linux-kernel - [PATCH v3 10/10] xen: mask the MTRR feature from the cpuid

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Date:	Tue, 12 Oct 2010 17:42:50 +0100
From:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
To:	linux-kernel@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com, Jeremy.Fitzhardinge@...rix.com,
	konrad.wilk@...cle.com,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH v3 10/10] xen: mask the MTRR feature from the cpuid

From: Stefano Stabellini <stefano.stabellini@...citrix.com>

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@...citrix.com>
---
 arch/x86/xen/enlighten.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 9efb004..d48a32b 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -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())
-- 
1.5.6.5

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