clflush is a light weight but not serializing instruction, so
hence memory fence is necessary to make sure all load/store
visible before flush cache line.
Signed-off-by: Tiejun Chen <tiejun.c...@intel.com>
---
xen/drivers/passthrough/vtd/x86/vtd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/xen/drivers/passthrough/vtd/x86/vtd.c
b/xen/drivers/passthrough/vtd/x86/vtd.c
index 109234e..fd2ff04 100644
--- a/xen/drivers/passthrough/vtd/x86/vtd.c
+++ b/xen/drivers/passthrough/vtd/x86/vtd.c
@@ -56,7 +56,9 @@ unsigned int get_cache_line_size(void)
void cacheline_flush(char * addr)
{
+ mb();
clflush(addr);
+ mb();
}
void flush_all_cache()
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
