From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: kvm-devel <kvm-devel@lists.sourceforge.net>,
"J. Mayer" <l_indien@magic.fr>
Subject: Re: [kvm-devel] [Qemu-devel] expose host CPU features to guests: Take 3
Date: Tue, 25 Sep 2007 13:51:54 +0100 [thread overview]
Message-ID: <200709251351.55481.paul@codesourcery.com> (raw)
In-Reply-To: <46F8D577.3020306@qumranet.com>
On Tuesday 25 September 2007, Avi Kivity wrote:
> J. Mayer wrote:
> > On Tue, 2007-09-25 at 11:01 +0200, Avi Kivity wrote:
> >> Dan Kenigsberg wrote:
> >>> On Tue, Sep 25, 2007 at 03:28:24AM +0200, andrzej zaborowski wrote:
> >>>> Hi,
> >>>>
> >>>> On 24/09/2007, Dan Kenigsberg <danken@qumranet.com> wrote:
> >>>>> As with previous "Takes" of this patch, its purpose is to expose host
> >>>>> +{
> >>>>> + asm("cpuid"
> >>>>> + : "=a" (*ax),
> >>>>> + "=b" (*bx),
> >>>>> + "=c" (*cx),
> >>>>> + "=d" (*dx)
> >>>>> + : "a" (function));
> >>>>> +}
> >>>>
> Indeed for regular qemu this is useless. But it is useful for kqemu
> (for which there is support in mainline qemu), and for kvm (which we
> hope to merge one day).
And, as discussed before, it should be asking the hypervisor what features it
supports instead of trying to guess from the cpuid output.
Paul
next prev parent reply other threads:[~2007-09-25 12:52 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-05 17:45 [Qemu-devel] expose host CPU features to guests danken
2007-09-05 19:26 ` [Qemu-devel] Re: [kvm-devel] " Anthony Liguori
2007-09-05 19:34 ` Avi Kivity
2007-09-05 19:44 ` Daniel P. Berrange
2007-09-06 0:30 ` Paul Brook
2007-09-06 8:46 ` Avi Kivity
2007-09-07 10:47 ` Jamie Lokier
2007-09-09 7:51 ` [kvm-devel] [Qemu-devel] " Avi Kivity
2007-09-09 12:47 ` Jamie Lokier
2007-09-09 12:55 ` Avi Kivity
2007-09-09 13:07 ` Jamie Lokier
2007-09-09 13:14 ` Avi Kivity
2007-09-09 15:25 ` Paul Brook
2007-09-09 15:29 ` Avi Kivity
2007-09-09 15:47 ` Jamie Lokier
2007-09-09 16:12 ` Paul Brook
2007-09-09 16:38 ` Avi Kivity
2007-09-10 16:53 ` Jamie Lokier
2007-09-10 7:40 ` [Qemu-devel] expose host CPU features to guests: Take 2 Dan Kenigsberg
2007-09-10 11:47 ` Natalia Portillo
2007-09-10 12:01 ` Dan Kenigsberg
2007-09-07 16:18 ` Natalia Portillo
2007-09-11 19:48 ` Luke -Jr
2007-09-10 17:16 ` Jamie Lokier
2007-09-24 17:41 ` [Qemu-devel] expose host CPU features to guests: Take 3 Dan Kenigsberg
2007-09-25 1:28 ` andrzej zaborowski
2007-09-25 8:48 ` [kvm-devel] " Dan Kenigsberg
2007-09-25 9:01 ` Avi Kivity
2007-09-25 9:19 ` J. Mayer
2007-09-25 9:31 ` Avi Kivity
2007-09-25 10:40 ` Avi Kivity
2007-09-25 11:09 ` J. Mayer
2007-09-25 11:36 ` Avi Kivity
2007-09-25 12:05 ` Fabrice Bellard
2007-09-25 13:07 ` Jocelyn Mayer
2007-09-25 13:12 ` Avi Kivity
2007-09-25 13:27 ` Dan Kenigsberg
2007-09-25 15:54 ` Jamie Lokier
2007-09-25 16:15 ` Avi Kivity
2007-09-25 12:51 ` Paul Brook [this message]
2007-09-25 13:13 ` Avi Kivity
2007-09-25 9:29 ` Fabrice Bellard
2007-10-07 12:38 ` [Qemu-devel] x86 -cpu option: Take 4 Dan Kenigsberg
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