[pve-devel] [RFC qemu-server v2 32/32] command line: switch to blockdev starting with machine version 10.0

[Fiona Ebner]

Am 23.06.25 um 11:12 schrieb DERUMIER, Alexandre via pve-devel:
>>> +        my $blockdev =
>>> PVE::QemuServer::Blockdev::generate_drive_blockdev($storecfg,
>>> $device, {});
>>> +        mon_cmd($vmid, 'blockdev-add', %$blockdev, timeout => 60);
>>> +
>>> +        return 1;
> 
> should we handle error here ?  (I don't known if a blockdev-add can
> fail , and if it need 60s timeout like drive-add, as I think that the
> blockdev open is done in device-add)

Yes, we could remove the throttle group again if it fails.

qmp_blockdev_add() calls bds_tree_init() which calls bdrv_open(). So I
think using 60 seconds here like for "drive_add" is a sensible choice.

Note that "device_add" currently only uses the default timeout of 5
seconds. I'm not aware about reports about failure there directly. I had
sent a patch to increase that a while ago [0] because of a report with
"netdev_add". But probably would be good to take in too.

[0]:
https://lore.proxmox.com/pve-devel/20241212100247.20926-1-f.ebner@proxmox.com/