qemu 0.10.0 - cd/dvd drive access problems
dougb at FreeBSD.org
Mon Mar 9 14:17:03 PDT 2009
On Mon, 9 Mar 2009, Juergen Lock wrote:
> In article <20090309103706.0a44fb26 at ernst.jennejohn.org> you write:
>> 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).
> Hmm. I wonder if this bug is related to the opensuse installer segfault,
Not sure I follow you there, sorry.
> have you tried with the (now older, still at the 20080620 snapshot)
> qemu-devel port thats in the tree?
That's actually what I started with (i.e., I compiled that port and used
it to install my windows guest) but I switched to the 0.10.0 before I
started goofing around with the CD/DVD stuff. I'll try going back to the
older version, but it's not likely I'll be able to get to it today.
> You could also try the new "werror"
> option for -drive (possible values are:
> report - report errors to a guest as IO errors
> ignore - continue as if nothing happened
> stop - stop VM on any error and retry last command on resume
> enospc - stop vm on ENOSPC error and retry last command on resume
> all other errors are reported to a guest.
> I think the default is "enospc" in 0.10.0 . Yeah -cdrom is readonly
> but who knows...)
Errrr, -cdrom being read-only is a problem, I need to be able to write CDs
and DVDs. Is there way to do that with the -drive option? I looked at the
man page but couldn't quite grasp it well enough to get a command line to
BTW, any hope that we'll have working USB in qemu on -current any time
soon? I can't help thinking that some of these issues might be avoided if
the windows guest could "see" my external drive directly. It would also
allow me to give syncing my iPhone a try, which is another big motivator
for me to be trying this at all.
> And finally you could try disabling aio (untested, I hope the following
> still works:)
If I don't have any luck with the other options I'll give this a try as
> Actually qemu 0.10.0 (and also the last few snapshots I posted updates
> for) now does its own aio emulation using threads, so the aio(4) kld or
> kernel option is no longer needed.
Ah, interesting. I wonder if it's possible that the kernel module is
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