Public bug reported: Hi,
yesterday unfortunately a customer reported a failed snapshot of his VM. Going through the logfile I discovered: "Device 'ide1-cd0' is writable but does not support snapshots" this is with qemu-1.2.0 and 1.0.1 at least... Why writeable? Even if I specify "-drive ...,readonly=on,snapshot=off" to qemu the monitor-command sees the CD-ROM-device as being writeable?! Somewhere I saw a "hint" for blockdev.c: === snip === --- /tmp/blockdev.c 2012-10-24 11:37:10.000000000 +0200 +++ blockdev.c 2012-10-24 11:37:17.000000000 +0200 @@ -551,6 +551,7 @@ case IF_XEN: case IF_NONE: dinfo->media_cd = media == MEDIA_CDROM; + dinfo->bdrv->read_only = 1; break; case IF_SD: case IF_FLOPPY: === snap === after installing with this small patch applied it works, so insert CD, savevm <somename> succeeds. This should be fixed at all correct places, and the tags "readonly=on,snapshot=off" should do it, too. Or even just work after specifying a drive being a CD-rom should do the trick ;-) Another "bad habit" is, that the ISO/DVD-file has to be writeable to be changed? Thnx for attention and regards, Oliver. ** Affects: qemu Importance: Undecided Status: New -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1070762 Title: savevm fails with inserted CD, "Device '%s' is writable but does not support snapshots." Status in QEMU: New Bug description: Hi, yesterday unfortunately a customer reported a failed snapshot of his VM. Going through the logfile I discovered: "Device 'ide1-cd0' is writable but does not support snapshots" this is with qemu-1.2.0 and 1.0.1 at least... Why writeable? Even if I specify "-drive ...,readonly=on,snapshot=off" to qemu the monitor-command sees the CD-ROM-device as being writeable?! Somewhere I saw a "hint" for blockdev.c: === snip === --- /tmp/blockdev.c 2012-10-24 11:37:10.000000000 +0200 +++ blockdev.c 2012-10-24 11:37:17.000000000 +0200 @@ -551,6 +551,7 @@ case IF_XEN: case IF_NONE: dinfo->media_cd = media == MEDIA_CDROM; + dinfo->bdrv->read_only = 1; break; case IF_SD: case IF_FLOPPY: === snap === after installing with this small patch applied it works, so insert CD, savevm <somename> succeeds. This should be fixed at all correct places, and the tags "readonly=on,snapshot=off" should do it, too. Or even just work after specifying a drive being a CD-rom should do the trick ;-) Another "bad habit" is, that the ISO/DVD-file has to be writeable to be changed? Thnx for attention and regards, Oliver. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1070762/+subscriptions