This Problem occured on HPE DX380 Gen10, but I thin it will be on other vendors too.
After adding 2nd CPU, the CVM will not boot as PCI devices get newly enumerated:
[root@AHV1 ~]# virsh list --all
Id Name State
----------------------------------------
- NTNX-CVM shut off
[root@sAHV1 ~]# virsh start NTNX-CVM
error: Failed to start domain 'NTNX-CVM'
error: Hook script execution failed: internal error: Child process (LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin /etc/libvirt/hooks/qemu NTNX-CVM prepare begin -) unexpected exit status 1: [Errno 2] No such file or directory: '/sys/bus/pci/devices/0000:b1:00.0/driver_override'
To resolve this, look in a not yet expanded Node from the same cluster what "b1:00.0" is:
[root@sAHV2 ~]# lspci
...
b1:00.0 Serial Attached SCSI controller: Adaptec Smart Storage PQI 12G SAS/PCIe 3 (rev 01)
...
then look in your expanded node which address "Adaptec Smart Storage PQI..." has:
[root@sAHV1 ~]# lspci
....
5c:00.0 Serial Attached SCSI controller: Adaptec Smart Storage PQI 12G SAS/PCIe 3 (rev 01)
....
so you got 5c.00.0
then edit your CVM.xml on your expanded node:
[root@AHV1 ~]# virsh dumpxml NTNX-CVM
OLD:
.....
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0xb1' slot='0x00' function='0x0'/>
</source>
<rom bar='off'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</hostdev>
...
NEW:
....
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x5c' slot='0x00' function='0x0'/>
</source>
<rom bar='off'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</hostdev>
....
Then you can start your CVM with:
[root@sAHV1 ~]# virsh start NTNX-CVM
and it will start :-)
