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
  25 /* The last 8 bits are used to indicate how to interpret the flags field
  26  * in pvclock structure. If no bits are set, all flags are ignored.
  27  */
  28 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT      24
  29
  30 #define MSR_KVM_WALL_CLOCK  0x11
  31 #define MSR_KVM_SYSTEM_TIME 0x12
  32
  33 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
  34 #define MSR_KVM_WALL_CLOCK_NEW  0x4b564d00
  35 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
  36 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
  37
  38 #define KVM_MAX_MMU_OP_BATCH           32
  39
  40 #define KVM_ASYNC_PF_ENABLED                    (1 << 0)
  41 #define KVM_ASYNC_PF_SEND_ALWAYS                (1 << 1)
  42
  43 /* Operations for KVM_HC_MMU_OP */
  44 #define KVM_MMU_OP_WRITE_PTE            1
  45 #define KVM_MMU_OP_FLUSH_TLB            2
  46 #define KVM_MMU_OP_RELEASE_PT           3
  47
  48 /* Payload for KVM_HC_MMU_OP */
  49 struct kvm_mmu_op_header {
  50         __u32 op;
  51         __u32 pad;
  52 };
  53
  54 struct kvm_mmu_op_write_pte {
  55         struct kvm_mmu_op_header header;
  56         __u64 pte_phys;
  57         __u64 pte_val;
  58 };
  59
  60 struct kvm_mmu_op_flush_tlb {
  61         struct kvm_mmu_op_header header;
  62 };
  63
  64 struct kvm_mmu_op_release_pt {
  65         struct kvm_mmu_op_header header;
  66         __u64 pt_phys;
  67 };
  68
  69 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1
  70 #define KVM_PV_REASON_PAGE_READY 2
  71
  72 struct kvm_vcpu_pv_apf_data {
  73         __u32 reason;
  74         __u8 pad[60];
  75         __u32 enabled;
  76 };
  77
  78 #ifdef __KERNEL__
  79 #include <asm/processor.h>
  80
  81 extern void kvmclock_init(void);
  82 extern int kvm_register_clock(char *txt);
  83
  84
  85 /* This instruction is vmcall.  On non-VT architectures, it will generate a
  86  * trap that we will then rewrite to the appropriate instruction.
  87  */
  88 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
  89
  90 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
  91  * instruction.  The hypervisor may replace it with something else but only the
  92  * instructions are guaranteed to be supported.
  93  *
  94  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
  95  * The hypercall number should be placed in rax and the return value will be
  96  * placed in rax.  No other registers will be clobbered unless explicited
  97  * noted by the particular hypercall.
  98  */
  99
 100 static inline long kvm_hypercall0(unsigned int nr)
 101 {
 102         long ret;
 103         asm volatile(KVM_HYPERCALL
 104                      : "=a"(ret)
 105                      : "a"(nr)
 106                      : "memory");
 107         return ret;
 108 }
 109
 110 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
 111 {
 112         long ret;
 113         asm volatile(KVM_HYPERCALL
 114                      : "=a"(ret)
 115                      : "a"(nr), "b"(p1)
 116                      : "memory");
 117         return ret;
 118 }
 119
 120 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
 121                                   unsigned long p2)
 122 {
 123         long ret;
 124         asm volatile(KVM_HYPERCALL
 125                      : "=a"(ret)
 126                      : "a"(nr), "b"(p1), "c"(p2)
 127                      : "memory");
 128         return ret;
 129 }
 130
 131 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
 132                                   unsigned long p2, unsigned long p3)
 133 {
 134         long ret;
 135         asm volatile(KVM_HYPERCALL
 136                      : "=a"(ret)
 137                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
 138                      : "memory");
 139         return ret;
 140 }
 141
 142 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 143                                   unsigned long p2, unsigned long p3,
 144                                   unsigned long p4)
 145 {
 146         long ret;
 147         asm volatile(KVM_HYPERCALL
 148                      : "=a"(ret)
 149                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
 150                      : "memory");
 151         return ret;
 152 }
 153
 154 static inline int kvm_para_available(void)
 155 {
 156         unsigned int eax, ebx, ecx, edx;
 157         char signature[13];
 158
 159         cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
 160         memcpy(signature + 0, &ebx, 4);
 161         memcpy(signature + 4, &ecx, 4);
 162         memcpy(signature + 8, &edx, 4);
 163         signature[12] = 0;
 164
 165         if (strcmp(signature, "KVMKVMKVM") == 0)
 166                 return 1;
 167
 168         return 0;
 169 }
 170
 171 static inline unsigned int kvm_arch_para_features(void)
 172 {
 173         return cpuid_eax(KVM_CPUID_FEATURES);
 174 }
 175
 176 #ifdef CONFIG_KVM_GUEST
 177 void __init kvm_guest_init(void);
 178 void kvm_async_pf_task_wait(u32 token);
 179 void kvm_async_pf_task_wake(u32 token);
 180 u32 kvm_read_and_reset_pf_reason(void);
 181 #else
 182 #define kvm_guest_init() do { } while (0)
 183 #define kvm_async_pf_task_wait(T) do {} while(0)
 184 #define kvm_async_pf_task_wake(T) do {} while(0)
 185 static inline u32 kvm_read_and_reset_pf_reason(void)
 186 {
 187         return 0;
 188 }
 189 #endif
 190
 191 #endif /* __KERNEL__ */
 192
 193 #endif /* _ASM_X86_KVM_PARA_H */