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KVM: arm64: selftests: Add support for cpu_relax

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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>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-6-rananta@google.com
This commit is contained in:
Raghavendra Rao Ananta 2021-10-07 23:34:29 +00:00 committed by Marc Zyngier
parent b3c79c6130
commit 740826ec02
1 changed files with 5 additions and 0 deletions
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5
tools/testing/selftests/kvm/include/aarch64/processor.h
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@ -122,6 +122,11 @@ void vm_install_exception_handler(struct kvm_vm *vm,
void vm_install_sync_handler(struct kvm_vm *vm,
int vector, int ec, handler_fn handler);
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")