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xen: mask the MTRR feature from the cpuid 

We don't want Linux to think that the cpu supports MTRRs when running
under Xen because MTRR operations could only be performed through
hypercalls.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2010-09-28 16:45:51 +01:00
parent 4fe7d5a708
commit ff12849a7a
1 changed files with 1 additions and 0 deletions
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arch/x86/xen/enlighten.c
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@ -243,6 +243,7 @@ static __init void xen_init_cpuid_mask(void)
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
(1 << X86_FEATURE_MCA) | /* disable MCA */
(1 << X86_FEATURE_MTRR) | /* disable MTRR */
(1 << X86_FEATURE_ACC)); /* thermal monitoring */
if (!xen_initial_domain())