[Xen-changelog] [xen master] x86/pvh: disable MTRR feature on cpuid for Dom0

[patchbot@xxxxxxx]

commit 586ab6a055376ec3f3e1e82654eb87481005bc21
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Dec 16 10:52:43 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Dec 16 10:52:43 2013 +0100

    x86/pvh: disable MTRR feature on cpuid for Dom0
    
    MTRR is not available for PVH Dom0, so prevent cpuid from
    reporting it as an available feature.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/traps.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 940bc33..3f7a3c7 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -796,6 +796,8 @@ void pv_cpuid(struct cpu_user_regs *regs)
         __clear_bit(X86_FEATURE_DS, &d);
         __clear_bit(X86_FEATURE_ACC, &d);
         __clear_bit(X86_FEATURE_PBE, &d);
+        if ( is_pvh_vcpu(current) )
+            __clear_bit(X86_FEATURE_MTRR, &d);
 
         __clear_bit(X86_FEATURE_DTES64 % 32, &c);
         __clear_bit(X86_FEATURE_MWAIT % 32, &c);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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