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
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")