[Xen-devel] [PATCH 2/3] xen/p2m: avoid unneccesary TLB flush in m2p_remove_override()

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

In m2p_remove_override() when removing the grant map from the kernel
mapping and replacing with a mapping to the original page, the grant
unmap will already have flushed the TLB and it is not necessary to do
it again after updating the mapping.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/x86/xen/p2m.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 95fb2aa..74672ee 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -1003,7 +1003,6 @@ int m2p_remove_override(struct page *page,
 
                        set_pte_at(&init_mm, address, ptep,
                                        pfn_pte(pfn, PAGE_KERNEL));
-                       __flush_tlb_single(address);
                        kmap_op->host_addr = 0;
                }
        }
-- 
1.7.2.5


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel