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