[Xen-devel] [PATCH] VT-d code cleanup

["Zhao, Yu" <yu.zhao@xxxxxxxxx>]

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>

diff -r f39673ce7d6e xen/drivers/passthrough/vtd/iommu.c
--- a/xen/drivers/passthrough/vtd/iommu.c       Mon Dec 01 13:45:46 2008 +0000
+++ b/xen/drivers/passthrough/vtd/iommu.c       Tue Dec 02 06:27:02 2008 -0500
@@ -1308,7 +1308,9 @@
     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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