Re: [libvirt] Why virsh domxml-to-native qemu-argv changes PCI slot number
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