From: "Michael S. Tsirkin" <mst@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: gleb@redhat.com, kvm@vger.kernel.org, qemu-devel@nongnu.org,
Blue Swirl <blauwirbel@gmail.com>, Jan Kiszka <jan.kiszka@web.de>,
avi@redhat.com, Anthony Liguori <anthony@codemonkey.ws>,
Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: [Qemu-devel] [PATCHv4 3/4] cpuid: disable pv eoi for 1.1 and older compat types
Date: Wed, 29 Aug 2012 13:31:13 +0300 [thread overview]
Message-ID: <20120829103113.GA5825@redhat.com> (raw)
In-Reply-To: <20120829102324.GC5225@redhat.com>
On Wed, Aug 29, 2012 at 01:23:24PM +0300, Michael S. Tsirkin wrote:
> > Michael, not migrating the PVEOI MSR actually crashes the guest?
>
>
> Not at all. migration currently simply disables PV EOI, so
> each EOI triggers exits after migration.
I would like to add: without this patch guest will crash.
But what will crash guest is *not* the fact
we do not migrate the PV EOI MSR.
It is the fact that PV EOI bit is set in CPUID.
If guest reads CPUID before migration and then
writes the MSR after migration, it will crash.
> --
> MST
next prev parent reply other threads:[~2012-08-29 10:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-28 17:43 [Qemu-devel] [PATCHv4 0/4] migrate PV EOI MSR Michael S. Tsirkin
2012-08-28 17:43 ` [Qemu-devel] [PATCHv4 1/4] linux-headers: update to 3.6-rc3 Michael S. Tsirkin
2012-08-28 17:43 ` [Qemu-devel] [PATCHv4 2/4] pc: refactor compat code Michael S. Tsirkin
2012-08-29 14:49 ` Anthony Liguori
2012-08-28 17:43 ` [Qemu-devel] [PATCHv4 3/4] cpuid: disable pv eoi for 1.1 and older compat types Michael S. Tsirkin
2012-08-28 19:13 ` Eduardo Habkost
2012-08-28 21:35 ` Michael S. Tsirkin
2012-08-28 22:02 ` Eduardo Habkost
2012-08-28 22:21 ` Michael S. Tsirkin
2012-08-28 22:25 ` Michael S. Tsirkin
2012-08-28 23:50 ` Eduardo Habkost
2012-08-29 10:06 ` Michael S. Tsirkin
2012-08-29 12:56 ` Eduardo Habkost
2012-08-29 13:18 ` Michael S. Tsirkin
2012-08-29 13:49 ` Eduardo Habkost
2012-08-29 14:11 ` Michael S. Tsirkin
2012-08-29 14:21 ` Eduardo Habkost
2012-08-29 9:59 ` Marcelo Tosatti
2012-08-29 10:03 ` Marcelo Tosatti
2012-08-29 10:32 ` Michael S. Tsirkin
2012-08-29 10:23 ` Michael S. Tsirkin
2012-08-29 10:31 ` Michael S. Tsirkin [this message]
2012-08-29 14:43 ` Juan Quintela
2012-08-29 13:36 ` Anthony Liguori
2012-08-29 13:40 ` Gleb Natapov
2012-08-29 14:09 ` Anthony Liguori
2012-08-29 14:29 ` Michael S. Tsirkin
2012-08-29 14:41 ` Eduardo Habkost
2012-08-29 15:04 ` [Qemu-devel] [QEMU 1.2 PATCH] i386: kvm: have a predefined set of default KVM feature bits Eduardo Habkost
2012-08-29 15:10 ` Michael S. Tsirkin
2012-08-29 15:46 ` Marcelo Tosatti
2012-08-29 14:03 ` [Qemu-devel] [PATCHv4 3/4] cpuid: disable pv eoi for 1.1 and older compat types Eduardo Habkost
2012-08-28 17:43 ` [Qemu-devel] [PATCHv4 4/4] kvm: get/set PV EOI MSR Michael S. Tsirkin
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