qemu/qemu-barrier.h

#ifndef __QEMU_BARRIER_H
#define __QEMU_BARRIER_H 1

/* FIXME: arch dependant, x86 version */
#define smp_wmb()   asm volatile("" ::: "memory")

/* Compiler barrier */
#define barrier()   asm volatile("" ::: "memory")

#endif
kvm-all.c: define smp_wmb and use it for coalesced mmio Acked-by: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com> 2010-02-22 13:57:54 -03:00			`#ifndef __QEMU_BARRIER_H`
			`#define __QEMU_BARRIER_H 1`

			`/* FIXME: arch dependant, x86 version */`
			`#define smp_wmb() asm volatile("" ::: "memory")`

Introduce proper compiler barrier Define barrier() as optimization barrier and replace (potentially unreliable) asm("") fences. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> 2010-06-25 16:56:49 +02:00			`/* Compiler barrier */`
			`#define barrier() asm volatile("" ::: "memory")`

kvm-all.c: define smp_wmb and use it for coalesced mmio Acked-by: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com> 2010-02-22 13:57:54 -03:00			`#endif`