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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_KVM_PARA_H #define _ASM_X86_KVM_PARA_H #include <asm/processor.h> #include <asm/alternative.h> #include <uapi/asm/kvm_para.h> #ifdef CONFIG_KVM_GUEST bool kvm_check_and_clear_guest_paused(void); #else static inline bool kvm_check_and_clear_guest_paused(void) { return false; } #endif /* CONFIG_KVM_GUEST */ #define KVM_HYPERCALL \ ALTERNATIVE(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9", X86_FEATURE_VMMCALL) /* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall * instruction. The hypervisor may replace it with something else but only the * instructions are guaranteed to be supported. * * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively. * The hypercall number should be placed in rax and the return value will be * placed in rax. No other registers will be clobbered unless explicitly * noted by the particular hypercall. */ static inline long kvm_hypercall0(unsigned int nr) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr) : "memory"); return ret; } static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1) : "memory"); return ret; } static inline long kvm_hypercall2(unsigned int nr, unsigned long p1, unsigned long p2) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2) : "memory"); return ret; } static inline long kvm_hypercall3(unsigned int nr, unsigned long p1, unsigned long p2, unsigned long p3) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2), "d"(p3) : "memory"); return ret; } static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, unsigned long p2, unsigned long p3, unsigned long p4) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4) : "memory"); return ret; } #ifdef CONFIG_KVM_GUEST void kvmclock_init(void); void kvmclock_disable(void); bool kvm_para_available(void); unsigned int kvm_arch_para_features(void); unsigned int kvm_arch_para_hints(void); void kvm_async_pf_task_wait(u32 token, int interrupt_kernel); void kvm_async_pf_task_wake(u32 token); u32 kvm_read_and_reset_pf_reason(void); void do_async_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address); #ifdef CONFIG_PARAVIRT_SPINLOCKS void __init kvm_spinlock_init(void); #else /* !CONFIG_PARAVIRT_SPINLOCKS */ static inline void kvm_spinlock_init(void) { } #endif /* CONFIG_PARAVIRT_SPINLOCKS */ #else /* CONFIG_KVM_GUEST */ #define kvm_async_pf_task_wait(T, I) do {} while(0) #define kvm_async_pf_task_wake(T) do {} while(0) static inline bool kvm_para_available(void) { return false; } static inline unsigned int kvm_arch_para_features(void) { return 0; } static inline unsigned int kvm_arch_para_hints(void) { return 0; } static inline u32 kvm_read_and_reset_pf_reason(void) { return 0; } #endif #endif /* _ASM_X86_KVM_PARA_H */
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