linux-kernel - Re: [PATCH] x86/xen: zero MSR_IA32_SPEC

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Message-Id: <5A94411C02000078001ABDF1@prv-mh.provo.novell.com>
Date:   Mon, 26 Feb 2018 09:17:16 -0700
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "Juergen Gross" <jgross@...e.com>
Cc:     <x86@...nel.org>, <tglx@...utronix.de>,
        <xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
        <mingo@...hat.com>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [PATCH] x86/xen: zero MSR_IA32_SPEC_CTRL before suspend

>>> On 26.02.18 at 15:08, <jgross@...e.com> 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@...r.kernel.org 
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Jan Beulich <jbeulich@...e.com>