Hi Dexuan,
I have tried both Jean Guyaders patches and
also I have tried the further XCI work that he has been developing based on
xen-unstable.
Unfortunately, Jean’s patches are
for Xen 3.3 and it seems in-compatible with my hardware as it bugs out very
early in the boot.
I assume most of these early patches are
now included in XCI along with a lot of the Neo code, therefore I have tried
XCI, compiled and booted successfully although the VGA passthrough still seems
very vendor specific as it does not work with any of my vga cards.
I am trying to find out further
information about the current state of XCI as I would like to help further the
development…
My setup is using two PCIe cards and not
needing to passthrough the primary, only load drivers against a secondary. I do
have x58 with VT-d2 all enabled and confirmed and is detected OK by Xen and XCI,
but none seem to work at this stage.
Thanks for your replies!
Tim
From:
Cui, Dexuan [mailto:dexuan.cui@xxxxxxxxx]
Sent: 14 April 2009 05:39
To: Tim
Moore; Kay, Allen M;
xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: pciback+front needed
for hvm ?
Passing-through a graphic card to HVM guest is much more
challenging than to PV guest.
The graphic card (especially an integrated graphic card)
may highly depend on the host plaform: e.g., system BIOS, ACPI, PCI
hierarchy... And, PCI config space of graphic card may have
virtualizion-unfriendly assumption(e.g., may require vBAR == pBAR).
There are lots of graphic cards, of which some may have all such special
requirements, and some may have not (so they might be easily passed through
to HVM guest correctly).
I didn't try the pass-through of graphics card at all. The
following is only my understanding to some discussions in the mail list.
IIRC, some people have successfully passed through *some*
kind of graphic card on *some* platform to HVM guest according to my
memory of the old emails in this mail list, but I'm not sure about the
details...
PS, in May 2008, Jean Guyader posted some patches about
"pass-through a graphic card". You might want to find the archive of
the mails and have a look.
From:
Tim Moore [mailto:timothy.moore@xxxxxxxxxxx]
Sent: Tuesday, April 14, 2009 7:55
AM
To: Cui, Dexuan; Kay, Allen M; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: pciback+front needed
for hvm ?
This works with non-HVM guest easy, I am
using it for an X server and the Nvidia drivers work great ..
All the I/O and Mem resources map through
correctly with HVM guest but driver fails to load (Code 12). Yes, I agree ioemu
is doing the work to present the PCI Bus to HVM so what is missing from ioemu
to allow this to work with HVM ?
Thanks,
Tim
From:
Cui, Dexuan [mailto:dexuan.cui@xxxxxxxxx]
Sent: 14 April 2009 00:47
To: Tim
Moore; Kay, Allen M;
xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: pciback+front needed
for hvm ?
For HVM PCI passthrough, ioemu (a
modified qemu as Device Model of HVM guest) emulates the PCI bus and does the proper operations. PCI passthrough for HVM guest by VT-d has
been supported for years. :-) Per my experience, almost
all the PCI/PCIe devices can work -- however, the passthrough of Graphics Card
could be complicated and the community is doing more work.
Thanks,
-- Dexuan
From:
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Tim Moore
Sent: Tuesday, April 14, 2009 7:29
AM
To: Kay,
Allen M; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] RE:
pciback+front needed for hvm ?
Please could you point me to the patch ?
Thanks !
From:
Kay, Allen M
[mailto:allen.m.kay@xxxxxxxxx]
Sent: 13 April 2009 22:00
To: Tim
Moore; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: pciback+front needed
for hvm ?
HVM guest uses PCI
bus provided by QEMU. The functionality in QEMU is complete for PCI
passthrough support most devices. Additional patch is needed for
graphics device passthrough.
From:
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Tim Moore
Sent: Monday, April 13, 2009 6:21
AM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] pciback+front
needed for hvm ?
Dom0 with pciback + DomU with pcifront. pcifront grabs
device during DomU boot and vendor driver then loads against passthrough device
and works great!
In the same scenario with HVM DomU, is pcifront needed or does
qemu provide the PCI Bus ?
Both Linux and Win32 hvm fail to load the vendor driver
against the PCI device. Is this a problem with qemu or is further support
needed in hvm domU for PCI passthrough?
Thanks,
Tim
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