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
20 #define MSR_KVM_WALL_CLOCK 0x11
21 #define MSR_KVM_SYSTEM_TIME 0x12
23 #define KVM_MAX_MMU_OP_BATCH 32
25 /* Operations for KVM_HC_MMU_OP */
26 #define KVM_MMU_OP_WRITE_PTE 1
27 #define KVM_MMU_OP_FLUSH_TLB 2
28 #define KVM_MMU_OP_RELEASE_PT 3
30 /* Payload for KVM_HC_MMU_OP */
31 struct kvm_mmu_op_header {
36 struct kvm_mmu_op_write_pte {
37 struct kvm_mmu_op_header header;
42 struct kvm_mmu_op_flush_tlb {
43 struct kvm_mmu_op_header header;
46 struct kvm_mmu_op_release_pt {
47 struct kvm_mmu_op_header header;
52 #include <asm/processor.h>
54 extern void kvmclock_init(void);
57 /* This instruction is vmcall. On non-VT architectures, it will generate a
58 * trap that we will then rewrite to the appropriate instruction.
60 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
62 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
63 * instruction. The hypervisor may replace it with something else but only the
64 * instructions are guaranteed to be supported.
66 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
67 * The hypercall number should be placed in rax and the return value will be
68 * placed in rax. No other registers will be clobbered unless explicited
69 * noted by the particular hypercall.
72 static inline long kvm_hypercall0(unsigned int nr)
75 asm volatile(KVM_HYPERCALL
82 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
85 asm volatile(KVM_HYPERCALL
92 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
96 asm volatile(KVM_HYPERCALL
98 : "a"(nr), "b"(p1), "c"(p2)
103 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
104 unsigned long p2, unsigned long p3)
107 asm volatile(KVM_HYPERCALL
109 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
114 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
115 unsigned long p2, unsigned long p3,
119 asm volatile(KVM_HYPERCALL
121 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
126 static inline int kvm_para_available(void)
128 unsigned int eax, ebx, ecx, edx;
131 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
132 memcpy(signature + 0, &ebx, 4);
133 memcpy(signature + 4, &ecx, 4);
134 memcpy(signature + 8, &edx, 4);
137 if (strcmp(signature, "KVMKVMKVM") == 0)
143 static inline unsigned int kvm_arch_para_features(void)
145 return cpuid_eax(KVM_CPUID_FEATURES);
150 #endif /* _ASM_X86_KVM_PARA_H */