1 #ifndef __X86_KVM_PARA_H
2 #define __X86_KVM_PARA_H
4 /* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
5 * should be used to determine that a VM is running under KVM.
7 #define KVM_CPUID_SIGNATURE 0x40000000
9 /* This CPUID returns a feature bitmap in eax. Before enabling a particular
10 * paravirtualization, the appropriate feature bit should be checked.
12 #define KVM_CPUID_FEATURES 0x40000001
13 #define KVM_FEATURE_CLOCKSOURCE 0
14 #define KVM_FEATURE_NOP_IO_DELAY 1
15 #define KVM_FEATURE_MMU_OP 2
17 #define MSR_KVM_WALL_CLOCK 0x11
18 #define MSR_KVM_SYSTEM_TIME 0x12
20 #define KVM_MAX_MMU_OP_BATCH 32
22 /* Operations for KVM_HC_MMU_OP */
23 #define KVM_MMU_OP_WRITE_PTE 1
24 #define KVM_MMU_OP_FLUSH_TLB 2
25 #define KVM_MMU_OP_RELEASE_PT 3
27 /* Payload for KVM_HC_MMU_OP */
28 struct kvm_mmu_op_header {
33 struct kvm_mmu_op_write_pte {
34 struct kvm_mmu_op_header header;
39 struct kvm_mmu_op_flush_tlb {
40 struct kvm_mmu_op_header header;
43 struct kvm_mmu_op_release_pt {
44 struct kvm_mmu_op_header header;
49 #include <asm/processor.h>
51 extern void kvmclock_init(void);
54 /* This instruction is vmcall. On non-VT architectures, it will generate a
55 * trap that we will then rewrite to the appropriate instruction.
57 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
59 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
60 * instruction. The hypervisor may replace it with something else but only the
61 * instructions are guaranteed to be supported.
63 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
64 * The hypercall number should be placed in rax and the return value will be
65 * placed in rax. No other registers will be clobbered unless explicited
66 * noted by the particular hypercall.
69 static inline long kvm_hypercall0(unsigned int nr)
72 asm volatile(KVM_HYPERCALL
79 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
82 asm volatile(KVM_HYPERCALL
89 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
93 asm volatile(KVM_HYPERCALL
95 : "a"(nr), "b"(p1), "c"(p2)
100 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
101 unsigned long p2, unsigned long p3)
104 asm volatile(KVM_HYPERCALL
106 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
111 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
112 unsigned long p2, unsigned long p3,
116 asm volatile(KVM_HYPERCALL
118 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
123 static inline int kvm_para_available(void)
125 unsigned int eax, ebx, ecx, edx;
128 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
129 memcpy(signature + 0, &ebx, 4);
130 memcpy(signature + 4, &ecx, 4);
131 memcpy(signature + 8, &edx, 4);
134 if (strcmp(signature, "KVMKVMKVM") == 0)
140 static inline unsigned int kvm_arch_para_features(void)
142 return cpuid_eax(KVM_CPUID_FEATURES);