Date: Mon, 9 Mar 2009 19:02:49 +0100 (CET) From: Juergen Lock <nox@jelal.kn-bremen.de> To: gary.jennejohn@freenet.de Cc: freebsd-emulation@FreeBSD.org, Doug Barton <dougb@FreeBSD.org> Subject: Re: qemu 0.10.0 - cd/dvd drive access problems Message-ID: <200903091802.n29I2nYK004571@saturn.kn-bremen.de> In-Reply-To: <20090309103706.0a44fb26@ernst.jennejohn.org> References: <49B46A29.7020500@FreeBSD.org>
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In article <20090309103706.0a44fb26@ernst.jennejohn.org> you write:
>On Sun, 08 Mar 2009 18:00:25 -0700
>Doug Barton <dougb@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,
have you tried with the (now older, still at the 20080620 snapshot)
qemu-devel port thats in the tree? 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...) And finally you could try disabling aio (untested,
I hope the following still works:)
Index: Makefile
@@ -47,7 +47,7 @@
WITHOUT_CPU_CFLAGS=yes #to avoid problems with register allocation
CFLAGS:= ${CFLAGS:C/-fno-tree-vrp//}
-CONFIGURE_ARGS+= --prefix=${PREFIX} --cc=${CC}
+CONFIGURE_ARGS+= --prefix=${PREFIX} --cc=${CC} --disable-aio
.if defined(WITHOUT_SDL)
CONFIGURE_ARGS+= --disable-sdl --disable-gfx-check
>> 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.
>>
Try using the `change' monitor command (`change ide1-cd0 /dev/acd0'
in this case.) Also with Windows guests istr people having to click
`eject' in the guest too before it would recognize a new disc.
>> 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?
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.
> 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.
>
Hmm I haven't seen that here... Maybe -current locks the door when
the /dev/acd0 device node is open now too, instead of only when its
mounted like its here.
Good luck,
Juergen
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