[Qemu-devel] [patch uq/master 2/2] kvm-all.c: define smp_wmb and use it for coalesced mmio

[Marcelo Tosatti]

Cc: "Michael S. Tsirkin" <m...@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

Index: qemu/kvm-all.c
===================================================================
--- qemu.orig/kvm-all.c
+++ qemu/kvm-all.c
@@ -718,6 +718,9 @@ static int kvm_handle_io(uint16_t port, 
     return 1;
 }
 
+/* FIXME: arch dependant, x86 version */
+#define smp_wmb()   asm volatile("" ::: "memory")
+
 void kvm_flush_coalesced_mmio_buffer(void)
 {
 #ifdef KVM_CAP_COALESCED_MMIO
@@ -730,7 +733,7 @@ void kvm_flush_coalesced_mmio_buffer(voi
             ent = &ring->coalesced_mmio[ring->first];
 
             cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
-            /* FIXME smp_wmb() */
+            smp_wmb();
             ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
         }
     }