[Xen-devel] [PATCH v2 04/11] grant_table: avoid unnecessary work during grant table unmapping

[Quan Xu <quan.xu@xxxxxxxxx>]

While grant table is unmapping, the domain (with the exception of the
hardware domain) may be crashed due to IOMMU mapping and unmapping
failures, and then it is unnecessary to flush specified CPUs' TLBs.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>

CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
---
 xen/common/grant_table.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index 8b22299..1801fe9 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -1366,8 +1366,9 @@ gnttab_unmap_grant_ref(
      
     return 0;
 
-fault:
-    gnttab_flush_tlb(current->domain);
+ fault:
+    if ( current->domain->is_shut_down )
+        gnttab_flush_tlb(current->domain);
 
     for ( i = 0; i < partial_done; i++ )
         __gnttab_unmap_common_complete(&(common[i]));
@@ -1429,8 +1430,9 @@ gnttab_unmap_and_replace(
 
     return 0;
 
-fault:
-    gnttab_flush_tlb(current->domain);
+ fault:
+    if ( current->domain->is_shut_down )
+        gnttab_flush_tlb(current->domain);
 
     for ( i = 0; i < partial_done; i++ )
         __gnttab_unmap_common_complete(&(common[i]));
-- 
1.9.1


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