[Xen-devel] [PATCH v2] pvh: disable MTRR feature on cpuid for Dom0

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

MTRR is not available for PVH Dom0, so prevent cpuid from
reporting it as an available feature.

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Cc: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
---
This should go in after Mukesh Dom0 series, or merged into it.
---
 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);
-- 
1.7.7.5 (Apple Git-26)


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