From: Vincent Bernat <vincent@bernat.im>
To: Eduardo Habkost <ehabkost@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <rth@twiddle.net>,
qemu-devel@nongnu.org, Jiri Denemark <jdenemar@redhat.com>,
Kashyap Chamarthy <kchamart@redhat.com>
Subject: Re: [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge
Date: Sat, 13 Jan 2018 08:22:31 +0100 [thread overview]
Message-ID: <87zi5ite88.fsf@luffy.cx> (raw)
In-Reply-To: <20180112184727.GJ6646@localhost.localdomain> (Eduardo Habkost's message of "Fri, 12 Jan 2018 16:47:27 -0200")
❦ 12 janvier 2018 16:47 -0200, Eduardo Habkost <ehabkost@redhat.com> :
> 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.
--
Avoid unnecessary branches.
- The Elements of Programming Style (Kernighan & Plauger)
next prev parent reply other threads:[~2018-01-13 7:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-09 7:01 [Qemu-devel] [PATCH x86-next v2] target-i386: add PCID flag to Westmere, Sandy Bridge and Ivy Bridge Vincent Bernat
2018-01-12 18:47 ` Eduardo Habkost
2018-01-13 7:22 ` Vincent Bernat [this message]
2018-01-16 12:41 ` Eduardo Habkost
2018-01-16 12:55 ` Vincent Bernat
2018-01-16 15:33 ` Kashyap Chamarthy
2018-01-16 17:08 ` Eduardo Habkost
2018-01-16 17:43 ` Daniel P. Berrange
2018-01-16 22:45 ` Kashyap Chamarthy
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