qemu 0.10.0 - cd/dvd drive access problems

[Gary Jennejohn]

On Sun, 08 Mar 2009 18:00:25 -0700
Doug Barton <dougb at FreeBSD.org> wrote:

> One of my main reasons for wanting to install qemu was to be able to
> use Windows tools for things like archiving DVDs. Now that I have qemu
> working pretty well for most things, I tried to start using it for
> DVD/CD access and it's not working well at all. I installed XP via a
> typical installation CD, so I thought I had it made in this area. :(
> 
> I'm using '-cdrom /dev/acd0' the same way I did for the install. If
> there is a disc in the drive when I start qemu I can "see" the disc,
> and copy some small files from it. However trying to copy/read large
> files (say, 1G) doesn't work at all. I get an error saying that sector
> of the disc cannot be read (this is with known-good discs). I tried
> with and without the cd-rom DMA compile-time OPTION, no luck. If I
> remove the disc from the drive, or if there is no disc in the drive
> when I start qemu, inserting one after it starts produces no results.
> Every time I try to access the drive I get the "Please insert a disc
> into drive D:" error message.
> 
> I'm using a fairly up to date 8-current as the host, btw.
> 
> 
> Any suggestions?
> 

Do you have vfs_aio in your kernel or as a module?  I've run openSUSE
in qemu and used the DVD drive with no problems at all; I have vfs_aio
in my kernel.  However, I don't know how much data were transfered by
openSUSE.  Since I was merely loading packages from the DVD it may have
been only a few MB.

One thing I've noticed is that the DVD drive is locked and I can't open
the drawer once qemu starts, even if there is no disc in the drive.
Apparently openSUSE acceses the drive (i.e. locks it) even when it's
empty.

---
Gary Jennejohn