[Xen-changelog] [xen-unstable] [IA64] fix to translate_phy_pte()

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
# Date 1224816449 -32400
# Node ID c19871b66cea01eeb5d67352e4251f43f50bf1e1
# Parent  7ad8c47f5c4b5ef43ec71cb946c39b08eeac3d18
[IA64] fix to translate_phy_pte()

mfn_valid makes sure whether the pfn in question is a normal page.

Signed-off-by: Anthony Xu <anthony.xu@xxxxxxxxx>
---
 xen/arch/ia64/vmx/vtlb.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 7ad8c47f5c4b -r c19871b66cea xen/arch/ia64/vmx/vtlb.c
--- a/xen/arch/ia64/vmx/vtlb.c  Fri Oct 24 11:38:09 2008 +0900
+++ b/xen/arch/ia64/vmx/vtlb.c  Fri Oct 24 11:47:29 2008 +0900
@@ -522,7 +522,7 @@ static u64 translate_phy_pte(VCPU *v, u6
      * which is required by vga acceleration since qemu maps shared
      * vram buffer with WB.
      */
-    if (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);

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