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xen-devel
RE: [Xen-devel] Using VT-D to grant a Windows DomU access to a PCIExpres
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Once more,
graphics card is special, you
need to do some tricky things to make it work.
Randy (Weidong)
We are trying to pass a PCI-E graphics card to Vista(HVM)
using the Neo-1-to-1 approach, but encountered the same
problem with you.
2007/12/7, David Stone <unclestoner@xxxxxxxxx>:
I've
also been trying to get hardware-accelerate Direct3D to work in a
(Windows)
DomU via VT-D. I've got a PCI NIC passing through fine, but
not
a graphics carrd. The points below describe where I'm at and
what
is happening. I'd appreciate any help anyone could offer,
and also I
have these specific questions:
Is PCI Express supported
by VT-D and/or Xen's VT-D support? The
graphics card I'd like
to pass through is PCI Express.
If so, what PCI devices do I have to hide
from Dom0 and pass to my
Windows DomU? Do I need to do this for
the "PCI Express Root Port"
AND "PCI Express Port 1" PCI devices as well
has the graphics card
itself?
What device types have been tested
(informally) with Xen's VT-D
support? NICs I assume (plus NICs
work fine for me anyway), anything
else? Has all the testing
been with a Linux HVM DomU, or also other
OS DomU's
- I have a
machine with a VT-D IOMMU (Dell Optiplex 755).
- I'm using various Xen
builds from xen-unstable.
- I've verified that (for certain builds) Xen's
VT-D support is
working for me. I used a NIC PCI device (for a
couple of reasons) as
a test of VT-D/Xen, and it works...I can see the
actual NIC in Windows
2003 DomU's Device Manager (not an emulated NIC nor a
PV driver), and
it interacts with the network fine. Furthermore
I can RDP into the
Windows DomU
- The next step was to try passing the
PCI Express graphics card (an
ATI) through to the Windows DomU.
- In
order to save my graphics card for my Windows DomU, I tell
various components (grub, Xen kernel, Linux kernel) to use the
serial
port instead of the graphics card. I also pciback.hide
the PCI
Express graphics card from Dom0 (just as I hid the PCI
NIC). When
booting up Xen/Dom0 the all I see on the monitor is
the BIOS spash
screen, "Grub Loading Stage2...", and after that just a
black screen
with a blinking cursor in the upper-left
corner. Everything else
starting with the Grub selection screen
is through the serial port.
- I start up my Windows DomU. For
now the intent is to RDP into it
and see if Windows sees the graphics card
I passed through to it or
not. (As stated above, this works fine
if I don't try to pass through
the graphics card) But, after may
20 seconds (about the time it takes
the Windows DomU to fully boot up
normally), my physical machine
hangs. The last thing is just an
open-parenthesis on the serial
console (where I have Xen directing it's
output)...I presume it is the
beginning of a message from Xen that is
related to the hang, because I
don't see any such message
normally.
lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation
DRAM Controller
[8086:29b0] (rev 02)
00:01.0 PCI bridge [0604]: Intel
Corporation PCI Express Root Port
[8086:29b1] (rev 02)
00:03.0
Communication controller [0780]: Intel Corporation MEI
Controller
[8086:29b4] (rev 02)
00:03.2 IDE interface [0101]: Intel Corporation PT
IDER Controller
[8086:29b6] (rev 02)
00:03.3 Serial controller [0700]:
Intel Corporation Serial KT
Controller [8086:29b7] (rev 02)
00:1a.0 USB
Controller [0c03]: Intel Corporation USB UHCI Controller
#4 [8086:2937]
(rev 02)
00:1a.1 USB Controller [0c03]: Intel Corporation USB UHCI
Controller
#5 [8086:2938] (rev 02)
00:1a.7 USB Controller [0c03]: Intel
Corporation USB2 EHCI Controller
#2 [8086:293c] (rev 02)
00:1b.0 Audio
device [0403]: Intel Corporation HD Audio Controller
[8086:293e] (rev
02)
00:1c.0 PCI bridge [0604]: Intel Corporation PCI Express Port
1
[8086:2940] (rev 02)
00:1d.0 USB Controller [0c03]: Intel Corporation
USB UHCI Controller
#1 [8086:2934] (rev 02)
00: 1d.1 USB Controller
[0c03]: Intel Corporation USB UHCI Controller
#2 [8086:2935] (rev
02)
00:1d.2 USB Controller [0c03]: Intel Corporation USB UHCI
Controller
#3 [8086:2936] (rev 02)
00:1d.7 USB Controller [0c03]: Intel
Corporation USB2 EHCI Controller
#1 [8086:293a] (rev 02)
00:1e.0 PCI
bridge [0604]: Intel Corporation 82801 PCI Bridge
[8086:244e] (rev
92)
00:1f.0 ISA bridge [0601]: Intel Corporation LPC Interface
Controller
[8086:2914] (rev 02)
00:1f.2 SATA controller [0106]: Intel
Corporation 6 port SATA AHCI
Controller [8086:2922] (rev 02)
00:1f.3
SMBus [0c05]: Intel Corporation SMBus Controller [8086:2930] (rev
02)
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Unknown
device [1002:94c3]
03:00.0 Ethernet controller [0200]: Intel
Corporation 82557/8/9
[Ethernet Pro 100] [8086:1229] (rev
05)
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