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

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

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220226001546.360188-28-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-02-26 00:15:45 +00:00 committed by Paolo Bonzini
parent a4187c9bd1
commit 17ae5ebc46
2 changed files with 13 additions and 0 deletions
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8
tools/testing/selftests/kvm/include/s390x/processor.h
View file

@ -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

5
tools/testing/selftests/kvm/include/x86_64/processor.h
View file

@ -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);