Re: Improve default machine type selection

On 3/15/23 08:40, Ján Tomko wrote: > On a Monday in 2023, Jim Fehlig wrote: >> If an explicit machine type is not specified in the VM config, the qemu >> driver will select the first machine type in the list of machine types for >> the specified accelerator. See virQEMUCapsGetPreferredMachine >> >> https://gitlab.com/libvirt/libvirt/-/blob/master/src/qemu/qemu_capabiliti... >> >> On my test machines, this works reasonably well for x86_64 where the first >> machine type is pc-i440fx-7.1. But for aarch64, the first machine is >> integratorcp, which is not very useful with maxCpus=1 and other limitations. > > Is it possible to run such machine with libvirt? I just did a quick check with libvirt 9.1.0 (qemu is a bit older, at 7.1.0): # cat test.xml <domain type='kvm'>   <name>test</name>   <memory unit='KiB'>2097152</memory>   <vcpu placement='static'>1</vcpu>   <os>     <type>hvm</type>     <loader readonly='yes' type='pflash'>/usr/share/qemu/aavmf-aarch64-code.bin</loader>     <nvram template='/usr/share/qemu/aavmf-aarch64-vars.bin'/>     <boot dev='hd'/>   </os>   <clock offset='utc'/>   <on_poweroff>destroy</on_poweroff>   <on_reboot>restart</on_reboot>   <on_crash>destroy</on_crash>   <devices>     <emulator>/usr/bin/qemu-system-aarch64</emulator>     <disk type='file' device='disk'>       <driver name='qemu' type='qcow2' discard='unmap'/>       <source file='/var/lib/libvirt/images/test.qcow2'/>       <target dev='vda' bus='virtio'/>     </disk>   </devices> </domain>

# virsh create test.xml error: Failed to create domain from test.xml error: internal error: Unexpected enum value 0 for virDomainDeviceAddressType