1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KVM_PARA_H
3 #define _ASM_X86_KVM_PARA_H
5 #include <asm/processor.h>
6 #include <asm/alternative.h>
7 #include <linux/interrupt.h>
8 #include <uapi/asm/kvm_para.h>
10 extern void kvmclock_init(void);
12 #ifdef CONFIG_KVM_GUEST
13 bool kvm_check_and_clear_guest_paused(void);
15 static inline bool kvm_check_and_clear_guest_paused(void)
19 #endif /* CONFIG_KVM_GUEST */
21 #define KVM_HYPERCALL \
22 ALTERNATIVE(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9", X86_FEATURE_VMMCALL)
24 /* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall
25 * instruction. The hypervisor may replace it with something else but only the
26 * instructions are guaranteed to be supported.
28 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
29 * The hypercall number should be placed in rax and the return value will be
30 * placed in rax. No other registers will be clobbered unless explicitly
31 * noted by the particular hypercall.
34 static inline long kvm_hypercall0(unsigned int nr)
37 asm volatile(KVM_HYPERCALL
44 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
47 asm volatile(KVM_HYPERCALL
54 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
58 asm volatile(KVM_HYPERCALL
60 : "a"(nr), "b"(p1), "c"(p2)
65 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
66 unsigned long p2, unsigned long p3)
69 asm volatile(KVM_HYPERCALL
71 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
76 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
77 unsigned long p2, unsigned long p3,
81 asm volatile(KVM_HYPERCALL
83 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
88 #ifdef CONFIG_KVM_GUEST
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 void kvm_disable_steal_time(void);
96 bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
98 DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
100 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
102 if (static_branch_unlikely(&kvm_async_pf_enabled))
103 return __kvm_handle_async_pf(regs, token);
108 #ifdef CONFIG_PARAVIRT_SPINLOCKS
109 void __init kvm_spinlock_init(void);
110 #else /* !CONFIG_PARAVIRT_SPINLOCKS */
111 static inline void kvm_spinlock_init(void)
114 #endif /* CONFIG_PARAVIRT_SPINLOCKS */
116 #else /* CONFIG_KVM_GUEST */
117 #define kvm_async_pf_task_wait_schedule(T) do {} while(0)
118 #define kvm_async_pf_task_wake(T) do {} while(0)
120 static inline bool kvm_para_available(void)
125 static inline unsigned int kvm_arch_para_features(void)
130 static inline unsigned int kvm_arch_para_hints(void)
135 static inline u32 kvm_read_and_reset_apf_flags(void)
140 static inline void kvm_disable_steal_time(void)
145 static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
151 #endif /* _ASM_X86_KVM_PARA_H */