Re: [Xen-devel] PCI passthrough will cause unknown device appearance in device manager of Windows OS via xenstore keys

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On April 13, 2017 4:41:03 AM EDT, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
>On Wed, Apr 12, 2017 at 04:21:42PM -0400, Konrad Rzeszutek Wilk wrote:
>> On Wed, Apr 12, 2017 at 04:46:33PM +0100, Wei Liu wrote:
>> > On Mon, Apr 10, 2017 at 09:43:13AM -0400, Konrad Rzeszutek Wilk
>wrote:
>> > [...]
>> > > 
>> > > .. Except that we need some way of doing FLR and Pciback
>> > > is the one doing it.
>> > > 
>> > > The right way would be to expand pciback to support the do_flr
>ioctl
>> > > and combine it with your patch.
>> > > 
>> > 
>> > OK. Does that mean the bug is in Linux and I should just take
>Ross's
>> 
>> Please don't.
>> 
>> Or if you would like I can do
>> 
>> Nacked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>> 
>
>Please correct me if I'm wrong: current libxl code is broken in one way
>and
>taking that patch means to break it in another way?
>
>What is the way forward? Do you want me to wait until those kernel
>patches are upstreamed?

Yes, as we cannot allow PCI pass through devices to not have an FLR or proper 
configuration register reset when a passing a device to a guest (or from one 
guest to another).

I can figure something up next week on how to restructure the pciback module.
>
>Wei.
>
>> 
>> > patch as-is for 4.9?
>> > 
>> > Wei.


Thanks!

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