On Sun, Oct 18, 2020 at 14:34:16 +0200, daggs wrote:
Greetings All,
Sent: Thursday, October 15, 2020 at 6:25 PM From: "Peter Krempa" <pkrempa@redhat.com> To: libvir-list@redhat.com Cc: "daggs" <daggs@gmx.com> Subject: [PATCH 0/6] qemu: Fix cdrom as SCSI hostdev via -blockdev
-drive detects whether a device is a cdrom automatically but we need to use 'host_cdrom' when using blockdev explicitly. Fix the hostdev code which was recently converted to -blockdev.
Warning:
I _don't_ have a box with a CDROM handy so this code is not tested in action!
Peter Krempa (6): qemuProcessCreatePretendCmd: Split up preparation and command building qemu: hostdev: Prepare definition bits in qemuDomainPrepareHostdev qemu: Prepare hostdev data which depends on the host state separately qemuxml2argvmock: Remove mocking of 'virSCSIDeviceGetSgName' qemu: Detect whether a SCSI hostdev is a cdrom qemu: Add test cases for 'host_cdrom' blockdev backend via <disk>
I've tested the bellow on libvirt 6.8.0, I wasn't able to get it to work, with the same entry as the example, e.g.: <hostdev mode='subsystem' type='scsi' managed='yes'> <source> <adapter name='cdrom'/>
This is purely for tests, to force a cdrom since we can't probe the host. Using it for a VM will fail.
<address bus='0' target='0' unit='0'/> </source> <readonly/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </hostdev> I get this error: error: XML error: SCSI host device doesn't support managed mode.
if I mark the managed as no (like other pci pass-through devices I have in the vm), I get this error: error: internal error: Cannot parse adapter 'cdrom'
Yup, this is expected, you need to use a real 'adapterN' here.