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 #define KVM_FEATURE_STEAL_TIME		5
25 
26 /* The last 8 bits are used to indicate how to interpret the flags field
27  * in pvclock structure. If no bits are set, all flags are ignored.
28  */
29 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT	24
30 
31 #define MSR_KVM_WALL_CLOCK  0x11
32 #define MSR_KVM_SYSTEM_TIME 0x12
33 
34 #define KVM_MSR_ENABLED 1
35 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
36 #define MSR_KVM_WALL_CLOCK_NEW  0x4b564d00
37 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
38 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
39 #define MSR_KVM_STEAL_TIME  0x4b564d03
40 
41 struct kvm_steal_time {
42 	__u64 steal;
43 	__u32 version;
44 	__u32 flags;
45 	__u32 pad[12];
46 };
47 
48 #define KVM_STEAL_ALIGNMENT_BITS 5
49 #define KVM_STEAL_VALID_BITS ((-1ULL << (KVM_STEAL_ALIGNMENT_BITS + 1)))
50 #define KVM_STEAL_RESERVED_MASK (((1 << KVM_STEAL_ALIGNMENT_BITS) - 1 ) << 1)
51 
52 #define KVM_MAX_MMU_OP_BATCH           32
53 
54 #define KVM_ASYNC_PF_ENABLED			(1 << 0)
55 #define KVM_ASYNC_PF_SEND_ALWAYS		(1 << 1)
56 
57 /* Operations for KVM_HC_MMU_OP */
58 #define KVM_MMU_OP_WRITE_PTE            1
59 #define KVM_MMU_OP_FLUSH_TLB	        2
60 #define KVM_MMU_OP_RELEASE_PT	        3
61 
62 /* Payload for KVM_HC_MMU_OP */
63 struct kvm_mmu_op_header {
64 	__u32 op;
65 	__u32 pad;
66 };
67 
68 struct kvm_mmu_op_write_pte {
69 	struct kvm_mmu_op_header header;
70 	__u64 pte_phys;
71 	__u64 pte_val;
72 };
73 
74 struct kvm_mmu_op_flush_tlb {
75 	struct kvm_mmu_op_header header;
76 };
77 
78 struct kvm_mmu_op_release_pt {
79 	struct kvm_mmu_op_header header;
80 	__u64 pt_phys;
81 };
82 
83 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1
84 #define KVM_PV_REASON_PAGE_READY 2
85 
86 struct kvm_vcpu_pv_apf_data {
87 	__u32 reason;
88 	__u8 pad[60];
89 	__u32 enabled;
90 };
91 
92 #ifdef __KERNEL__
93 #include <asm/processor.h>
94 
95 extern void kvmclock_init(void);
96 extern int kvm_register_clock(char *txt);
97 
98 
99 /* This instruction is vmcall.  On non-VT architectures, it will generate a
100  * trap that we will then rewrite to the appropriate instruction.
101  */
102 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
103 
104 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
105  * instruction.  The hypervisor may replace it with something else but only the
106  * instructions are guaranteed to be supported.
107  *
108  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
109  * The hypercall number should be placed in rax and the return value will be
110  * placed in rax.  No other registers will be clobbered unless explicited
111  * noted by the particular hypercall.
112  */
113 
kvm_hypercall0(unsigned int nr)114 static inline long kvm_hypercall0(unsigned int nr)
115 {
116 	long ret;
117 	asm volatile(KVM_HYPERCALL
118 		     : "=a"(ret)
119 		     : "a"(nr)
120 		     : "memory");
121 	return ret;
122 }
123 
kvm_hypercall1(unsigned int nr,unsigned long p1)124 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
125 {
126 	long ret;
127 	asm volatile(KVM_HYPERCALL
128 		     : "=a"(ret)
129 		     : "a"(nr), "b"(p1)
130 		     : "memory");
131 	return ret;
132 }
133 
kvm_hypercall2(unsigned int nr,unsigned long p1,unsigned long p2)134 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
135 				  unsigned long p2)
136 {
137 	long ret;
138 	asm volatile(KVM_HYPERCALL
139 		     : "=a"(ret)
140 		     : "a"(nr), "b"(p1), "c"(p2)
141 		     : "memory");
142 	return ret;
143 }
144 
kvm_hypercall3(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3)145 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
146 				  unsigned long p2, unsigned long p3)
147 {
148 	long ret;
149 	asm volatile(KVM_HYPERCALL
150 		     : "=a"(ret)
151 		     : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
152 		     : "memory");
153 	return ret;
154 }
155 
kvm_hypercall4(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3,unsigned long p4)156 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
157 				  unsigned long p2, unsigned long p3,
158 				  unsigned long p4)
159 {
160 	long ret;
161 	asm volatile(KVM_HYPERCALL
162 		     : "=a"(ret)
163 		     : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
164 		     : "memory");
165 	return ret;
166 }
167 
kvm_para_available(void)168 static inline int kvm_para_available(void)
169 {
170 	unsigned int eax, ebx, ecx, edx;
171 	char signature[13];
172 
173 	if (boot_cpu_data.cpuid_level < 0)
174 		return 0;	/* So we don't blow up on old processors */
175 
176 	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
177 	memcpy(signature + 0, &ebx, 4);
178 	memcpy(signature + 4, &ecx, 4);
179 	memcpy(signature + 8, &edx, 4);
180 	signature[12] = 0;
181 
182 	if (strcmp(signature, "KVMKVMKVM") == 0)
183 		return 1;
184 
185 	return 0;
186 }
187 
kvm_arch_para_features(void)188 static inline unsigned int kvm_arch_para_features(void)
189 {
190 	return cpuid_eax(KVM_CPUID_FEATURES);
191 }
192 
193 #ifdef CONFIG_KVM_GUEST
194 void __init kvm_guest_init(void);
195 void kvm_async_pf_task_wait(u32 token);
196 void kvm_async_pf_task_wake(u32 token);
197 u32 kvm_read_and_reset_pf_reason(void);
198 extern void kvm_disable_steal_time(void);
199 #else
200 #define kvm_guest_init() do { } while (0)
201 #define kvm_async_pf_task_wait(T) do {} while(0)
202 #define kvm_async_pf_task_wake(T) do {} while(0)
kvm_read_and_reset_pf_reason(void)203 static inline u32 kvm_read_and_reset_pf_reason(void)
204 {
205 	return 0;
206 }
207 
kvm_disable_steal_time(void)208 static inline void kvm_disable_steal_time(void)
209 {
210 	return;
211 }
212 #endif
213 
214 #endif /* __KERNEL__ */
215 
216 #endif /* _ASM_X86_KVM_PARA_H */
217