Re: PCI and VGA Passthrough regressions on Xen 4.4.1 vs 4.3.2

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Nov 14, 2014 at 04:08:14PM -0500, Konrad Rzeszutek Wilk wrote:
> On Mon, Oct 06, 2014 at 03:55:36AM -0300, Zir Blazer wrote:
> > There is a regression in both PCI and VGA Passthrough in Xen 4.4.1 when compared to 4.3.2. Due to the added complexity of VGA Passthrough, I was suggested to focus instead in my PCI Passthrough issue, which involves the integrated Sound Card of my Motherboard. While it passes to the DomU and works, it produces robotic, distorted and lagged noise everytime it reproduces sound. The Video Card is an absolute no-go. On the previous Xen version, everything else being equal, both works properly.I have been trying to gather as much information as possible of my issue according to Xen Wiki articles http://wiki.xen.org/wiki/Debugging_Xen and http://wiki.xen.org/wiki/Reporting_Bugs_against_Xen so this E-Mail comes attached with tons of logs.
> > 
> > 
> > HARDWARE
> > Processor: Intel Xeon E3-1245V3 (Haswell) - http://ark.intel.com/products/75462/Intel-Xeon-Processor-E3-1245-v3-8M-Cache-3_40-GHz
> > Motherboard: Supermicro X10SAT (Chipset C226, BIOS R2.0) - http://www.supermicro.com/products/motherboard/Xeon/C220/X10SAT.cfm
> > Sound Card: Integrated Realtek ALC1150
> 
> So I tried this on my box which has similar specs:
> 
> Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
> 
> [    0.000000] DMI: Supermicro X10SAE/X10SAE, BIOS 2.00 04/21/2014
> 
> with todays' xen-unstable and with a simple guest config:
> 
> builder='hvm'
> memory = 2048
> name = "WinXP"
> vcpus=1
> vif = [ 'type=ioemu, mac=00:0F:4B:00:00:61,bridge=switch' ]
> disk=[ 'phy:/dev/G/WinXP,hda,w']
> vnc=1
> videoram=8
> vnclisten="0.0.0.0"
> vncpasswd=''
> stdvga=0
> usb=1
> usbdevice='tablet'
> qemu_model_version="traditional"
> device_model_version = 'qemu-xen-traditional'
> pci=["01:00.0","01:00.1","00:1b.0"]
> 
> # lspci -s 01:00.*
> 01:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4870]
> 01:00.1 Audio device: ATI Technologies Inc HD48x0 audio
> 
> # lspci -s 00:1b.0
> 00:1b.0 Audio device: Intel Corporation Device 8c20 (rev 04)
> 
> This is using Windows XP 32 (don't have 64bit laying around) and when
> using the Realtek HD Sound Effects and the '3D Audio Demo' it plays
> nicely on my speakers.

Aha! But if I use Xen 4.4 from Fedora 20 I get an horrible sound.

The plot thickens! The other interesting thing is that my unstable build
is with 'debug=y' while the Xen 4.4 from Fedora is not.

> 
> The VGA is a different story as it seems there are no Video drivers
> for XP for it available at all!
> 
> # 
> 
> 
> 
>