On Mon, Oct 31, 2011 at 10:51:34PM +0200, Pasi Kärkkäinen wrote: > On Mon, Oct 31, 2011 at 10:13:36PM +0200, Pasi Kärkkäinen wrote: > > Hello, > > > > While testing Fedora 16 Xen PVHVM guests I noticed the following problem: > > > > When starting F16 PVHVM guest I can see the vifX.0 and tapX.0 interfaces appear on dom0, > > but after the guest kernel (Linux 3.1.0) starts and loads PVHVM drivers the > > vif/tap interfaces disappear from dom0.. > > so the bridge in dom0 doesn't have any vifs/taps connected to it anymore. > > > > Has anyone seen that behaviour? > > > > I bet that's also the reason why eth0 inside the PVHVM guest > > has a MAC address with only zeroes in it: 00:00:00:00:00:00. > > > > If I disable PVHVM with "xen_platform_pci=0" in the domain cfgfile > > then network for the guest works OK using the qemu-dm emulated nic. > > > > PVHVM guest cfgfile: > > > > <snip> > > > > > Some output from inside the PVHVM guest: > > > > # ifconfig eth0 > > eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 > > BROADCAST MULTICAST MTU:1500 Metric:1 > > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:1000 > > RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) > > > > <snip> > > > > > Full PVHVM guest kernel (Linux 3.1.0) dmesg attached to this email. > > Some parts of the guest dmesg here: > > > > $ egrep -i 'xen|vif' xen-4.1.2-f16pvhvm-linux-3.1.0-dmesg.txt > > > > <snip> > > > > > dom0 kernel (Linux 3.1.0 aswell) messages: > > > > <snip> > > > > > > > "xm log" doesn't have any errors. > > Any ideas how to fix this? Why do the vif/tap devices disappear from dom0? > > > > Well.. it was actually as simple as removing "type=ioemu" from the vif line. > Working vif-example for Xen PVHVM Linux guest VM: > > vif = [ 'mac=00:16:5f:03:01:15, bridge=virbr0, model=e1000' ] > > So uhm.. when enabling PVHVM there's no need to modify the disk line, > but you need to modify the vif-line.. is that like it should be ? > It seems "type=ioemu" is not required for anything.. not even for normal HVM emulated nics. So this works for both normal HVM and PVHVM: vif = [ 'mac=00:16:5f:03:01:15, bridge=virbr0, model=e1000' ] And control the HVM/PVHVM mode with: xen_platform_pci=1 or xen_platform_pci=0 -- Pasi -- xen mailing list xen@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/xen
