Public bug reported:
The example starts with a basic call to run an image (it doesn't matter
which image)
$ sudo qemu-system-s390x -enable-kvm -cpu host -nographic -m 512 -hda
ubuntu-18.04-server-cloudimg-s390x.img
LOADPARM=[........]
Using virtio-blk.
Using SCSI scheme.
....
[ 0.451611] Linux version 4.15.0-42-generic (buildd@bos02-s390x-018) (gcc
version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #45-Ubuntu SMP Thu Nov 15 19:29:11 UTC
2018 (Ubuntu 4.15.0-42.45-generic 4.15.18)
[ 0.451617] setup.289988: Linux is running under KVM in 64-bit mode
Adding an empty virtio-scsi-ccw breaks it (different than x86)
$ sudo qemu-system-s390x -enable-kvm -cpu host -nographic -m 512 -hda
ubuntu-18.04-server-cloudimg-s390x.img -device
virtio-scsi-ccw,id=virtio-scsi-test
LOADPARM=[........]
Using virtio-scsi.
! Cannot locate virtio-scsi device !
It seems to be the bootloader code insisting on a device to scan, since
skipping bootloader makes it work
$ sudo qemu-system-s390x -enable-kvm -cpu host -nographic -m 512 -hda
ubuntu-18.04-server-cloudimg-s390x.img -device
virtio-scsi-ccw,id=virtio-scsi-test -kernel /boot/vmlinuz-4.15.0-42-generic
-initrd /boot/initrd.img-4.15.0-42-generic
[ 0.475643] Linux version 4.15.0-42-generic (buildd@bos02-s390x-018) (gcc
version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #45-Ubuntu SMP Thu Nov 15 19:29:11 UTC
2018 (Ubuntu 4.15.0-42.45-generic 4.15.18)
[ 0.475649] setup.289988: Linux is running under KVM in 64-bit mode
Those are just examples, but it seems you can add a disk-less virtio-scsi-ccw
to any to make it break.
We wondered about two things:
- the behavior is different than with virtio-scsi-pci
- one use case could want add a virtio-scsi-ccw with some explicit config to
later hot-add devices right?
All of this could as well be intentional, but I wanted to report it in
case it is a bug for you as well.
Thanks @Rharper for finding and mentioning it
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1806823
Title:
diskless virtio-scsi-ccw controller triggers an error
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