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

["Daniel E. Shub" <daniel.e.shub@xxxxxxxxx>]

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
>>>
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@xxxxxxxxxxxxx
>>> https://lists.xen.org/xen-users
>>
>>
>>
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