1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KVM_PARA_H
3 #define _ASM_X86_KVM_PARA_H
4
5 #include <asm/processor.h>
6 #include <asm/alternative.h>
7 #include <linux/interrupt.h>
8 #include <uapi/asm/kvm_para.h>
9
10 #ifdef CONFIG_KVM_GUEST
11 bool kvm_check_and_clear_guest_paused(void);
12 #else
kvm_check_and_clear_guest_paused(void)13 static inline bool kvm_check_and_clear_guest_paused(void)
14 {
15 return false;
16 }
17 #endif /* CONFIG_KVM_GUEST */
18
19 #define KVM_HYPERCALL \
20 ALTERNATIVE("vmcall", "vmmcall", X86_FEATURE_VMMCALL)
21
22 /* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall
23 * instruction. The hypervisor may replace it with something else but only the
24 * instructions are guaranteed to be supported.
25 *
26 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
27 * The hypercall number should be placed in rax and the return value will be
28 * placed in rax. No other registers will be clobbered unless explicitly
29 * noted by the particular hypercall.
30 */
31
kvm_hypercall0(unsigned int nr)32 static inline long kvm_hypercall0(unsigned int nr)
33 {
34 long ret;
35 asm volatile(KVM_HYPERCALL
36 : "=a"(ret)
37 : "a"(nr)
38 : "memory");
39 return ret;
40 }
41
kvm_hypercall1(unsigned int nr,unsigned long p1)42 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
43 {
44 long ret;
45 asm volatile(KVM_HYPERCALL
46 : "=a"(ret)
47 : "a"(nr), "b"(p1)
48 : "memory");
49 return ret;
50 }
51
kvm_hypercall2(unsigned int nr,unsigned long p1,unsigned long p2)52 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
53 unsigned long p2)
54 {
55 long ret;
56 asm volatile(KVM_HYPERCALL
57 : "=a"(ret)
58 : "a"(nr), "b"(p1), "c"(p2)
59 : "memory");
60 return ret;
61 }
62
kvm_hypercall3(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3)63 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
64 unsigned long p2, unsigned long p3)
65 {
66 long ret;
67 asm volatile(KVM_HYPERCALL
68 : "=a"(ret)
69 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
70 : "memory");
71 return ret;
72 }
73
kvm_hypercall4(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3,unsigned long p4)74 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
75 unsigned long p2, unsigned long p3,
76 unsigned long p4)
77 {
78 long ret;
79 asm volatile(KVM_HYPERCALL
80 : "=a"(ret)
81 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
82 : "memory");
83 return ret;
84 }
85
kvm_sev_hypercall3(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3)86 static inline long kvm_sev_hypercall3(unsigned int nr, unsigned long p1,
87 unsigned long p2, unsigned long p3)
88 {
89 long ret;
90
91 asm volatile("vmmcall"
92 : "=a"(ret)
93 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
94 : "memory");
95 return ret;
96 }
97
98 #ifdef CONFIG_KVM_GUEST
99 void kvmclock_init(void);
100 void kvmclock_disable(void);
101 bool kvm_para_available(void);
102 unsigned int kvm_arch_para_features(void);
103 unsigned int kvm_arch_para_hints(void);
104 void kvm_async_pf_task_wait_schedule(u32 token);
105 void kvm_async_pf_task_wake(u32 token);
106 u32 kvm_read_and_reset_apf_flags(void);
107 bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
108
109 DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
110
kvm_handle_async_pf(struct pt_regs * regs,u32 token)111 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
112 {
113 if (static_branch_unlikely(&kvm_async_pf_enabled))
114 return __kvm_handle_async_pf(regs, token);
115 else
116 return false;
117 }
118
119 #ifdef CONFIG_PARAVIRT_SPINLOCKS
120 void __init kvm_spinlock_init(void);
121 #else /* !CONFIG_PARAVIRT_SPINLOCKS */
kvm_spinlock_init(void)122 static inline void kvm_spinlock_init(void)
123 {
124 }
125 #endif /* CONFIG_PARAVIRT_SPINLOCKS */
126
127 #else /* CONFIG_KVM_GUEST */
128 #define kvm_async_pf_task_wait_schedule(T) do {} while(0)
129 #define kvm_async_pf_task_wake(T) do {} while(0)
130
kvm_para_available(void)131 static inline bool kvm_para_available(void)
132 {
133 return false;
134 }
135
kvm_arch_para_features(void)136 static inline unsigned int kvm_arch_para_features(void)
137 {
138 return 0;
139 }
140
kvm_arch_para_hints(void)141 static inline unsigned int kvm_arch_para_hints(void)
142 {
143 return 0;
144 }
145
kvm_read_and_reset_apf_flags(void)146 static inline u32 kvm_read_and_reset_apf_flags(void)
147 {
148 return 0;
149 }
150
kvm_handle_async_pf(struct pt_regs * regs,u32 token)151 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
152 {
153 return false;
154 }
155 #endif
156
157 #endif /* _ASM_X86_KVM_PARA_H */
158