From: Paolo Bonzini <pbonzini@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>,
Jidong Xiao <jidong.xiao@gmail.com>
Cc: qemu-devel@nongnu.org, KVM <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] [PATCH] Qemu: Fix eax for cpuid leaf 0x40000000
Date: Tue, 12 Aug 2014 21:12:00 +0200 [thread overview]
Message-ID: <53EA6700.2060603@redhat.com> (raw)
In-Reply-To: <20140812185552.GJ3011@thinpad.lan.raisama.net>
Il 12/08/2014 20:55, Eduardo Habkost ha scritto:
> This makes the CPUID data change under the guest's feet during
> live-migration.
>
> Adding compat code to ensure older machine-types keep the old behavior
> is necessary, but in this specific case it is mostly harmless because
> 0x0 is documented as being equivalent to 0x40000001.
>
> (But I don't know how guests are supposed to behave when they see
> CPUID[KVM_CPUID_SIGNATURE_NEXT].EAX==0.)
The only obvious thing to do would be to treat it as 0x40000101.
Paolo
next prev parent reply other threads:[~2014-08-12 19:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-04 1:10 [Qemu-devel] [PATCH] Qemu: Fix eax for cpuid leaf 0x40000000 Jidong Xiao
2014-06-04 7:09 ` Paolo Bonzini
2014-06-04 7:17 ` Jidong Xiao
2014-06-04 19:08 ` Bandan Das
2014-06-04 19:47 ` Jidong Xiao
2014-06-04 21:26 ` Bandan Das
2014-08-12 18:55 ` Eduardo Habkost
2014-08-12 19:12 ` Paolo Bonzini [this message]
2014-08-12 19:29 ` Eduardo Habkost
2014-08-13 12:18 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53EA6700.2060603@redhat.com \
--to=pbonzini@redhat.com \
--cc=ehabkost@redhat.com \
--cc=jidong.xiao@gmail.com \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).