[libvirt] [RFC] support vhost-user-scsi configuration

Hi Guys, Currently qemu and spdk already support vhost-user-scsi, but there is no vhost-user-scsi configuration in libvirt. We hope that libvirt supports the following configurations to facilitate docking with qemu. <controller type='scsi' index='0' model='vhost-user-scsi'> <driver queues='4'/> <source type='unix' path='/var/tmp/scsi'> <reconnect enabled='yes' timeout='3'/> </source> <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/> </controller> The usage in qemu like this: -chardev socket,id=chr-vu-virtio-disk10,path=/var/tmp/scsi,reconnect=3 -device vhost-user-blk-pci,num-queues=4,bus=pci.2,addr=0x0,chardev=chr-vu-virtio-disk10,id=scsi0 Could anyone give some suggestions?

On 4/15/23 15:48, wangjian (AN) wrote:
Hi Guys,
Currently qemu and spdk already support vhost-user-scsi, but there is no vhost-user-scsi configuration in libvirt.
We hope that libvirt supports the following configurations to facilitate docking with qemu.
<controller type='scsi' index='0' model='vhost-user-scsi'>
<driver queues='4'/>
<source type='unix' path='/var/tmp/scsi'>
<reconnect enabled='yes' timeout='3'/>
</source>
<address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</controller>
The usage in qemu like this:
-chardev socket,id=chr-vu-virtio-disk10,path=/var/tmp/scsi,reconnect=3
-device vhost-user-blk-pci,num-queues=4,bus=pci.2,addr=0x0,chardev=chr-vu-virtio-disk10,id=scsi0
Could anyone give some suggestions?
That's very likely because nobody wrote patches for it. I do not think there was a discussion where we decided to deliberately not support it. But I guess, what advantage there is in letting an external helper manage a <controller/> ? I though, vhost-user-* is ideal for individual devices rather than controllers. Meanwhile, for testing purposes (definitely NOT production), you can use qemu:command line passthrough: https://libvirt.org/kbase/qemu-passthrough-security.html Michal
participants (2)
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Michal Prívozník
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wangjian (AN)