arch/x86/kvm/x86.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ARCH_X86_KVM_X86_H
   3 #define ARCH_X86_KVM_X86_H
   4
   5 #include <linux/kvm_host.h>
   6 #include <asm/pvclock.h>
   7 #include "kvm_cache_regs.h"
   8
   9 #define KVM_DEFAULT_PLE_GAP             128
  10 #define KVM_VMX_DEFAULT_PLE_WINDOW      4096
  11 #define KVM_DEFAULT_PLE_WINDOW_GROW     2
  12 #define KVM_DEFAULT_PLE_WINDOW_SHRINK   0
  13 #define KVM_VMX_DEFAULT_PLE_WINDOW_MAX  UINT_MAX
  14 #define KVM_SVM_DEFAULT_PLE_WINDOW_MAX  USHRT_MAX
  15 #define KVM_SVM_DEFAULT_PLE_WINDOW      3000
  16
  17 static inline unsigned int __grow_ple_window(unsigned int val,
  18                 unsigned int base, unsigned int modifier, unsigned int max)
  19 {
  20         u64 ret = val;
  21
  22         if (modifier < 1)
  23                 return base;
  24
  25         if (modifier < base)
  26                 ret *= modifier;
  27         else
  28                 ret += modifier;
  29
  30         return min(ret, (u64)max);
  31 }
  32
  33 static inline unsigned int __shrink_ple_window(unsigned int val,
  34                 unsigned int base, unsigned int modifier, unsigned int min)
  35 {
  36         if (modifier < 1)
  37                 return base;
  38
  39         if (modifier < base)
  40                 val /= modifier;
  41         else
  42                 val -= modifier;
  43
  44         return max(val, min);
  45 }
  46
  47 #define MSR_IA32_CR_PAT_DEFAULT  0x0007040600070406ULL
  48
  49 static inline void kvm_clear_exception_queue(struct kvm_vcpu *vcpu)
  50 {
  51         vcpu->arch.exception.pending = false;
  52         vcpu->arch.exception.injected = false;
  53 }
  54
  55 static inline void kvm_queue_interrupt(struct kvm_vcpu *vcpu, u8 vector,
  56         bool soft)
  57 {
  58         vcpu->arch.interrupt.injected = true;
  59         vcpu->arch.interrupt.soft = soft;
  60         vcpu->arch.interrupt.nr = vector;
  61 }
  62
  63 static inline void kvm_clear_interrupt_queue(struct kvm_vcpu *vcpu)
  64 {
  65         vcpu->arch.interrupt.injected = false;
  66 }
  67
  68 static inline bool kvm_event_needs_reinjection(struct kvm_vcpu *vcpu)
  69 {
  70         return vcpu->arch.exception.injected || vcpu->arch.interrupt.injected ||
  71                 vcpu->arch.nmi_injected;
  72 }
  73
  74 static inline bool kvm_exception_is_soft(unsigned int nr)
  75 {
  76         return (nr == BP_VECTOR) || (nr == OF_VECTOR);
  77 }
  78
  79 static inline bool is_protmode(struct kvm_vcpu *vcpu)
  80 {
  81         return kvm_read_cr0_bits(vcpu, X86_CR0_PE);
  82 }
  83
  84 static inline int is_long_mode(struct kvm_vcpu *vcpu)
  85 {
  86 #ifdef CONFIG_X86_64
  87         return vcpu->arch.efer & EFER_LMA;
  88 #else
  89         return 0;
  90 #endif
  91 }
  92
  93 static inline bool is_64_bit_mode(struct kvm_vcpu *vcpu)
  94 {
  95         int cs_db, cs_l;
  96
  97         if (!is_long_mode(vcpu))
  98                 return false;
  99         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 100         return cs_l;
 101 }
 102
 103 static inline bool is_la57_mode(struct kvm_vcpu *vcpu)
 104 {
 105 #ifdef CONFIG_X86_64
 106         return (vcpu->arch.efer & EFER_LMA) &&
 107                  kvm_read_cr4_bits(vcpu, X86_CR4_LA57);
 108 #else
 109         return 0;
 110 #endif
 111 }
 112
 113 static inline bool x86_exception_has_error_code(unsigned int vector)
 114 {
 115         static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |
 116                         BIT(NP_VECTOR) | BIT(SS_VECTOR) | BIT(GP_VECTOR) |
 117                         BIT(PF_VECTOR) | BIT(AC_VECTOR);
 118
 119         return (1U << vector) & exception_has_error_code;
 120 }
 121
 122 static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)
 123 {
 124         return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;
 125 }
 126
 127 static inline int is_pae(struct kvm_vcpu *vcpu)
 128 {
 129         return kvm_read_cr4_bits(vcpu, X86_CR4_PAE);
 130 }
 131
 132 static inline int is_pse(struct kvm_vcpu *vcpu)
 133 {
 134         return kvm_read_cr4_bits(vcpu, X86_CR4_PSE);
 135 }
 136
 137 static inline int is_paging(struct kvm_vcpu *vcpu)
 138 {
 139         return likely(kvm_read_cr0_bits(vcpu, X86_CR0_PG));
 140 }
 141
 142 static inline bool is_pae_paging(struct kvm_vcpu *vcpu)
 143 {
 144         return !is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu);
 145 }
 146
 147 static inline u8 vcpu_virt_addr_bits(struct kvm_vcpu *vcpu)
 148 {
 149         return kvm_read_cr4_bits(vcpu, X86_CR4_LA57) ? 57 : 48;
 150 }
 151
 152 static inline u8 ctxt_virt_addr_bits(struct x86_emulate_ctxt *ctxt)
 153 {
 154         return (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_LA57) ? 57 : 48;
 155 }
 156
 157 static inline u64 get_canonical(u64 la, u8 vaddr_bits)
 158 {
 159         return ((int64_t)la << (64 - vaddr_bits)) >> (64 - vaddr_bits);
 160 }
 161
 162 static inline bool is_noncanonical_address(u64 la, struct kvm_vcpu *vcpu)
 163 {
 164         return get_canonical(la, vcpu_virt_addr_bits(vcpu)) != la;
 165 }
 166
 167 static inline bool emul_is_noncanonical_address(u64 la,
 168                                                 struct x86_emulate_ctxt *ctxt)
 169 {
 170         return get_canonical(la, ctxt_virt_addr_bits(ctxt)) != la;
 171 }
 172
 173 static inline void vcpu_cache_mmio_info(struct kvm_vcpu *vcpu,
 174                                         gva_t gva, gfn_t gfn, unsigned access)
 175 {
 176         u64 gen = kvm_memslots(vcpu->kvm)->generation;
 177
 178         if (unlikely(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS))
 179                 return;
 180
 181         /*
 182          * If this is a shadow nested page table, the "GVA" is
 183          * actually a nGPA.
 184          */
 185         vcpu->arch.mmio_gva = mmu_is_nested(vcpu) ? 0 : gva & PAGE_MASK;
 186         vcpu->arch.mmio_access = access;
 187         vcpu->arch.mmio_gfn = gfn;
 188         vcpu->arch.mmio_gen = gen;
 189 }
 190
 191 static inline bool vcpu_match_mmio_gen(struct kvm_vcpu *vcpu)
 192 {
 193         return vcpu->arch.mmio_gen == kvm_memslots(vcpu->kvm)->generation;
 194 }
 195
 196 /*
 197  * Clear the mmio cache info for the given gva. If gva is MMIO_GVA_ANY, we
 198  * clear all mmio cache info.
 199  */
 200 #define MMIO_GVA_ANY (~(gva_t)0)
 201
 202 static inline void vcpu_clear_mmio_info(struct kvm_vcpu *vcpu, gva_t gva)
 203 {
 204         if (gva != MMIO_GVA_ANY && vcpu->arch.mmio_gva != (gva & PAGE_MASK))
 205                 return;
 206
 207         vcpu->arch.mmio_gva = 0;
 208 }
 209
 210 static inline bool vcpu_match_mmio_gva(struct kvm_vcpu *vcpu, unsigned long gva)
 211 {
 212         if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gva &&
 213               vcpu->arch.mmio_gva == (gva & PAGE_MASK))
 214                 return true;
 215
 216         return false;
 217 }
 218
 219 static inline bool vcpu_match_mmio_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 220 {
 221         if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gfn &&
 222               vcpu->arch.mmio_gfn == gpa >> PAGE_SHIFT)
 223                 return true;
 224
 225         return false;
 226 }
 227
 228 static inline unsigned long kvm_register_readl(struct kvm_vcpu *vcpu, int reg)
 229 {
 230         unsigned long val = kvm_register_read(vcpu, reg);
 231
 232         return is_64_bit_mode(vcpu) ? val : (u32)val;
 233 }
 234
 235 static inline void kvm_register_writel(struct kvm_vcpu *vcpu,
 236                                        int reg, unsigned long val)
 237 {
 238         if (!is_64_bit_mode(vcpu))
 239                 val = (u32)val;
 240         return kvm_register_write(vcpu, reg, val);
 241 }
 242
 243 static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk)
 244 {
 245         return !(kvm->arch.disabled_quirks & quirk);
 246 }
 247
 248 static inline bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu)
 249 {
 250         return is_smm(vcpu) || kvm_x86_ops->apic_init_signal_blocked(vcpu);
 251 }
 252
 253 void kvm_set_pending_timer(struct kvm_vcpu *vcpu);
 254 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
 255
 256 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr);
 257 u64 get_kvmclock_ns(struct kvm *kvm);
 258
 259 int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
 260         gva_t addr, void *val, unsigned int bytes,
 261         struct x86_exception *exception);
 262
 263 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu,
 264         gva_t addr, void *val, unsigned int bytes,
 265         struct x86_exception *exception);
 266
 267 int handle_ud(struct kvm_vcpu *vcpu);
 268
 269 void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu);
 270
 271 void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu);
 272 u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 273 bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 274 int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 275 int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 276 bool kvm_mtrr_check_gfn_range_consistency(struct kvm_vcpu *vcpu, gfn_t gfn,
 277                                           int page_num);
 278 bool kvm_vector_hashing_enabled(void);
 279 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 280                             int emulation_type, void *insn, int insn_len);
 281 enum exit_fastpath_completion handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu);
 282
 283 #define KVM_SUPPORTED_XCR0     (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
 284                                 | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
 285                                 | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \
 286                                 | XFEATURE_MASK_PKRU)
 287 extern u64 host_xcr0;
 288
 289 extern u64 kvm_supported_xcr0(void);
 290
 291 extern unsigned int min_timer_period_us;
 292
 293 extern bool enable_vmware_backdoor;
 294
 295 extern int pi_inject_timer;
 296
 297 extern struct static_key kvm_no_apic_vcpu;
 298
 299 static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
 300 {
 301         return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
 302                                    vcpu->arch.virtual_tsc_shift);
 303 }
 304
 305 /* Same "calling convention" as do_div:
 306  * - divide (n << 32) by base
 307  * - put result in n
 308  * - return remainder
 309  */
 310 #define do_shl32_div32(n, base)                                 \
 311         ({                                                      \
 312             u32 __quot, __rem;                                  \
 313             asm("divl %2" : "=a" (__quot), "=d" (__rem)         \
 314                         : "rm" (base), "0" (0), "1" ((u32) n)); \
 315             n = __quot;                                         \
 316             __rem;                                              \
 317          })
 318
 319 static inline bool kvm_mwait_in_guest(struct kvm *kvm)
 320 {
 321         return kvm->arch.mwait_in_guest;
 322 }
 323
 324 static inline bool kvm_hlt_in_guest(struct kvm *kvm)
 325 {
 326         return kvm->arch.hlt_in_guest;
 327 }
 328
 329 static inline bool kvm_pause_in_guest(struct kvm *kvm)
 330 {
 331         return kvm->arch.pause_in_guest;
 332 }
 333
 334 static inline bool kvm_cstate_in_guest(struct kvm *kvm)
 335 {
 336         return kvm->arch.cstate_in_guest;
 337 }
 338
 339 DECLARE_PER_CPU(struct kvm_vcpu *, current_vcpu);
 340
 341 static inline void kvm_before_interrupt(struct kvm_vcpu *vcpu)
 342 {
 343         __this_cpu_write(current_vcpu, vcpu);
 344 }
 345
 346 static inline void kvm_after_interrupt(struct kvm_vcpu *vcpu)
 347 {
 348         __this_cpu_write(current_vcpu, NULL);
 349 }
 350
 351
 352 static inline bool kvm_pat_valid(u64 data)
 353 {
 354         if (data & 0xF8F8F8F8F8F8F8F8ull)
 355                 return false;
 356         /* 0, 1, 4, 5, 6, 7 are valid values.  */
 357         return (data | ((data & 0x0202020202020202ull) << 1)) == data;
 358 }
 359
 360 static inline bool kvm_dr7_valid(unsigned long data)
 361 {
 362         /* Bits [63:32] are reserved */
 363         return !(data >> 32);
 364 }
 365
 366 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
 367 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
 368 u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu);
 369
 370 #endif