[Xen-changelog] [xen-unstable] VT-d code cleanup

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1228474781 0
# Node ID 99f01b8184c7c16f612731e2a525687dc8d424dc
# Parent  09160c3bd1797fdee111c2837f26a749e0bf9435
VT-d code cleanup

This patch narrow context caching flush range from the
domain-selective to the device-selective, when unmapping a device.

Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -r 09160c3bd179 -r 99f01b8184c7 xen/drivers/passthrough/vtd/iommu.c
--- a/xen/drivers/passthrough/vtd/iommu.c       Fri Dec 05 15:47:19 2008 +0900
+++ b/xen/drivers/passthrough/vtd/iommu.c       Fri Dec 05 10:59:41 2008 +0000
@@ -1308,7 +1308,9 @@ static int domain_context_unmap_one(
     context_clear_entry(*context);
     iommu_flush_cache_entry(context);
 
-    if ( iommu_flush_context_domain(iommu, domain_iommu_domid(domain), 0) )
+    if ( iommu_flush_context_device(iommu, domain_iommu_domid(domain),
+                                    (((u16)bus) << 8) | devfn,
+                                    DMA_CCMD_MASK_NOBIT, 0) )
         iommu_flush_write_buffer(iommu);
     else
         iommu_flush_iotlb_dsi(iommu, domain_iommu_domid(domain), 0);

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