* [PATCH v2] pvh: disable MTRR feature on cpuid for Dom0
@ 2013-12-13 17:16 Roger Pau Monne
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From: Roger Pau Monne @ 2013-12-13 17:16 UTC (permalink / raw)
To: xen-devel; +Cc: George Dunlap, Keir Fraser, Jan Beulich, Roger Pau Monne
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@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Mukesh Rathor <mukesh.rathor@oracle.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Keir Fraser <keir@xen.org>
---
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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