|
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.
Good luck! :-)
Thanks,
-- Dexuan
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
| 
