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

From: Alexey Kardashevskiy
Subject: Re: [Qemu-devel] [PATCH] usb-ohci: add vmstate descriptor
Date: Sun, 23 Mar 2014 08:50:16 +1100
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 03/23/2014 08:04 AM, Andreas Färber wrote:
> 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.

Without the patch, if to migrate a machine while it is in SLOF between
BARs assigned and USB driver started working, the BAR memory regions were
not enabled and BAR accesses were ending up in unassigned_mem_ops.


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