[libvirt-users] [libvirt] Why virsh domxml-to-native qemu-argv changes PCI slot number
Andrea Bolognani
abologna at redhat.com
Thu Apr 18 14:23:05 UTC 2019
Moving to libvirt-users where it belongs.
On Thu, 2019-04-18 at 06:47 +0000, Tal Attaly wrote:
> Hi,
> I have bridge type interface defined with slot 3 -
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> but after running virsh domxml-to-native qemu-argv I get slot 2-
> -netdev tap,fd=21,id=hostnet0 -device e1000,netdev=hostnet0,id=net0,mac=f2:ff:ff:ff:ff:07,bus=pci.0,addr=0x2
> Any idea why it's happen and how to keep the slot number? Libvirt version is 4.5.0
I can reproduce this, and also confirm that it shouldn't happen :)
qemuDomainAssignAddresses() is supposed to make sure that any address
configured explicitly by the user (or previously by libvirt) is
preserved, and it's doing that correctly when it's called from inside
qemuDomainDefAssignAddresses(); however, for some reason, by the time
we call it again in qemuProcessPrepareDomain() the PCI address for
the network interface is no longer set, and so a fresh one gets
assigned instead.
I'll investigate further and get back to you.
> here is the full domain XML -
>
> <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
> <name>vm1</name>
> <uuid>dbad303e-fc1b-454e-8861-712bf1766a64</uuid>
> <memory unit='KiB'>4194304</memory>
> <currentMemory unit='KiB'>4194304</currentMemory>
> <vcpu placement='static'>1</vcpu>
> <os>
> <type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type>
> <boot dev='hd'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> </features>
> <cpu mode='custom' match='exact' check='partial'>
> <model fallback='allow'>SandyBridge-IBRS</model>
> </cpu>
> <clock offset='utc'>
> <timer name='rtc' tickpolicy='catchup'/>
> <timer name='pit' tickpolicy='delay'/>
> <timer name='hpet' present='no'/>
> </clock>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>destroy</on_crash>
> <pm>
> <suspend-to-mem enabled='no'/>
> <suspend-to-disk enabled='no'/>
> </pm>
> <devices>
> <emulator>/qemu/x86_64-softmmu/qemu-system-x86_64</emulator>
> <disk type='file' device='disk'>
> <driver name='qemu' type='qcow2'/>
> <source file='/var/lib/libvirt/images/vm.img'/>
> <target dev='hda' bus='ide'/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <controller type='usb' index='0' model='ich9-ehci1'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x1'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x2'/>
> </controller>
> <controller type='ide' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
> </controller>
> <controller type='pci' index='0' model='pci-root'/>
> <interface type='bridge'>
> <mac address='f2:ff:ff:ff:ff:07'/>
> <source bridge='br0:'/>
> <model type='e1000'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> </interface>
> <serial type='tcp'>
> <source mode='bind' host='10.210.27.119' service='9999'/>
> <protocol type='telnet'/>
> <target type='isa-serial' port='0'>
> <model name='isa-serial'/>
> </target>
> </serial>
> <console type='tcp'>
> <source mode='bind' host='10.210.27.119' service='9999'/>
> <protocol type='telnet'/>
> <target type='serial' port='0'/>
> </console>
> <input type='mouse' bus='ps2'/>
> <input type='keyboard' bus='ps2'/>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
> </memballoon>
> </devices>
> <qemu:commandline>
> <qemu:env name='CONFIG_FILE' value='/opt/cfg/qemu.cfg'/>
> </qemu:commandline>
> </domain>
--
Andrea Bolognani / Red Hat / Virtualization
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