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Re: [Xen-devel] [PATCH] x86/xen: zero MSR_IA32_SPEC_CTRL before suspend

To: "Juergen Gross" <jgross@xxxxxxxx>
From: "Jan Beulich" <JBeulich@xxxxxxxx>
Date: Mon, 26 Feb 2018 09:17:16 -0700
Cc: x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx
Delivery-date: Mon, 26 Feb 2018 16:17:35 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

>>> On 26.02.18 at 15:08, <jgross@xxxxxxxx> wrote:
> Older Xen versions (4.5 and before) might have problems migrating pv
> guests with MSR_IA32_SPEC_CTRL having a non-zero value. So before
> suspending zero that MSR and restore it after being resumed.
> 
> Cc: stable@xxxxxxxxxxxxxxx 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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References:
- [Xen-devel] [PATCH] x86/xen: zero MSR_IA32_SPEC_CTRL before suspend
  - From: Juergen Gross

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