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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/x86/include/asm/kvm_para.h
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@@ -4,9 +4,8 @@
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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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-
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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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@@ -18,7 +17,7 @@
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 #endif /* CONFIG_KVM_GUEST */
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 #define KVM_HYPERCALL \
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-        ALTERNATIVE(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9", X86_FEATURE_VMMCALL)
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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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@@ -85,13 +84,25 @@
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 }
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 #ifdef CONFIG_KVM_GUEST
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+void kvmclock_init(void);
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+void kvmclock_disable(void);
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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(u32 token, int interrupt_kernel);
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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_pf_reason(void);
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-extern void kvm_disable_steal_time(void);
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+u32 kvm_read_and_reset_apf_flags(void);
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+bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
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+
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+DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
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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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+	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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@@ -102,7 +113,7 @@
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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(T, I) do {} while(0)
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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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@@ -120,14 +131,14 @@
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 	return 0;
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 }
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-static inline u32 kvm_read_and_reset_pf_reason(void)
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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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+static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
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 {
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-	return;
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+	return false;
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 }
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 #endif
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