Bug 692056

Summary:	sys-apps/systemd-242-r6 udev doesn't create /dev/disk/by-id symlinks for virtio devices
Product:	Gentoo Linux	Reporter:	Anton Gubarkov <anton.gubarkov>
Component:	Current packages	Assignee:	Gentoo systemd Team <systemd>
Status:	RESOLVED UPSTREAM
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Anton Gubarkov 2019-08-13 09:00:52 UTC

I've got a QEMU/KVM VM with gentoo linux as the host and gentoo linux as the guest.

The guest has 3 virtio disks attached and 1 sata dvdrom. 

in the guest:
localhost ~ # ls -l /dev/vd?
brw-rw---- 1 root disk 254,  0 Aug 13 10:24 /dev/vda
brw-rw---- 1 root disk 254, 16 Aug 13 10:24 /dev/vdb
brw-rw---- 1 root disk 254, 32 Aug 13 11:47 /dev/vdc

localhost ~ # ls -l /dev/disk/by-id/
total 0
lrwxrwxrwx 1 root root 9 Aug 13 10:24 ata-QEMU_DVD-ROM_QM00001 -> ../../sr0

Comment 1 Mike Gilbert gentoo-dev

2019-08-14 08:30:06 UTC

I don't think virtio disks have any hardware IDs that could be used for this.

Regardless, this is probably not a Gentoo-specific behavior. If you want something changed, create an issue upstream.