From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 5 Dec 2008 10:59:41 +0000 (+0000)
Subject: VT-d code cleanup
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14026^2~71
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=112495f91da6147d1c65169bd63540dc1a6511ec;p=xen.git

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@intel.com>
---

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index ba0ec4d205..aa07b52827 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -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);