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