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
86 #ifdef CONFIG_KVM_GUEST
87 void kvmclock_init(void);
88 void kvmclock_disable(void);
89 bool kvm_para_available(void);
90 unsigned int kvm_arch_para_features(void);
91 unsigned int kvm_arch_para_hints(void);
92 void kvm_async_pf_task_wait_schedule(u32 token);
93 void kvm_async_pf_task_wake(u32 token);
94 u32 kvm_read_and_reset_apf_flags(void);
95 bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
96
97 DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
98
kvm_handle_async_pf(struct pt_regs * regs,u32 token)99 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
100 {
101 if (static_branch_unlikely(&kvm_async_pf_enabled))
102 return __kvm_handle_async_pf(regs, token);
103 else
104 return false;
105 }
106
107 #ifdef CONFIG_PARAVIRT_SPINLOCKS
108 void __init kvm_spinlock_init(void);
109 #else /* !CONFIG_PARAVIRT_SPINLOCKS */
kvm_spinlock_init(void)110 static inline void kvm_spinlock_init(void)
111 {
112 }
113 #endif /* CONFIG_PARAVIRT_SPINLOCKS */
114
115 #else /* CONFIG_KVM_GUEST */
116 #define kvm_async_pf_task_wait_schedule(T) do {} while(0)
117 #define kvm_async_pf_task_wake(T) do {} while(0)
118
kvm_para_available(void)119 static inline bool kvm_para_available(void)
120 {
121 return false;
122 }
123
kvm_arch_para_features(void)124 static inline unsigned int kvm_arch_para_features(void)
125 {
126 return 0;
127 }
128
kvm_arch_para_hints(void)129 static inline unsigned int kvm_arch_para_hints(void)
130 {
131 return 0;
132 }
133
kvm_read_and_reset_apf_flags(void)134 static inline u32 kvm_read_and_reset_apf_flags(void)
135 {
136 return 0;
137 }
138
kvm_handle_async_pf(struct pt_regs * regs,u32 token)139 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
140 {
141 return false;
142 }
143 #endif
144
145 #endif /* _ASM_X86_KVM_PARA_H */
146
