On Tue, Apr 5, 2011 at 6:42 AM, David Ahern <dsahern@xxxxxxxxx> wrote: > On 04/04/11 23:33, Stefan Hajnoczi wrote: >> On Mon, Apr 4, 2011 at 6:54 PM, David Ahern <dsahern@xxxxxxxxx> wrote: >>> On 04/04/11 07:38, Anthony Liguori wrote: >>>> On 04/04/2011 08:22 AM, Avi Kivity wrote: >>>>> On 04/03/2011 02:57 PM, Stefan Hajnoczi wrote: >>>>>> In order for media change to work with Linux host CD-ROM it is >>>>>> necessary to reopen the file (otherwise the inode size will not >>>>>> refresh, this is an issue with existing kernels). >>>>>> >>>>> >>>>> Maybe we should fix the bug in Linux (and backport as necessary)? >>>>> >>>>> I think cd-rom assignment is sufficiently obscure that we can require >>>>> a fixed kernel instead of providing a workaround. >>>> >>>> Do reads fail after CD change? Or do they succeed and the size is just >>>> reported incorrectly? >>>> >>>> If it's the later, I'd agree that it needs fixing in the kernel. If >>>> it's the former, I'd say it's clearly a feature. >>> >>> In January 2010 I was seeing old data -- data from the prior CD -- in >>> the guest after the media change. >> >> Yikes. Is there a bug report for this? What are the steps to reproduce it? > > Not that I know of. It is reported by someone else last year as well: > http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg32999.html Thanks for the link. That looks like typical symptoms of missing media change (which can also legitimately happen if the guest does not poll). This should be fixed once the CD-ROM fixes are merged into QEMU and Linux. Stefan -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list