Re: [PATCH v3 03/12] KVM: arm64: selftests: Add support for cpu_relax
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From: Oliver Upton <hidden>
Date: 2021-09-01 22:10:20
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kvmarm, linux-arm-kernel, lkml
On Wed, Sep 01, 2021 at 09:14:03PM +0000, Raghavendra Rao Ananta wrote:
Implement the guest helper routine, cpu_relax(), to yield the processor to other tasks. The function was derived from arch/arm64/include/asm/vdso/processor.h. Signed-off-by: Raghavendra Rao Ananta <redacted>
Reviewed-by: Oliver Upton <redacted>
quoted hunk ↗ jump to hunk
--- tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++ 1 file changed, 5 insertions(+)diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index 082cc97ad8d3..78df059dc974 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h@@ -191,6 +191,11 @@ asm( val; \ }) +static inline void cpu_relax(void) +{ + asm volatile("yield" ::: "memory"); +} + #define isb() asm volatile("isb" : : : "memory") #define dsb(opt) asm volatile("dsb " #opt : : : "memory") #define dmb(opt) asm volatile("dmb " #opt : : : "memory")-- 2.33.0.153.gba50c8fa24-goog