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:
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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.
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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:

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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

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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?
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 just spent a lot of time and money building this computer for the purpose of getting Xen to work (So far still working on that), i would just hate to see all of that go to waste, SO hoping someone could answer the above concerns... :)

Thank you as always