| Message ID | 20210901211412.4171835-4-rananta@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: arm64: selftests: Introduce arch_timer selftest | expand |
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 <rananta@google.com> Reviewed-by: Oliver Upton <oupton@google.com> > --- > 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 >
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 <rananta@google.com> Reviewed-by: Oliver Upton <oupton@google.com> > --- > 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 >
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 <rananta@google.com> > --- > tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++ > 1 file changed, 5 insertions(+) > Reviewed-by: Andrew Jones <drjones@redhat.com>
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")
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 <rananta@google.com> --- tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++ 1 file changed, 5 insertions(+)