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xen: mask the MTRR feature from the cpuid

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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())