Re: [Xen-devel] How vital is having "FLReset+" for VGA Passthru in DomU?

[Rolu <rolu@xxxxxxxx>]

On Fri, Jun 29, 2012 at 11:47 PM,  <cyberhawk001@xxxxxxxxx> wrote:
> On 6/29/2012 4:23 PM, Rolu wrote:
>>
>> On Fri, Jun 29, 2012 at 9:44 PM,  <cyberhawk001@xxxxxxxxx> wrote:
>>>
>>> I was reading the Wiki page here: http://wiki.xen.org/wiki/VTd_HowTo
>>> don't
>>> know how updated it is, BUT at the top it said:
>>> -------------------- -------------------- --------------------
>>> -------------------- -------------------- --------------------
>>>
>>> Xen 4.1 xl tools notes
>>>
>>> Only devices with FLR capabilities are supported.
>>> Passing through a PCI card without FLR capability will result an error.
>>>
>>> To check if your PCI devices have FLR function, check in this wiki, [How
>>> can
>>> I check if PCI device supports FLR (Function Level Reset) ?]
>>>
>>> If you see output with "FLReset-" then your PCI device don't support FLR
>>> function. If output have "FLReset+" then it does.
>>>
>>> As this time of writing, June 2012, there are very very few PCI devices
>>> support FLR function.
>>> -------------------- -------------------- --------------------
>>> -------------------- -------------------- --------------------
>>>
>>>
>>> THAN was reading here:
>>>
>>> http://wiki.xen.org/wiki/Xen_PCI_Passthrough#How_can_I_check_if_PCI_device_supports_FLR_.28Function_Level_Reset.29_.3F
>>> at the bottom of the page where it says:
>>>
>>> -------------------- -------------------- --------------------
>>> -------------------- -------------------- --------------------
>>>
>>> How can I check if PCI device supports FLR (Function Level Reset)?
>>>
>>> Run "lspci -vv" (in dom0) and check if the device has "FLReset+" in the
>>> DevCap field.
>>>
>>> If you are Ubuntu/Debian user don't forget to add sudo at front,
>>> otherwise,
>>> you won't get the result you should get.
>>>
>>> sudo lspci -vv | egrep -i --colour flreset
>>>
>>> The above line should get root access for lspci program and show colour
>>> with
>>> flreset it found from output
>>>
>>> -------------------- -------------------- --------------------
>>> -------------------- -------------------- --------------------
>>>
>>> I did that and ALL of my devices it listed showed "FLReset-", there were
>>> only 3x "Etron Technology, Inc. EJ168 USB3.0" controllers that showed
>>> "FLReset+"
>>>
>>> SO, I have been trying to get my ATI FirePro V7900 Video Card to passthru
>>> to
>>> a Windows 7 Ultimate DomU with no luck so far AND was wondering how
>>> critical
>>> was for that device to show as "FLReset+"?
>>>
>>> 1.) Since my VGA card and AUDIO component of it, shows up as "FLReset-",
>>> does that mean it is impossible to get it fully working in a Win7 DomU?
>>
>> I have a video card (Radeon HD 6670) with FLReset- passed through to a
>> linux domU as a secondary video card (i.e. it boots from the built in
>> emulated card, not the Radeon) and it works. The FLReset doesn't seem
>> mandatory.
>>
>> I am running the latest xen 4.2 unstable though.
>
>
>
> SO, what DomU are you using? That means you were able to install the Video
> drivers inside the DomU for your HD6670 card and you can reboot the DomU
> without issues and video still works?

Ubuntu 12.04, with ATI's drivers. Yes, it works.

>>> 2.) Does having the feature "FLReset+" depend on the motherboard BIOS,
>>> motherboard hardware or the BIOS onboard the Video Card that could be
>>> updated to get back the "FLReset+" so you can have the FLR reset
>>> functionality?
>>
>> I think it depends on the card's hardware. It has to implement this
>> functionality. A firmware update for the card could maybe add it, but
>> I haven't heard of any that do.
>
>
> Ya, so far i have not read or heard about this feature, BUT i know the FLR
> rest issues is quite the problem with Windows VMs, probably the same thing i
> am having issues with not working. Once i boot into Win7, install the ATI
> drivers, than reboot the DomU, and it just hangs at the "Starting Windows"
> black screen and never gets past it. I have read a bunch of things and will
> do more trial and error things, but for now just wondered about that
> "FLReset+" as stated on Wiki.
>

I don't have a windows 7 VM so I don't know if windows has a problem
with it. Are you using it as a primary or secondary video card?
Secondary seems easier to get to work.

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