Commit 17ae5ebc authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: selftests: Define cpu_relax() helpers for s390 and x86 



Add cpu_relax() for s390 and x86 for use in arch-agnostic tests.  arm64
already defines its own version.

Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20220226001546.360188-28-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a4187c9b

tools/testing/selftests/kvm/include/s390x/processor.h

+8 −0
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 
#ifndef SELFTEST_KVM_PROCESSOR_H

#define SELFTEST_KVM_PROCESSOR_H



#include <linux/compiler.h>



/* Bits in the region/segment table entry */

#define REGION_ENTRY_ORIGIN	~0xfffUL /* region/segment table origin	   */

#define REGION_ENTRY_PROTECT	0x200	 /* region protection bit	   */
@@ -19,4 +21,10 @@ 
#define PAGE_PROTECT	0x200		/* HW read-only bit  */

#define PAGE_NOEXEC	0x100		/* HW no-execute bit */



/* Is there a portable way to do this? */

static inline void cpu_relax(void)

{

	barrier();

}



#endif

tools/testing/selftests/kvm/include/x86_64/processor.h

+5 −0
Original line number Diff line number Diff line
@@ -363,6 +363,11 @@ static inline unsigned long get_xmm(int n) 
	return 0;

}



static inline void cpu_relax(void)

{

	asm volatile("rep; nop" ::: "memory");

}



bool is_intel_cpu(void);

bool is_amd_cpu(void);