[Xen-devel] RE: pciback+front needed for hvm ?

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

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

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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 !

 

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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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