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vhost-vdpa: allow passing opened vhostfd to vhost-vdpa

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Similar to other vhost backends, vhostfd can be passed to vhost-vdpa
backend as another parameter to instantiate vhost-vdpa net client.
This would benefit the use case where only open file descriptors, as
opposed to raw vhost-vdpa device paths, are accessible from the QEMU
process.

(qemu) netdev_add type=vhost-vdpa,vhostfd=61,id=vhost-vdpa1

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Si-Wei Liu 2022-10-08 00:58:58 -07:00 • committed by Jason Wang
parent 6ce262fbe7
commit 8801ccd050
3 changed files with 27 additions and 7 deletions
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6
qemu-options.hx
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@ -2790,8 +2790,10 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
" configure a vhost-user network, backed by a chardev 'dev'\n"
#endif
#ifdef __linux__
"-netdev vhost-vdpa,id=str,vhostdev=/path/to/dev\n"
"-netdev vhost-vdpa,id=str[,vhostdev=/path/to/dev][,vhostfd=h]\n"
" configure a vhost-vdpa network,Establish a vhost-vdpa netdev\n"
" use 'vhostdev=/path/to/dev' to open a vhost vdpa device\n"
" use 'vhostfd=h' to connect to an already opened vhost vdpa device\n"
#endif
#ifdef CONFIG_VMNET
"-netdev vmnet-host,id=str[,isolated=on|off][,net-uuid=uuid]\n"
@ -3296,7 +3298,7 @@ SRST
-netdev type=vhost-user,id=net0,chardev=chr0 \
-device virtio-net-pci,netdev=net0
``-netdev vhost-vdpa,vhostdev=/path/to/dev``
``-netdev vhost-vdpa[,vhostdev=/path/to/dev][,vhostfd=h]``
Establish a vhost-vdpa netdev.
vDPA device is a device that uses a datapath which complies with