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Hot-plugging a PCI serial device like this:
(qemu) device_add id=ff,driver=pci-serial
will print "Can't create serial device, empty char device" and exit. Not sure how easy to fix it is, though some of the infrastructure is there (realize methods can return an Error object, but PCI still uses the old init method).
Hi, Gerd
I tested this bug on old version qemu-kvm-rhev-2.1.2-23.el7_1.3.x86_64, got the following prompts:
(qemu) device_add id=ff,driver=pci-serial
Can't create serial device, empty char device
Device initialization failed.
Device 'pci-serial' could not be initialized
And also tested on latest qemu-kvm-rhev-2.3.0-4.el7:
(qemu) device_add id=ff,driver=pci-serial
Can't create serial device, empty char device
Device 'pci-serial' could not be initialized
Gerd, is this the expected behaviour after fix? The qemu does not exit any more. But seems I did not reproduce it on old qemu-2.1.
Yes, tested on the qemu-kvm-1.5.3-86.el7_1.1.x86_64, hot-plug a serial device with no chardev option, the qemu exits.
(qemu) device_add id=ff,driver=pci-serial
Can't create serial device, empty char device
/etc/qemu-ifdown: could not launch network script
[root@localhost home]#
So, according to comment 6 and comment 7, this bug is fixed in the latest qemu-kvm version.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2546.html