Release 4.14 arch/x86/include/asm/kvm_para.h

/* 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>

extern void kvmclock_init(void);
extern int kvm_register_clock(char *txt);

#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;
}
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#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;
}

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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;
}

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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;
}

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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;
}

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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;
}

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#ifdef CONFIG_KVM_GUEST
bool kvm_para_available(void);
unsigned int kvm_arch_para_features(void);
void __init kvm_guest_init(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);
extern void kvm_disable_steal_time(void);

#ifdef CONFIG_PARAVIRT_SPINLOCKS
void __init kvm_spinlock_init(void);
#else /* !CONFIG_PARAVIRT_SPINLOCKS */


static inline void kvm_spinlock_init(void)
{
}
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#endif /* CONFIG_PARAVIRT_SPINLOCKS */

#else /* CONFIG_KVM_GUEST */

#define kvm_guest_init() do {} while (0)

#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;
}

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static inline unsigned int kvm_arch_para_features(void)
{
	return 0;
}

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static inline u32 kvm_read_and_reset_pf_reason(void)
{
	return 0;
}

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static inline void kvm_disable_steal_time(void)
{
	return;
}
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#endif

#endif /* _ASM_X86_KVM_PARA_H */
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Directory: arch/x86/include/asm

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