1 #ifndef _ASM_X86_KVM_PARA_H
2 #define _ASM_X86_KVM_PARA_H
4 #include <linux/types.h>
5 #include <asm/hyperv.h>
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.
10 #define KVM_CPUID_SIGNATURE 0x40000000
12 /* This CPUID returns a feature bitmap in eax. Before enabling a particular
13 * paravirtualization, the appropriate feature bit should be checked.
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
22 #define KVM_FEATURE_CLOCKSOURCE2 3
24 #define MSR_KVM_WALL_CLOCK 0x11
25 #define MSR_KVM_SYSTEM_TIME 0x12
27 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
28 #define MSR_KVM_WALL_CLOCK_NEW 0x4b564d00
29 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
31 #define KVM_MAX_MMU_OP_BATCH 32
33 /* Operations for KVM_HC_MMU_OP */
34 #define KVM_MMU_OP_WRITE_PTE 1
35 #define KVM_MMU_OP_FLUSH_TLB 2
36 #define KVM_MMU_OP_RELEASE_PT 3
38 /* Payload for KVM_HC_MMU_OP */
39 struct kvm_mmu_op_header {
44 struct kvm_mmu_op_write_pte {
45 struct kvm_mmu_op_header header;
50 struct kvm_mmu_op_flush_tlb {
51 struct kvm_mmu_op_header header;
54 struct kvm_mmu_op_release_pt {
55 struct kvm_mmu_op_header header;
60 #include <asm/processor.h>
62 extern void kvmclock_init(void);
65 /* This instruction is vmcall. On non-VT architectures, it will generate a
66 * trap that we will then rewrite to the appropriate instruction.
68 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
70 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
71 * instruction. The hypervisor may replace it with something else but only the
72 * instructions are guaranteed to be supported.
74 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
75 * The hypercall number should be placed in rax and the return value will be
76 * placed in rax. No other registers will be clobbered unless explicited
77 * noted by the particular hypercall.
80 static inline long kvm_hypercall0(unsigned int nr)
83 asm volatile(KVM_HYPERCALL
90 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
93 asm volatile(KVM_HYPERCALL
100 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
104 asm volatile(KVM_HYPERCALL
106 : "a"(nr), "b"(p1), "c"(p2)
111 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
112 unsigned long p2, unsigned long p3)
115 asm volatile(KVM_HYPERCALL
117 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
122 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
123 unsigned long p2, unsigned long p3,
127 asm volatile(KVM_HYPERCALL
129 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
134 static inline int kvm_para_available(void)
136 unsigned int eax, ebx, ecx, edx;
139 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
140 memcpy(signature + 0, &ebx, 4);
141 memcpy(signature + 4, &ecx, 4);
142 memcpy(signature + 8, &edx, 4);
145 if (strcmp(signature, "KVMKVMKVM") == 0)
151 static inline unsigned int kvm_arch_para_features(void)
153 return cpuid_eax(KVM_CPUID_FEATURES);
158 #endif /* _ASM_X86_KVM_PARA_H */