[Xen-changelog] [xen stable-4.4] x86/EPT: relax treatment of APIC MFN

[patchbot@xxxxxxx]

commit aa538fe0fcede95b17fa11bc008395159aa87a89
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Apr 4 10:44:56 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Apr 4 10:44:56 2014 +0200

    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>
    master commit: 1f8b57779785bf9f55c16312bb1ec679929c314b
    master date: 2014-03-28 13:43:25 +0100
---
 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 bf8bdc5..e13647c 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -711,8 +711,12 @@ 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#stable-4.4

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