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Re: [Qemu-devel] [PATCH] usb-ohci: add vmstate descriptor

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH] usb-ohci: add vmstate descriptor
Date: Sat, 22 Mar 2014 22:04:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0

Am 22.03.2014 21:54, schrieb Peter Maydell:
> On 22 March 2014 20:18, Andreas Färber <address@hidden> wrote:
>> Because AFAIU
>> migration is possible without VMSD, just not with VMSD that sets
>> .unmigratable = 1.
> Well, the migration won't fail with an error, but on the destination
> end you'll end up with a device in its reset state but a guest which
> may think the device is in some other state. If the device was
> quiescent and doesn't need complex setup it might cope, but
> more likely is that that guest driver will fall over in a heap next
> time you try to use it...

Well, there is no OHCI state being added, only PCI state. So I'd be
curious to know what in there is the problem because a general review of
PCI devices might be due then - and ideally before we do the release.


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