[Xen-changelog] [xen master] x86/EPT: relax treatment of APIC MFN

[patchbot@xxxxxxx]

commit 1f8b57779785bf9f55c16312bb1ec679929c314b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Mar 28 13:43:25 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Mar 28 13:43:25 2014 +0100

    x86/EPT: relax treatment of APIC MFN
    
    There's no point in this being mapped UC by the guest due to using a
    respective PAT index - set the ignore-PAT flag to true.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/x86/hvm/mtrr.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index 170c8c1..df52a54 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -719,8 +719,12 @@ uint8_t epte_get_entry_emt(struct domain *d, unsigned long 
gfn, mfn_t mfn,
     }
 
     if ( direct_mmio )
-        return mfn_x(mfn) != d->arch.hvm_domain.vmx.apic_access_mfn
-               ? MTRR_TYPE_UNCACHABLE : MTRR_TYPE_WRBACK;
+    {
+        if ( mfn_x(mfn) != d->arch.hvm_domain.vmx.apic_access_mfn )
+            return MTRR_TYPE_UNCACHABLE;
+        *ipat = 1;
+        return MTRR_TYPE_WRBACK;
+    }
 
     if ( iommu_snoop )
     {
--
generated by git-patchbot for /home/xen/git/xen.git#master

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