Hi, first a short summary of what the situation is: I'm running qemu 0.12.2, libvirt 0.7.6 on a E5520 based machine with kernel 2.6.33. I also tried 126.96.36.199 as I was using that before and still had the old kernel around, but kernel version doesn't matter AFAICT. The host is a gentoo AMD64 installation, the client is SuSE 11.0 (both 32 and 64 bit tested). This system is our machine to run automated PCIe device tests on, so the idea is to move PCIe devices from the host to different vms, run some testcases there and then move them away again. This has worked before (I'm not absolutely sure, but I would bet a bit of money that it was libvirt 0.7.5). So, what I'm going to do is simply virsh # attach-device suse11.0-AMD64 dev-pci-AD1-CL.xml Device attached successfully virsh # detach-device suse11.0-AMD64 dev-pci-AD1-CL.xml Device detached successfully This is just was I expect and what I now get with the two patches attached. The original situation was somewhat different (i.e. broken): -first I got complains in the log stating: tried to create id "(null)" twice for "device" Well, adding two devices with the same id is bad, and if that id is a NULL pointer anyway IMHO it's better to not pass the parameter at all. That's what the "null-pci-id" patch does. -next, detaching failed. I found out that the command sent to qemu was " pci_del pci_addr=fc67add0:7f41:fe38b65a" which is obviously bogus. After some hours of digging through the command stack up and down I found that it was the memcpy addressed in the "pci_memcpy" patch. When the device is attached qemu just replies with an empty string. Afterwards from the guestAddr the address of the PCI device in the client is copied back to the info structure. Too bad that this structure was never initialized to anything useful (at least not for me). When I kick out the memcpy() everything works fine. Configuration files of one device and one guest are attached, the others look similar. Note: when the client PCI id is passed to qemu anyway it would be cool if that could be specified in the device XML. For USB devices, too. Eike Please keep me CC'ed as I'm not on the list.
diff -Naurp libvirt-0.7.6-orig/src/qemu/qemu_conf.c libvirt-0.7.6/src/qemu/qemu_conf.c --- libvirt-0.7.6-orig/src/qemu/qemu_conf.c 2010-02-03 17:56:38.000000000 +0100 +++ libvirt-0.7.6/src/qemu/qemu_conf.c 2010-02-25 16:24:49.000000000 +0100 @@ -2690,7 +2690,8 @@ qemuBuildPCIHostdevDevStr(virDomainHostd dev->source.subsys.u.pci.bus, dev->source.subsys.u.pci.slot, dev->source.subsys.u.pci.function); - virBufferVSprintf(&buf, ",id=%s", dev->info.alias); + if (dev->info.alias != NULL) + virBufferVSprintf(&buf, ",id=%s", dev->info.alias); if (qemuBuildDeviceAddressStr(&buf, &dev->info) < 0) goto error;
diff -Naurp libvirt-0.7.6-orig/src/qemu/qemu_driver.c libvirt-0.7.6/src/qemu/qemu_driver.c --- libvirt-0.7.6-orig/src/qemu/qemu_driver.c 2010-02-03 16:56:00.000000000 +0100 +++ libvirt-0.7.6/src/qemu/qemu_driver.c 2010-02-26 15:11:09.000000000 +0100 @@ -5799,7 +5799,7 @@ static int qemudDomainAttachHostPciDevic if (ret < 0) goto error; hostdev->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI; - memcpy(&hostdev->info.addr.pci, &guestAddr, sizeof(guestAddr)); +// memcpy(&hostdev->info.addr.pci, &guestAddr, sizeof(guestAddr)); vm->def->hostdevs[vm->def->nhostdevs++] = hostdev;