Re: [Xen-devel] PCI and VGA Passthrough regressions on Xen 4.4.1 vs 4.3.2

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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!
> 
> # 
> 
> 
> 
> 

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