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

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Date:   Wed, 11 Apr 2018 05:58:54 -0600
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "Ingo Molnar" <mingo@...nel.org>
Cc:     <x86@...nel.org>, <tglx@...utronix.de>,
        <xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
        <mingo@...hat.com>, "Juergen Gross" <jgross@...e.com>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH] x86/xen: zero MSR_IA32_SPEC_CTRL
 before suspend

>>> On 11.04.18 at 13:53, <mingo@...nel.org> wrote:
> * Jan Beulich <JBeulich@...e.com> wrote:
> 
>> Additionally, x86 maintainers: is there a particular reason this (or
>> any functionally equivalent patch) isn't upstream yet? As indicated
>> before, I had not been able to find any discussion, and hence I
>> see no reason why this is a patch we effectively carry privately in
>> our distro branches (and likely other distros do so too).
> 
> The patch was merged 6 weeks ago and is now upstream:
> 
>   71c208dd54ab: x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend

I'm sorry, but no, this isn't the patch I was inquiring about.
Instead I'm wondering of the disposition of the patch disabling
IBRS around a CPU going idle.

Jan