Hi, i tried some pci devices in windows guest, but there are some problems. If i only use one pci card, i can install the driver in the guest and the device is working. If i want to use two or more pci devices in the guest, they are not usable, it means i can install the drivers, but the devices are not active in the device manager (yellow* exclamation mark)* If i install two ore more pci devices and pass through only one of them, its also not usable in the guest (yellow *exclamation mark)* Exists there some limitations in the usage of "PCI Passthrough"? (sorry for my bad english) Greetings Mirko
Hi Mirko,
On Sun, 2009-06-28 at 17:46 +0200, Mirko Raasch wrote:
Hi,
i want to use more then one pci card in my debian guest.
But when i start the guest, the log says:
libvirtd: 15:44:55.459: warning : pciTrySecondaryBusReset:483 : Other devices on bus with 0000:05:01.0, not doing bus reset
With "/usr/bin/qemu-system-x86_64 -m 512 -name test -hda /media/vm/test.img -boot c -vnc :2 -k de -pcidevice host=05:01.0 -pcidevice host=05:02.0 -pcidevice host=05:03.0" there seems to be no problems.
I'm afraid this is purely a limitation with the current code in qemu:
/* For now, we just refuse to do a secondary bus reset * if there are other devices/functions behind the bus. * In future, we could allow it so long as those devices * are not in use by the host or other guests. */ if (pciBusContainsOtherDevices(conn, dev)) { VIR_WARN("Other devices on bus with %s, not doing bus reset", dev->name); return -1; }
We also have a bug tracking this issue:
https://bugzilla.redhat.com/499678
Fixes welcome! :-)
Cheers, Mark.