From 5eba0404b98294906134c06519c272bfb5f50453 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 27 Jan 2017 16:40:16 +0100
Subject: virtio: use MemoryRegionCache to access descriptors

For now, the cache is created on every virtqueue_pop.  Later on,
direct descriptors will be able to reuse it.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/exec/memory.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include/exec')

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 987f925..6911023 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1426,6 +1426,8 @@ struct MemoryRegionCache {
     bool is_write;
 };
 
+#define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .mr = NULL })
+
 /* address_space_cache_init: prepare for repeated access to a physical
  * memory region
  *
-- 
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