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Diffstat (limited to '')
| -rw-r--r-- | arch/x86/include/asm/kvm_para.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h new file mode 100644 index 000000000..57bc74e11 --- /dev/null +++ b/arch/x86/include/asm/kvm_para.h @@ -0,0 +1,179 @@ +/* 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 <linux/interrupt.h> +#include <uapi/asm/kvm_para.h> + +#include <asm/tdx.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("vmcall", "vmmcall", 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; + + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return tdx_kvm_hypercall(nr, 0, 0, 0, 0); + + asm volatile(KVM_HYPERCALL + : "=a"(ret) + : "a"(nr) + : "memory"); + return ret; +} + +static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) +{ + long ret; + + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return tdx_kvm_hypercall(nr, p1, 0, 0, 0); + + 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; + + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return tdx_kvm_hypercall(nr, p1, p2, 0, 0); + + 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; + + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return tdx_kvm_hypercall(nr, p1, p2, p3, 0); + + 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; + + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return tdx_kvm_hypercall(nr, p1, p2, p3, p4); + + asm volatile(KVM_HYPERCALL + : "=a"(ret) + : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4) + : "memory"); + return ret; +} + +static inline long kvm_sev_hypercall3(unsigned int nr, unsigned long p1, + unsigned long p2, unsigned long p3) +{ + long ret; + + asm volatile("vmmcall" + : "=a"(ret) + : "a"(nr), "b"(p1), "c"(p2), "d"(p3) + : "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_schedule(u32 token); +void kvm_async_pf_task_wake(u32 token); +u32 kvm_read_and_reset_apf_flags(void); +bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token); + +DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled); + +static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token) +{ + if (static_branch_unlikely(&kvm_async_pf_enabled)) + return __kvm_handle_async_pf(regs, token); + else + return false; +} + +#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_schedule(T) 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_apf_flags(void) +{ + return 0; +} + +static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token) +{ + return false; +} +#endif + +#endif /* _ASM_X86_KVM_PARA_H */ |