[Xen-ia64-devel] PATCH: Fix an memory attribute issue.

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

PATCH: Fix an memory attribute issue. 

We should ensure Qemu and Guest use same attribute for accessing
the VGA ram, otherwise, host may hang.
Signed-off-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>

diff -r a6b1be5a83de xen/arch/ia64/vmx/vtlb.c
--- a/xen/arch/ia64/vmx/vtlb.c  Wed Oct 29 11:02:23 2008 +0900
+++ b/xen/arch/ia64/vmx/vtlb.c  Wed Oct 29 16:14:34 2008 +0800
@@ -522,7 +522,7 @@
      * which is required by vga acceleration since qemu maps shared
      * vram buffer with WB.
      */
-    if (mfn_valid(maddr >> PAGE_SHIFT) && phy_pte.ma == VA_MATTR_NATPAGE)
+    if (mfn_valid(maddr >> PAGE_SHIFT) && phy_pte.ma != VA_MATTR_NATPAGE)
         phy_pte.ma = VA_MATTR_WB;
 
     maddr = ((maddr & _PAGE_PPN_MASK) & PAGE_MASK) | (paddr & ~PAGE_MASK);

Attachment: mem_attr_fix.patch
Description: mem_attr_fix.patch

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