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