From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Anthony PERARD <anthony.perard@citrix.com>,
Xen Devel <xen-devel@lists.xen.org>,
QEMU-devel <qemu-devel@nongnu.org>,
Anthony Liguori <anthony@codemonkey.ws>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM
Date: Wed, 16 May 2012 10:06:25 +0200 [thread overview]
Message-ID: <4FB36001.9030008@redhat.com> (raw)
In-Reply-To: <20120515210053.GB12039@redhat.com>
Il 15/05/2012 23:00, Michael S. Tsirkin ha scritto:
> On Tue, May 15, 2012 at 04:26:39PM +0100, Anthony PERARD wrote:
>> In the context of PV-on-HVM under Xen, the emulated nics are supposed to be
>> unplug before the guest drivers are initialized. This mean that there must be
>> unplug without the consent of the guest.
>>
>> Without this patch, the guest end up with two nics with the same MAC, the
>> emulated nic and the PV nic.
>>
>> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
>
> OK, so on Xen there are special devices that can be safely removed
> without telling the guest? Does there need to be regular hotplug for
> these devices too? Or can it be always surprise removal?
On Xen the PV drivers can ask the firmware to surprise-remove the
emulated NICs. Of course it has to do it early enough so that the guest
doesn't crash.
Paolo
next prev parent reply other threads:[~2012-05-16 8:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 15:26 [Qemu-devel] [PATCH 1.1 0/4] Xen: Fix PV-on-HVM Anthony PERARD
2012-05-15 15:26 ` [Qemu-devel] [PATCH 1/4] Introduce a new hotplug state: Force eject Anthony PERARD
2012-05-15 18:19 ` Stefano Stabellini
2012-05-15 18:25 ` Anthony PERARD
2012-05-15 20:52 ` Michael S. Tsirkin
2012-05-16 10:32 ` Stefano Stabellini
2012-05-16 11:15 ` Anthony PERARD
2012-05-16 11:23 ` Paolo Bonzini
2012-05-16 11:37 ` Anthony PERARD
2012-05-16 13:20 ` Michael S. Tsirkin
2012-05-16 15:52 ` Paolo Bonzini
2012-05-16 16:25 ` Michael S. Tsirkin
2012-05-16 16:02 ` Anthony Liguori
2012-05-16 16:24 ` Michael S. Tsirkin
2012-05-15 15:26 ` [Qemu-devel] [PATCH 2/4] qdev: Introduce qdev_force_unplug Anthony PERARD
2012-05-15 18:15 ` Stefano Stabellini
2012-05-15 18:22 ` Anthony PERARD
2012-05-15 15:26 ` [Qemu-devel] [PATCH 3/4] pci: Add force_unplug callback Anthony PERARD
2012-05-15 15:26 ` [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM Anthony PERARD
2012-05-15 21:00 ` Michael S. Tsirkin
2012-05-16 8:06 ` Paolo Bonzini [this message]
2012-05-16 8:13 ` Michael S. Tsirkin
2012-05-16 8:42 ` Paolo Bonzini
2012-05-16 10:19 ` Stefano Stabellini
2012-05-16 10:30 ` Michael S. Tsirkin
2012-05-16 10:37 ` Stefano Stabellini
2012-05-16 13:24 ` Michael S. Tsirkin
2012-05-15 16:26 ` [Qemu-devel] [PATCH 1.1 0/4] Xen: " Anthony Liguori
2012-05-15 16:42 ` Stefano Stabellini
2012-05-15 18:20 ` Stefano Stabellini
2012-05-15 21:06 ` Michael S. Tsirkin
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