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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Xen-users] VGA passthough still not working
Hi,
yes, my Motherboard (DX58SO) announces "FLR Capability" - at least it's active
in BIOS:
BIOS:
XD Technology <Enable>
Intel VT <Enable>
Intel VT for Direct I/O (VT-d) <Enable>
Interrupt Remapping <Enable>
FLR Capability <Enable>
But lspci -vv shows for the ATI Card:
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
OTOH your lspci also shows "FLReset-" - but DomU Reboots work for you, so this
might not be the cause of my problem....
Until now (as you said its working in your setup) i thought it has something
to do with the " FLR complication" , mainly "â Need to save/restore certain
MMIO registers across FLRâs" - Allen M. Kay mentions on Page 11 of this Slide
here:
http://www.linux-kvm.org/wiki/images/b/be/2011-forum-%24graphics-direct-
assignment.pdf
But thats just a wild guess by me ...
Any other hints/thoughts on this?
Greetings!
Tobias
Am Mittwoch, 25. Januar 2012, 18:23:07 schrieb Doug Magee:
> On Wed, 2012-01-25 at 04:39 -0500, Tobias Geiger wrote:
> > Hello Doug!
> >
> > see below ....
> >
> > Am Dienstag, 24. Januar 2012, 19:31:45 schrieb Doug Magee:
> > > On Tue, 2012-01-24 at 09:37 -0500, Tobias Geiger wrote:
> > > > > > > Both setup have the "flaw" that they only work once -
> >
> > meaning
> >
> > > > you
> > > >
> > > > > > can't reboot
> > > > > >
> > > > > > > your DomU , cause after the reboot the passed-through Card
> > > >
> > > > doesnt
> > > >
> > > > > > have correct
> > > > > >
> > > > > > > 3D-Accelleration any more (was/is the case with NVIDIA and
> >
> > ATI,
> >
> > > > > > Windows XP and
> > > > > >
> > > > > > > Windows7 )
> > > > > >
> > > > > > For me it was with ATI with Windows7. Hadn't tried other OSes.
> > > > > >
> > > > > > Anybody had luck with passing the card more than once to a
> >
> > guest?
> >
> > > > With
> > > >
> > > > > > any random set of patches?
> > > >
> > > > I was a bit un-percice regarding the "reboot" issue:
> > > >
> > > > The passing-through itself works even after a reboot of DomU - the
> > > > rebooted
> > > > System spits out its Graphics normaly through the passed-through
> >
> > Card
> >
> > > > (NVIDA
> > > > or ATI doesnt matter here) ; BUT:
> > > > After a reboot it doesn't work properly. Meaning: Slow 3d
> >
> > Performance,
> >
> > > > i.e.
> > > > unsable for real 3d apps, even a 3d Desktop;
> > > > For example, when the Card gives you 70fps in a Benchmark after a
> > > > fresh Cold
> > > > Boot, it only gives you 5-10fps after a reboot, this will be that
> >
> > low
> >
> > > > until
> > > > you reboot Dom0 also, not only DomU;
> > > >
> > > > hopefully i described the scenario better now...
> > >
> > > Ah, got it. I hadn't been doing anything 3D intensive, only running
> >
> > the
> >
> > > Aero desktop. I installed 3DMark Vantage and ran a couple of tests.
> >
> > I
> >
> > > get the same results (within a fraction of a %) after a cold boot as
> >
> > i
> >
> > > do after rebooting multiple times, and always very close to native.
> >
> > It
> >
> > > seems i don't have the problem you're having.
> > >
> > > Do you get any different log messages after a reboot (xl dmesg, dom0
> > > dmesg, qemu log)? Have you tried with iommu=verbose to see if
> >
> > there's
> >
> > > any more useful information there?
> >
> > Cool. Finally someone NOT suffering the
> > reboot-performance-regression-Problem
> >
> > :)
> >
> > I searched back and forth, rebooted DomU like crazy, diff'ed the
> > dmesg/xldmesg/qemu-dm - but no difference :(
> >
> > What kind of ATI Card are you passing through?
>
> It's an HIS incarnation of the Radeon 4770. lspci -vvv output at the
> bottom of the message.
>
> > Would be nice to find out whats causing this...
>
> Does your device/bus support FLR? Do you get any messages like the
> following when you use xl create/xl pci-attach?
>
> libxl: error: libxl_pci.c:... The kernel doesn't support reset from
> sysfs for PCI device ...
>
> > Greetings!
> > Tobias
>
> 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 4770
> [RV740] (prog-if 00 [VGA controller])
> Subsystem: ATI Technologies Inc Device 0d00
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B- DisINTx-
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
> <MAbort- >SERR- <PERR- INTx-
> Latency: 0, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 16
> Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
> Region 2: Memory at fbb20000 (64-bit, non-prefetchable) [size=64K]
> Region 4: I/O ports at e000 [size=256]
> Expansion ROM at fbb00000 [disabled] [size=128K]
> Capabilities: [50] Power Management version 3
> Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
> DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1
> unlimited
> ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
> RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
> MaxPayload 128 bytes, MaxReadReq 128 bytes
> DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
> LnkCap: Port #0, Speed 5GT/s, Width x16, ASPM L0s L1, Latency L0
> <64ns, L1 <1us
> ClockPM- Surprise- LLActRep- BwNot-
> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive-
> BWMgmt- ABWMgmt-
> DevCap2: Completion Timeout: Not Supported, TimeoutDis-
> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
> LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-,
> Selectable De-emphasis: -6dB
> Transmit Margin: Normal Operating Range,
EnterModifiedCompliance-
> ComplianceSOS-
> Compliance De-emphasis: -6dB
> LnkSta2: Current De-emphasis Level: -6dB
> Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
> Address: 00000000fee00438 Data: 0000
> Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1
> Len=010 <?>
> Kernel driver in use: pciback
> Kernel modules: radeon
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