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Re: [Xen-devel] PCI Device Subtree Change from Traditional to Upstream
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 8 Apr 2019 10:46:57 +0100
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- Cc: Kevin Stange <kevin@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 08 Apr 2019 09:47:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 1/26/18 10:38 AM, Paul Durrant wrote:
>> -----Original Message-----
>> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf
>> Of George Dunlap
>> Sent: 25 January 2018 18:15
>> To: Anthony Perard <anthony.perard@xxxxxxxxxx>
>> Cc: Kevin Stange <kevin@xxxxxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx;
>> George Dunlap <George.Dunlap@xxxxxxxxxx>
>> Subject: Re: [Xen-devel] PCI Device Subtree Change from Traditional to
>> Upstream
>>
>> On 01/25/2018 06:04 PM, Anthony PERARD wrote:
>>> On Thu, Jan 25, 2018 at 05:54:36PM +0000, George Dunlap wrote:
>>>> On 01/04/2018 12:52 PM, Anthony PERARD wrote:
>>>>> From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>>>>> Subject: [PATCH] libxl_dm: Explicitly put xen-platform device on PCI slot
>> 3
>>>>>
>>>>> In order to do that, we don't use xenfv machine anymore and explicity
>>>>> add the platform device on the command line.
>>>>>
>>>>> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>>>>
>>>> Anthony,
>>>>
>>>> It seems like we might want to add the ability to specify which slot we
>>>> want the xen-platform device to occupy. Is it worth thinking of the best
>>>> way to add a patch like this upstream?
>>>
>>> I think that would be nice for people who switch from qemu-trad to
>>> QEMU. The only question that remain is, how to name the xl config
>>> option? The rest is to simply take my libxl patch and make it use
>>> the new config option.
>>
>> Well the other half would be to make sure something like this doesn't
>> happen by accident in the future -- i.e., that no future changes in QEMU
>> will accidentally move it away from whatever the current slot is now.
>>
>
> IMO, it would be best if libxl specified the bus topology exactly (i.e.
> specified devfn for everything that appears on the bus). If we, as I hope,
> make a move to having Xen rather than QEMU own the topology then this should
> hopefully ensure at least some degree of forward compatibility.
Is this on anybody's radar? It seems like this wouldn't be a huge
amount of work, and it would prevent this sort of compatibility issue in
the future.
-George
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