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Re: [qemu-s390x] [Qemu-devel] [PULL 0/8] x86 queue, 2018-01-17

From: Christian Ehrhardt
Subject: Re: [qemu-s390x] [Qemu-devel] [PULL 0/8] x86 queue, 2018-01-17
Date: Tue, 23 Jan 2018 11:34:18 +0100

On Tue, Jan 23, 2018 at 10:59 AM, Christian Borntraeger
<address@hidden> wrote:
> On 01/23/2018 09:40 AM, Christian Ehrhardt wrote:
>> On Thu, Jan 18, 2018 at 2:51 PM, Peter Maydell <address@hidden> wrote:
>>> On 18 January 2018 at 02:01, Eduardo Habkost <address@hidden> wrote:
>>>> The following changes since commit 
>>>> 8e5dc9ba49743b46d955ec7dacb04e42ae7ada7c:
>>>>   Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20180116' into 
>>>> staging (2018-01-16 17:36:39 +0000)
>>>> are available in the Git repository at:
>>>>   git://github.com/ehabkost/qemu.git tags/x86-pull-request
>>>> for you to fetch changes up to 6cfbc54e8903a9bcc0346119949162d040c144c1:
>>>>   i386: Add EPYC-IBPB CPU model (2018-01-17 23:54:39 -0200)
>>>> ----------------------------------------------------------------
>>>> x86 queue, 2018-01-17
>>>> Highlight: new CPU models that expose CPU features that guests
>>>> can use to mitigate CVE-2017-5715 (Spectre variant #2).
>>> Applied, thanks.
>>> -- PMM
>> Hi,
>> I was kind of clinging to [1] so far and had the expectation that all
>> those would be wrapped up in 2.11.1 once ready.
>> I see that the s390x changes are targeted to qemu-stable (well to
>> admit I suggested so referring the article above).
>> So I'd expected to see this series to show up on qemu-stable as well
>> but haven't seen it so far.
>> Therefore I wanted to ask if there was a change of plans in that
>> regard or if it needs just a few days more to see (part of) this
>> series on qemu-stable and on its way into 2.11.1?
>> [1]: https://www.qemu.org/2018/01/04/spectre/
> Adding Michael,
> Yes, I think it makes sense to have the guest enablement for the spectre
> mitigations available in 2.11.1 for all architectures that provide it.
> (this queue for x86, Connies pending S390 patches, whatever Power
> and arm will do).

Also adding Suraj for a statement in this regard about his "[QEMU-PPC]
[PATCH V5 0/7] target/ppc: Rework spapr_caps" series which I think is
the PPC version of all of this right?
Not sure who to add for Arm :-/

@Cornelia - the consumers of these stable changes in particular IMHO
are Distributions for security updates.
Seeing at least one backport into 2.11.1 would be very helpful to
avoid issues that would not apply to a forward thinking 2.12 commit.
Such a (even short distance) backport being done by the Author would
have the lowest risk of such issues creeping in.
I'm not so sure on 2.(<11).x  - but one backport at least into the
latest release would be very nice to fulfill the [1] announcement
referenced above and provide a first release of these important
changes available earlier than full 2.12.


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