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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Jun 29, 2012 at 06:26:06PM -0400, cyberhawk001@xxxxxxxxx wrote:
> >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.
> >
> SO i have heard, but I have been trying to get it to work using
> Secondary VGA Passthru. I tried Primary once and, for a lack of a
> better term, all hell broke loose during DomU boot as QEMU pretty
> much shut down....lol. Granted, i didn't try very hard and didn't
> apply any patched or anything, maybe some day if that feature is a
> bit more stable and there are actual guides on how to make it work,
> i will try again than.
> 
> It probably doesn't make any difference, BUT at the first set of
> trial and error, i had a GeForce 7600GS in PCIex16 Slot#1 so i have
> video in Dom0, than had my ATI FirePro V7900 in the PCIex16 Slot#2
> hidden to passthru. Now i am trying it with the ATI FirePro V7900 in
> the PCIex16 Slot#1 and an older PCI VGA card so i have video in
> Dom0.
> 
> I am using Xen 4.2 Rev25494, so almost the latest. For now i am only
> trying to get Win7 DomU to work, later on will move to Ubuntu. I do
> know that Windows has a lot of issues with FLR and not resetting the
> VGA card, just have to find the right steps to make it get over it.
> My USB3.0 works fine and no issues being passed thru, SO figured
> since that was the only PCI device that had "FLReset+", maybe that
> was making it work correctly as compared to VGA.
> 
> BUT, thanks for the reply and i will keep playing with it til i get
> something to work.
> 

Btw you probably want to try with xm/xend toolstack aswell.. 
just to verify if it's any different there.

-- Pasi


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel