Re: [Xen-users] Xen 4.7.0 graphics pass through problems (Win10, AMD Radeon)

[Peter Milesson <miles@xxxxxxxx>]

Hi Daniel,

Well, strictly, I had to pass both the USB 1.1, and the corresponding 
USB 2.0 PCI device, otherwise USB didn't work. That's 2 PCI devices. If 
I would need to use USB 3.x also, yet another PCI device would need to 
be passed to the domU. In case of PCIe, it's not necessary. See the 
wiki: https://wiki.xenproject.org/wiki/Xen_PCI_Passthrough.
According to this discussion, it should not pose a problem even passing 
100 PCI devices.
http://www.gossamer-threads.com/lists/xen/api/260372

You should probably look if the PCI-device isn't in use, or if there are 
other problems.
Best regards,

Peter


On 2016-09-12 22:44, Daniel E. Shub wrote:
> I also have just upgraded to 4.7 from 4.5. In 4.5 I passed the the
> entire USB pci device allowing me to not have to specify the specific
> USB devices I have 4 USB PCI devices in total. In 4.7 I can only pass
> 2 of them. The other two give me errors. I also have done secondary
> vga pass through, but haven't check the graphics quality yet.
>
> On Mon, Sep 12, 2016 at 3:00 PM, Peter Milesson <miles@xxxxxxxx> wrote:
> > Hi folks,
> >
> > Final results of my tests.
> >
> > Passing USB devices individually worked, except for my USB sound device,
> > where the sound was chopped up, and very unpleasant. If I'm not completely
> > wrong, I read something that passing of USB devices is effectively USB 1.1.
> > Not very usable for things that need speed.
> >
> > I also tried usbctrl-attach, and usbdev-attach. It did not work at all.
> >
> > I got the idea to try to pass another physical USB controller on the
> > PCI-bus, than the original one. This time everything seems to work just
> > great. The USB function very good, and the graphics output almost completely
> > undisturbed. I just need to give the command xl pci-assignable-add in the
> > start script for my Windows 10 domU, and use the corresponding pci
> > parameters for the USB controller and the graphics card in the domU
> > configuration file.
> >
> > So far Xen 4.7.0 seems quite stable.
> >
> > Hope this helps somebody.
> >
> > Peter
> >
> >
> > On 2016-09-09 11:35, Peter Milesson wrote:
> > > Hi again,
> > >
> > > I've been playing around a bit more.
> > >
> > > It seems one of the problems is that I passed a couple of PCI-devices (USB
> > > controllers) to the VM, beside the graphics card.
> > >
> > > When I pass the USB-devices individually in the VM configuration file
> > > (usbdevice=['tablet','host:1.4','host:1:9','host:x.y']), the display
> > > problems seem to be more or less gone.
> > >
> > > IMHO, if you work in a VM with graphics, keyboard, mouse, etc., it's much
> > > simpler just pass the PCI-devices for a USB port, and you can connect
> > > whatever USB hubs and devices. With the method above, one has got to list
> > > the devices specifically. And I connect and disconnect a bunch of different
> > > USB-devices (barcode readers, docking stations, 1-wire devices, serial
> > > ports, etc.) frequently.
> > >
> > > I'm going to play around with this a little more, and publish my findings
> > > here. If somebody has got any idea how to allocate a whole USB-port, without
> > > passing a PCI-device, I would be happy to know.
> > >
> > > Best regards,
> > >
> > > Peter
> > >
> > > On 2016-09-09 09:51, Peter Milesson wrote:
> > > > Hi folks,
> > > >
> > > > I've been using Xen for 3 years, starting out with 4.2, and I've been
> > > > upgrading regularly, and installed 4.7.0 today.
> > > >
> > > > I'm using Windows 10, 64-bit with PCI pass through in a VM with
> > > > PV-drivers, using a AMD Radeon HD6450 card (AMD graphics cards don't seem to
> > > > need graphics pass through)
> > > >
> > > > Previously (up till Xen 4.6.3), the graphics output has displayed some
> > > > shorter lines, a bit like thin coarse snow, when watching videos. The
> > > > distortions stayed within the movie, and was tolerable.
> > > >
> > > > After upgrade to Xen 4.7.0, the video performance is seriously ugly. Just
> > > > for example, I open cnn.com and move the mouse pointer up and down over the
> > > > photos, which creates a bunch of flickering lines over the display. The same
> > > > with moving content in Youtube for example. Or opening a Cygwin terminal
> > > > window and scrolling through a file. Terrible.
> > > >
> > > > Nothing else has changed, only the Xen version.
> > > >
> > > > The current situation is far from acceptable, and my question is, if
> > > > somebody else has got the same experiences, and possibly if there's a
> > > > solution.
> > > >
> > > > If somebody has got a solution here, I'd be very grateful.
> > > >
> > > > Hardware and OS details below.
> > > >
> > > > Best regards,
> > > >
> > > > Peter
> > > >
> > > > *Hardware*
> > > > CPU: AMD FX-6100 (6-core)
> > > > Chipset: AMD 970A (has got a working IOMMU)
> > > > RAM: 16GB DDR3-1600MHz
> > > > Video: AMD Radeon HD6450
> > > >
> > > > *OS*
> > > > Linux Slackware 14.2 (latest)
> > > > Kernel: 4.4.19 long term stable
> > > >
> > > > *Xen*
> > > > Version: 4.7.0 (configure same as 4.6.3 and previous versions)
> > > >   ./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc
> > > > --libdir=/usr/lib64 --with-xenstored=oxenstored --disable-qemu-traditional
> > > > --disable-rombios --disable-stubdom
> > > > Xen dom0 boot entry (grub2):
> > > > menuentry "Xen 4.7.0 / Slackware 14.2 (kernel 4.4.19-dom0)" {
> > > >         set root=(hd0,1)
> > > >         multiboot /boot/xen-4.7.0.gz iommu=1 dom0_mem=2048M
> > > > dom0_max_vcpus=2 dom0_vcpus_pin console=vga cpufreq=xen:performance noreboot
> > > >         module /boot/vmlinuz-4.4.19-dom0 console=vga earlyprintk=xen
> > > > root=/dev/sda1 ro clocksource=xen xencons=off
> > > > }
> > > >
> > > > *Guest OS*
> > > > Windows 10 Pro 64-bit (2VCPUs)
> > > > Latest PV Drivers (8.2 series)
> > > > Graphics driver: Latest WHQL driver 15.201.1151.1008
> > > >
> > > >
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