arch/x86/include/asm/kvm_para.h

   1 #ifndef _ASM_X86_KVM_PARA_H
   2 #define _ASM_X86_KVM_PARA_H
   3
   4 #include <linux/types.h>
   5 #include <asm/hyperv.h>
   6
   7 /* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
   8  * should be used to determine that a VM is running under KVM.
   9  */
  10 #define KVM_CPUID_SIGNATURE     0x40000000
  11
  12 /* This CPUID returns a feature bitmap in eax.  Before enabling a particular
  13  * paravirtualization, the appropriate feature bit should be checked.
  14  */
  15 #define KVM_CPUID_FEATURES      0x40000001
  16 #define KVM_FEATURE_CLOCKSOURCE         0
  17 #define KVM_FEATURE_NOP_IO_DELAY        1
  18 #define KVM_FEATURE_MMU_OP              2
  19 /* This indicates that the new set of kvmclock msrs
  20  * are available. The use of 0x11 and 0x12 is deprecated
  21  */
  22 #define KVM_FEATURE_CLOCKSOURCE2        3
  23 #define KVM_FEATURE_ASYNC_PF            4
  24 #define KVM_FEATURE_STEAL_TIME          5
  25
  26 /* The last 8 bits are used to indicate how to interpret the flags field
  27  * in pvclock structure. If no bits are set, all flags are ignored.
  28  */
  29 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT      24
  30
  31 #define MSR_KVM_WALL_CLOCK  0x11
  32 #define MSR_KVM_SYSTEM_TIME 0x12
  33
  34 #define KVM_MSR_ENABLED 1
  35 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
  36 #define MSR_KVM_WALL_CLOCK_NEW  0x4b564d00
  37 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
  38 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
  39 #define MSR_KVM_STEAL_TIME  0x4b564d03
  40
  41 struct kvm_steal_time {
  42         __u64 steal;
  43         __u32 version;
  44         __u32 flags;
  45         __u32 pad[12];
  46 };
  47
  48 #define KVM_STEAL_ALIGNMENT_BITS 5
  49 #define KVM_STEAL_VALID_BITS ((-1ULL << (KVM_STEAL_ALIGNMENT_BITS + 1)))
  50 #define KVM_STEAL_RESERVED_MASK (((1 << KVM_STEAL_ALIGNMENT_BITS) - 1 ) << 1)
  51
  52 #define KVM_MAX_MMU_OP_BATCH           32
  53
  54 #define KVM_ASYNC_PF_ENABLED                    (1 << 0)
  55 #define KVM_ASYNC_PF_SEND_ALWAYS                (1 << 1)
  56
  57 /* Operations for KVM_HC_MMU_OP */
  58 #define KVM_MMU_OP_WRITE_PTE            1
  59 #define KVM_MMU_OP_FLUSH_TLB            2
  60 #define KVM_MMU_OP_RELEASE_PT           3
  61
  62 /* Payload for KVM_HC_MMU_OP */
  63 struct kvm_mmu_op_header {
  64         __u32 op;
  65         __u32 pad;
  66 };
  67
  68 struct kvm_mmu_op_write_pte {
  69         struct kvm_mmu_op_header header;
  70         __u64 pte_phys;
  71         __u64 pte_val;
  72 };
  73
  74 struct kvm_mmu_op_flush_tlb {
  75         struct kvm_mmu_op_header header;
  76 };
  77
  78 struct kvm_mmu_op_release_pt {
  79         struct kvm_mmu_op_header header;
  80         __u64 pt_phys;
  81 };
  82
  83 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1
  84 #define KVM_PV_REASON_PAGE_READY 2
  85
  86 struct kvm_vcpu_pv_apf_data {
  87         __u32 reason;
  88         __u8 pad[60];
  89         __u32 enabled;
  90 };
  91
  92 #ifdef __KERNEL__
  93 #include <asm/processor.h>
  94
  95 extern void kvmclock_init(void);
  96 extern int kvm_register_clock(char *txt);
  97
  98
  99 /* This instruction is vmcall.  On non-VT architectures, it will generate a
 100  * trap that we will then rewrite to the appropriate instruction.
 101  */
 102 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
 103
 104 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
 105  * instruction.  The hypervisor may replace it with something else but only the
 106  * instructions are guaranteed to be supported.
 107  *
 108  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
 109  * The hypercall number should be placed in rax and the return value will be
 110  * placed in rax.  No other registers will be clobbered unless explicited
 111  * noted by the particular hypercall.
 112  */
 113
 114 static inline long kvm_hypercall0(unsigned int nr)
 115 {
 116         long ret;
 117         asm volatile(KVM_HYPERCALL
 118                      : "=a"(ret)
 119                      : "a"(nr)
 120                      : "memory");
 121         return ret;
 122 }
 123
 124 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
 125 {
 126         long ret;
 127         asm volatile(KVM_HYPERCALL
 128                      : "=a"(ret)
 129                      : "a"(nr), "b"(p1)
 130                      : "memory");
 131         return ret;
 132 }
 133
 134 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
 135                                   unsigned long p2)
 136 {
 137         long ret;
 138         asm volatile(KVM_HYPERCALL
 139                      : "=a"(ret)
 140                      : "a"(nr), "b"(p1), "c"(p2)
 141                      : "memory");
 142         return ret;
 143 }
 144
 145 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
 146                                   unsigned long p2, unsigned long p3)
 147 {
 148         long ret;
 149         asm volatile(KVM_HYPERCALL
 150                      : "=a"(ret)
 151                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
 152                      : "memory");
 153         return ret;
 154 }
 155
 156 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 157                                   unsigned long p2, unsigned long p3,
 158                                   unsigned long p4)
 159 {
 160         long ret;
 161         asm volatile(KVM_HYPERCALL
 162                      : "=a"(ret)
 163                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
 164                      : "memory");
 165         return ret;
 166 }
 167
 168 static inline int kvm_para_available(void)
 169 {
 170         unsigned int eax, ebx, ecx, edx;
 171         char signature[13];
 172
 173         cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
 174         memcpy(signature + 0, &ebx, 4);
 175         memcpy(signature + 4, &ecx, 4);
 176         memcpy(signature + 8, &edx, 4);
 177         signature[12] = 0;
 178
 179         if (strcmp(signature, "KVMKVMKVM") == 0)
 180                 return 1;
 181
 182         return 0;
 183 }
 184
 185 static inline unsigned int kvm_arch_para_features(void)
 186 {
 187         return cpuid_eax(KVM_CPUID_FEATURES);
 188 }
 189
 190 #ifdef CONFIG_KVM_GUEST
 191 void __init kvm_guest_init(void);
 192 void kvm_async_pf_task_wait(u32 token);
 193 void kvm_async_pf_task_wake(u32 token);
 194 u32 kvm_read_and_reset_pf_reason(void);
 195 extern void kvm_disable_steal_time(void);
 196 #else
 197 #define kvm_guest_init() do { } while (0)
 198 #define kvm_async_pf_task_wait(T) do {} while(0)
 199 #define kvm_async_pf_task_wake(T) do {} while(0)
 200 static inline u32 kvm_read_and_reset_pf_reason(void)
 201 {
 202         return 0;
 203 }
 204
 205 static inline void kvm_disable_steal_time(void)
 206 {
 207         return;
 208 }
 209 #endif
 210
 211 #endif /* __KERNEL__ */
 212
 213 #endif /* _ASM_X86_KVM_PARA_H */