linux-kernel - Re: [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32

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Date:	Thu, 19 Feb 2015 14:14:40 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<david.vrabel@...rix.com>, <konrad.wilk@...cle.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32_APICBASE
 is not set

On 11/02/15 19:39, Boris Ostrovsky wrote:
> Commit d524165cb8db ("x86/apic: Check x2apic early") tests X2APIC_ENABLE
> bit of MSR_IA32_APICBASE when CONFIG_X86_X2APIC is off and panics
> the kernel when this bit is set.
> 
> Xen's PV guests will pass this MSR read to the hypervisor which will
> return its version of the MSR, where this bit might be set. Make sure
> we clear it before returning MSR value to the caller.

Applied to stable/for-linus-3.20, thanks.

David
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