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Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM |
Date: |
Wed, 16 May 2012 11:13:42 +0300 |
On Wed, May 16, 2012 at 10:06:25AM +0200, Paolo Bonzini wrote:
> 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 <address@hidden>
> >
> > 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.
So driver tells firmware (meaning acpi? how?) that it's ok
to do surprize removal?
> Of course it has to do it early enough so that the guest
> doesn't crash.
>
> Paolo
What does early enough mean and how do we ensure that?
--
MST
- [Qemu-devel] [PATCH 1.1 0/4] Xen: Fix PV-on-HVM, Anthony PERARD, 2012/05/15
- [Qemu-devel] [PATCH 2/4] qdev: Introduce qdev_force_unplug., Anthony PERARD, 2012/05/15
- [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Anthony PERARD, 2012/05/15
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Michael S. Tsirkin, 2012/05/15
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Paolo Bonzini, 2012/05/16
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Paolo Bonzini, 2012/05/16
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Stefano Stabellini, 2012/05/16
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Michael S. Tsirkin, 2012/05/16
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Stefano Stabellini, 2012/05/16
- Re: [Qemu-devel] [PATCH 4/4] xen: Fix PV-on-HVM, Michael S. Tsirkin, 2012/05/16
[Qemu-devel] [PATCH 1/4] Introduce a new hotplug state: Force eject., Anthony PERARD, 2012/05/15