Flush icache after dma operations for ia64

ia64 system depends on that platform issues snoop cycle to flush
icache for memory touched by DMA write operations, but virtual DMA
operations is emulated by memcpy, so use explict instrustions to flush
the related icache, otherwise, guest may use obsolete icache.

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/cutils.c b/cutils.c
index 0623cf70d..6ea0c4962 100644
--- a/cutils.c
+++ b/cutils.c
@@ -164,6 +164,11 @@ void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
     }
 }
 
+/*
+ * No dma flushing needed here, as the aio code will call dma_bdrv_cb()
+ * on completion as well, which will result in a call to
+ * dma_bdrv_unmap() which will do the flushing ....
+ */
 void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
 {
     const uint8_t *p = (const uint8_t *)buf;