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