87 };
  88
  89 struct kvm_vcpu_fault_info {
  90         u32 hsr;                /* Hyp Syndrome Register */
  91         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  92         u32 hpfar;              /* Hyp IPA Fault Address Register */
  93 };
  94
  95 /*
  96  * 0 is reserved as an invalid value.
  97  * Order should be kept in sync with the save/restore code.
  98  */
  99 enum vcpu_sysreg {
 100         __INVALID_SYSREG__,
 101         c0_MPIDR,               /* MultiProcessor ID Register */
 102         c0_CSSELR,              /* Cache Size Selection Register */
 103         c1_SCTLR,               /* System Control Register */
 104         c1_ACTLR,               /* Auxiliary Control Register */
 105         c1_CPACR,               /* Coprocessor Access Control */
 106         c2_TTBR0,               /* Translation Table Base Register 0 */
 107         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 108         c2_TTBR1,               /* Translation Table Base Register 1 */
 109         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 110         c2_TTBCR,               /* Translation Table Base Control R. */
 111         c3_DACR,                /* Domain Access Control Register */
 112         c5_DFSR,                /* Data Fault Status Register */
 113         c5_IFSR,                /* Instruction Fault Status Register */
 114         c5_ADFSR,               /* Auxilary Data Fault Status R */
 115         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 116         c6_DFAR,                /* Data Fault Address Register */
 117         c6_IFAR,                /* Instruction Fault Address Register */
 118         c7_PAR,                 /* Physical Address Register */
 119         c7_PAR_high,            /* PAR top 32 bits */
 120         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 121         c10_PRRR,               /* Primary Region Remap Register */
 122         c10_NMRR,               /* Normal Memory Remap Register */
 123         c12_VBAR,               /* Vector Base Address Register */
 124         c13_CID,                /* Context ID Register */
 125         c13_TID_URW,            /* Thread ID, User R/W */
 126         c13_TID_URO,            /* Thread ID, User R/O */
 127         c13_TID_PRIV,           /* Thread ID, Privileged */
 128         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 129         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 130         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 131         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 132 };
 133
 134 struct kvm_cpu_context {
 135         struct kvm_regs gp_regs;
 136         struct vfp_hard_struct vfp;
 137         u32 cp15[NR_CP15_REGS];
 138 };
 139
 140 typedef struct kvm_cpu_context kvm_cpu_context_t;
 141
 142 struct kvm_vcpu_arch {
 143         struct kvm_cpu_context ctxt;
 144
 145         int target; /* Processor target */
 146         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 147
 148         /* The CPU type we expose to the VM */
 149         u32 midr;
 150
 151         /* HYP trapping configuration */
 152         u32 hcr;
 153
 154         /* Interrupt related fields */
 155         u32 irq_lines;          /* IRQ and FIQ levels */
 156
 157         /* Exception Information */
 158         struct kvm_vcpu_fault_info fault;
 159
 160         /* Host FP context */
 161         kvm_cpu_context_t *host_cpu_context;
 162
 163         /* VGIC state */
 164         struct vgic_cpu vgic_cpu;
 165         struct arch_timer_cpu timer_cpu;
 166
 167         /*
 168          * Anything that is not used directly from assembly code goes
 169          * here.
 170          */
 171
 172         /* vcpu power-off state */
 173         bool power_off;
 174
 175          /* Don't run the guest (internal implementation need) */
 176         bool pause;
 177
 178         /* IO related fields */
 179         struct kvm_decode mmio_decode;
 180
 181         /* Cache some mmu pages needed inside spinlock regions */
 182         struct kvm_mmu_memory_cache mmu_page_cache;
 183
 184         /* Detect first run of a vcpu */
 185         bool has_run_once;
 186 };
 187
 188 struct kvm_vm_stat {
 189         ulong remote_tlb_flush;
 190 };
 191
 192 struct kvm_vcpu_stat {
 193         u64 halt_successful_poll;
 194         u64 halt_attempted_poll;
 195         u64 halt_poll_invalid;
 196         u64 halt_wakeup;
 197         u64 hvc_exit_stat;
 198         u64 wfe_exit_stat;
 199         u64 wfi_exit_stat;
 200         u64 mmio_exit_user;
 201         u64 mmio_exit_kernel;
 202         u64 exits;
 203 };
 204
 205 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 206
 207 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 208 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 209 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 210 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 211 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 212 unsigned long kvm_call_hyp(void *hypfn, ...);
 213 void force_vm_exit(const cpumask_t *mask);
 214
 215 #define KVM_ARCH_WANT_MMU_NOTIFIER
 216 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 217 int kvm_unmap_hva_range(struct kvm *kvm,
 218                         unsigned long start, unsigned long end);
 219 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 220
 221 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 222 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 223 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 224 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 225
 226 /* We do not have shadow page tables, hence the empty hooks */
 227 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 228                                                          unsigned long address)
 229 {
 230 }
 231
 232 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 233 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 234 void kvm_arm_halt_guest(struct kvm *kvm);
 235 void kvm_arm_resume_guest(struct kvm *kvm);
 236 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu);
 237 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu);
 238
 239 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 240 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 241 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 242 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 243
 244 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 245                 int exception_index);
 246
 247 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 248                                        unsigned long hyp_stack_ptr,
 249                                        unsigned long vector_ptr)
 250 {
 251         /*
 252          * Call initialization code, and switch to the full blown HYP
 253          * code. The init code doesn't need to preserve these
 254          * registers as r0-r3 are already callee saved according to
 255          * the AAPCS.
 256          * Note that we slightly misuse the prototype by casting the
 257          * stack pointer to a void *.
 258
 259          * The PGDs are always passed as the third argument, in order
 260          * to be passed into r2-r3 to the init code (yes, this is
 261          * compliant with the PCS!).
 262          */
 263
 264         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 265 }
 266
 267 static inline void __cpu_init_stage2(void)
 268 {
 269         kvm_call_hyp(__init_stage2_translation);
 270 }
 271
 272 static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
 273                                         phys_addr_t phys_idmap_start)
 274 {
 275         kvm_call_hyp((void *)virt_to_idmap(__kvm_hyp_reset), vector_ptr);
 276 }
 277
 278 static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
 279 {
 280         return 0;
 281 }
 282
 283 int kvm_perf_init(void);
 284 int kvm_perf_teardown(void);
 285
 286 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 287
 288 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 289
 290 static inline void kvm_arch_hardware_unsetup(void) {}
 291 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 292 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 293 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 294 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 295
 296 static inline void kvm_arm_init_debug(void) {}
 297 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 298 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 299 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 300 static inline int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 301                                              struct kvm_device_attr *attr)
 302 {
 303         return -ENXIO;
 304 }
 305 static inline int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 306                                              struct kvm_device_attr *attr)
 307 {
 308         return -ENXIO;
 309 }
 310 static inline int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 311                                              struct kvm_device_attr *attr)
 312 {
 313         return -ENXIO;
 314 }
 315
 316 #endif /* __ARM_KVM_HOST_H__ */