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
23 #define KVM_FEATURE_ASYNC_PF 4
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.
28 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 24
30 #define MSR_KVM_WALL_CLOCK 0x11
31 #define MSR_KVM_SYSTEM_TIME 0x12
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
38 #define KVM_MAX_MMU_OP_BATCH 32
40 #define KVM_ASYNC_PF_ENABLED (1 << 0)
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
47 /* Payload for KVM_HC_MMU_OP */
48 struct kvm_mmu_op_header {
53 struct kvm_mmu_op_write_pte {
54 struct kvm_mmu_op_header header;
59 struct kvm_mmu_op_flush_tlb {
60 struct kvm_mmu_op_header header;
63 struct kvm_mmu_op_release_pt {
64 struct kvm_mmu_op_header header;
69 #include <asm/processor.h>
71 extern void kvmclock_init(void);
72 extern int kvm_register_clock(char *txt);
75 /* This instruction is vmcall. On non-VT architectures, it will generate a
76 * trap that we will then rewrite to the appropriate instruction.
78 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
80 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
81 * instruction. The hypervisor may replace it with something else but only the
82 * instructions are guaranteed to be supported.
84 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
85 * The hypercall number should be placed in rax and the return value will be
86 * placed in rax. No other registers will be clobbered unless explicited
87 * noted by the particular hypercall.
90 static inline long kvm_hypercall0(unsigned int nr)
93 asm volatile(KVM_HYPERCALL
100 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
103 asm volatile(KVM_HYPERCALL
110 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
114 asm volatile(KVM_HYPERCALL
116 : "a"(nr), "b"(p1), "c"(p2)
121 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
122 unsigned long p2, unsigned long p3)
125 asm volatile(KVM_HYPERCALL
127 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
132 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
133 unsigned long p2, unsigned long p3,
137 asm volatile(KVM_HYPERCALL
139 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
144 static inline int kvm_para_available(void)
146 unsigned int eax, ebx, ecx, edx;
149 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
150 memcpy(signature + 0, &ebx, 4);
151 memcpy(signature + 4, &ecx, 4);
152 memcpy(signature + 8, &edx, 4);
155 if (strcmp(signature, "KVMKVMKVM") == 0)
161 static inline unsigned int kvm_arch_para_features(void)
163 return cpuid_eax(KVM_CPUID_FEATURES);
166 #ifdef CONFIG_KVM_GUEST
167 void __init kvm_guest_init(void);
169 #define kvm_guest_init() do { } while (0)
172 #endif /* __KERNEL__ */
174 #endif /* _ASM_X86_KVM_PARA_H */