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2823e83a3d
vmlinux.o: warning: objtool: exc_page_fault()+0x9: call to read_cr2() leaves .noinstr.text section vmlinux.o: warning: objtool: exc_page_fault()+0x24: call to prefetchw() leaves .noinstr.text section vmlinux.o: warning: objtool: exc_page_fault()+0x21: call to kvm_handle_async_pf.isra.0() leaves .noinstr.text section vmlinux.o: warning: objtool: exc_nmi()+0x1cc: call to write_cr2() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200603114052.243227806@infradead.org
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/* 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 <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(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9", 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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