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Re: [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32_APICBASE is not set

To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, <david.vrabel@xxxxxxxxxx>, <konrad.wilk@xxxxxxxxxx>
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Thu, 19 Feb 2015 14:14:40 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Delivery-date: Thu, 19 Feb 2015 14:15:25 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

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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References:
- [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32_APICBASE is not set
  - From: Boris Ostrovsky

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