Re: [Xen-devel] PCI Device Subtree Change from Traditional to Upstream

[Kevin Stange <kevin@xxxxxxxxxxxxx>]

On 01/04/2018 07:26 AM, Paul Durrant wrote:
>> -----Original Message-----
>> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf
>> Of Anthony PERARD
>> Sent: 04 January 2018 12:52
>> To: Kevin Stange <kevin@xxxxxxxxxxxxx>
>> Cc: George Dunlap <George.Dunlap@xxxxxxxxxx>; xen-
>> devel@xxxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] PCI Device Subtree Change from Traditional to
>> Upstream
>>
>> On Wed, Jan 03, 2018 at 05:10:54PM -0600, Kevin Stange wrote:
>>> On 01/03/2018 11:57 AM, Anthony PERARD wrote:
>>>> On Wed, Dec 20, 2017 at 11:40:03AM -0600, Kevin Stange wrote:
>>>>> Hi,
>>>>>
>>>>> I've been working on transitioning a number of Windows guests under
>> HVM
>>>>> from using QEMU traditional to QEMU upstream as is recommended in
>> the
>>>>> documentation.  When I move these guests, the PCI subtree for Xen
>>>>> devices changes and Windows creates a totally new copy of each
>> device.
>>>>> Windows tracks down the storage without issue, but it treats the new
>>>>> instance of the NIC driver as a new device and clears the network
>>>>> configuration even though the MAC address is unchanged.  Manually
>>>>> booting the guest back on the traditional device model reactivates the
>>>>> original PCI subtree and the old network configuration with it.
>>>>>
>>>>> The only thing that I have been able to find that's substantially
>>>>> different comparing the device trees is that the device instance ID
>>>>> values differ on the parent Xen PCI device:
>>>>>
>>>>>
>> PCI\VEN_5853&DEV_0001&SUBSYS_00015853&REV_01\3&267A616A&3&18
>>>>>
>>>>>
>> PCI\VEN_5853&DEV_0001&SUBSYS_00015853&REV_01\3&267A616A&3&10
>>>>>
>>>>> Besides actually setting the guest to boot using QEMU traditional, is
>>>>> there a way to convince Windows to treat these devices as the same?  A
>>>>> patch-based solution would be acceptable to me if there is one, but I
>>>>> don't understand the code well enough to create my own solution.
> 
> Kevin,
> 
> I missed the original email as it went past...
> 
> Are Xen Project PV drivers installed in the guest? And are you talking about 
> a PV NIC device or an emulated device?

These guests use some of the older Xen PV drivers with a PV NIC, not an
emulated device.

-- 
Kevin Stange
Chief Technology Officer
Steadfast | Managed Infrastructure, Datacenter and Cloud Services
800 S Wells, Suite 190 | Chicago, IL 60607
312.602.2689 X203 | Fax: 312.602.2688
kevin@xxxxxxxxxxxxx | www.steadfast.net

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