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Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westm
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge |
Date: |
Tue, 16 Jan 2018 10:41:11 -0200 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Sat, Jan 13, 2018 at 08:22:31AM +0100, Vincent Bernat wrote:
> ❦ 12 janvier 2018 16:47 -0200, Eduardo Habkost <address@hidden> :
>
> > Adding Westmere-PCID would require adding a Westmere-PCID-IBRS
> > CPU model too, so this is starting to look a bit ridiculous.
> > Sane VM management systems would know how to use
> > "-cpu Westmere,+pcid" without requiring new CPU model entries in
> > QEMU. What's missing in existing management stacks to allow that
> > to happen?
>
> That's what I actually do. So, I am fine with the solution of doing
> nothing. However, it would be nice for unaware people to get the speedup
> of pcid without knowing about it. Maybe we can just forget about
> Westmere and still apply it to Sandy Bridge and Ivy Bridge.
If management stacks today don't let the user choose
"Westmere,+pcid", we probably have no other choice than adding a
Westmere-PCID CPU model. But our management stacks need to be
fixed so we won't need similar hacks in the future.
--
Eduardo
- [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Vincent Bernat, 2018/01/09
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Eduardo Habkost, 2018/01/12
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Vincent Bernat, 2018/01/13
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge,
Eduardo Habkost <=
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Vincent Bernat, 2018/01/16
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Kashyap Chamarthy, 2018/01/16
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Eduardo Habkost, 2018/01/16
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Daniel P. Berrange, 2018/01/16
- Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge, Kashyap Chamarthy, 2018/01/16