> Subject: RE: pci-stub error and MSI-X for KVM guest > > > Subject: Re: pci-stub error and MSI-X for KVM guest > > > > * Fischer, Anna (anna.fischer@xxxxxx) wrote: > > > > Subject: Re: pci-stub error and MSI-X for KVM guest > > > > > This works fine in principle and I can see the PCI device in the > > > > > guest under lspci. However, the 82576 VF driver requires the OS > > > > > to support MSI-X. My Fedora installation is configured with MSI- > X, > > > > > e.g. CONFIG_PCI_MSI is 'y'. When I load the driver it tells me > it > > > > cannot > > > > > initialize MSI-X for the device, and under /proc/interrupts I > can > > see > > > > > that MSI-X does not seem to work. Is this a KVM/QEMU limitation? > > It > > > > works > > > > > for me when running the VF driver under a non-virtualized Linux > > system. > > > > > > > > No, this should work fine. QEMU/KVM supports MSI-X to guest as > well > > as > > > > VFs. > > > > > > Actually, I just got this to work. However, it only works if I call > > > qemu-kvm from the command line, while it doesn't work when I start > > > the guest via the virt-manager. So this seems to be an issue with > > > Fedora's virt-manager rather than with KVM/QEMU. If I call qemu-kvm > > > from the command line then I get the pci-stub messages saying 'irq > xx > > > for MSI/MSI-x' when the guest boots up and the VF device works just > > fine > > > inside the guest. When I start the guest using virt-manager then I > > don't > > > see any of these irq allocation messages from pci-stub. Any idea > what > > > the problem could be here? > > > > No, sounds odd. Can you: > > > > # virsh dumpxml [domain] > > > > and show the output of the hostdev XML section? > > <hostdev mode='subsystem' type='pci' managed='yes'> > <source> > <address domain='0x0000' bus='0x03' slot='0x10' function='0x3'/> > </source> > </hostdev> > > The device to assign is at 0000:03:10.3, dmesg shows: > > pci-stub 0000:03:10.3: enabling device (0000 -> 0002) > assign device: host bdf = 3:10:3 I forgot, here is the process that the virt-manager GUI creates, e.g. this is the one that does not work. qemu 3072 1 4 11:26 ? 00:00:33 /usr/bin/qemu-kvm -S -M pc-0.11 -m 1024 -smp 1 -name FC10-2 -uuid b811b278-fae2-a3cc-d51d-8f5b078b2477 -monitor unix:/var/lib/libvirt/qemu/FC10-2.monitor,server,nowait -boot c -drive file=/var/lib/libvirt/images/FC10-2.img,if=virtio,index=0,boot=on -drive file=/home/af/Download/Fedora-12-x86_64-Live-KDE.iso,if=ide,media=cdrom,index=2 -net none -serial pty -parallel none -usb -vnc 127.0.0.1:0 -k en-gb -vga cirrus -soundhw es1370 -pcidevice host=03:10.3 Note that this one does work from the command line, but not via the GUI. For the debugging to work, I need the '-s' option to be added too... Cheers, Anna -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
