Re: [Qemu-devel] [Bug 670769] Re: CDROM size not updated when changing image files

[Alex Davis]

I code, therefore I am


--- On Wed, 11/10/10, agraf <address@hidden> wrote:

> From: agraf <address@hidden>
> Subject: Re: [Qemu-devel] [Bug 670769] Re: CDROM size not updated when 
> changing image files
> To: address@hidden
> Date: Wednesday, November 10, 2010, 8:11 AM
> 
> On 10.11.2010, at 13:55, Alex Davis wrote:
> 
> > --- On Tue, 11/9/10, agraf <address@hidden>
> wrote:
> > 
> >> From: agraf <address@hidden>
> >> Subject: Re: [Qemu-devel] [Bug 670769] Re: CDROM
> size not updated when changing image files
> >> To: address@hidden
> >> Date: Tuesday, November 9, 2010, 10:47 PM
> >> 
> >> On 10.11.2010, at 04:17, Alex Davis wrote:
> >> 
> >>> Please note that until this bug is fixed, one
> cannot
> >> successfully
> >>> install a guest OS from a set of CD-ROMS where
> the
> >> first disk image is
> >>> smaller than subsequent ones.
> >>> 
> >>> -- 
> >>> CDROM size not updated when changing image
> files
> >>> https://bugs.launchpad.net/bugs/670769
> >>> You received this bug notification because you
> are a
> >> member of qemu-
> >>> devel-ml, which is subscribed to QEMU.
> >>> 
> >>> Status in QEMU: New
> >>> 
> >>> Bug description:
> >>> I'm using qemu 13.0 with a plain Linux kernel
> using
> >> the ata_piix driver as the guest, and an initrd
> that starts
> >> a shell. When changing the image in the monitor
> and reading
> >> from the CDROM in the guest, the size is not
> updated. I'm
> >> using LInux 2.6.32.24
> >>> as the host and I've tested 2.6.32.24, 2.6.35,
> and
> >> 2.6.36 as guests.  Both host and guest are
> 64-bit. Here
> >> is the command used to start the guest using the
> initrd:
> >>> 
> >>> ./x86_64-softmmu/qemu-system-x86_64 -cdrom
> >> /spare2/cd1.img -kernel
> >>
> /sources/linux-2.6.32.24-test/arch/x86/boot/bzImage -initrd
> >> /spare2/initrd.img -append 'root=/dev/ram0 rw'
> -cpu
> >> core2duo
> >>> 
> >>> Additional info on this bug can be found here:
> http://marc.info/?l=kvm&m=128746013906820&w=2. Note:
> >> this is how I discovered 
> >>> the bug, using 32-bit Slackware install CDs.
> >>> 
> >>> I'm attaching the initrd I used in my tests: I
> created
> >> two different-sized fake CDROM images by dd'ing
> from
> >> /dev/zero. In my tests,
> >>> cd1.img is smaller that cd2.img. In the
> monitor I
> >> executed 'change ide1-cd0 /spare2/cd2.img' to load
> the new
> >> image. I checked 
> >>> the size by cat'ing /sys/block/sr0/size in the
> guest
> >> after reading the CDROM. Reading the CDROM was
> done by
> >> typing
> >>> 'dd if=/dev/sr0 of=/dev/null bs=512 count=3'
> >> 
> >> Just to clarify, the contents of the image do
> change, but
> >> the reported
> >> size does not?
> > Correct?
> 
> Sounds like a missing change event to the guest to me.
> 
> Kevin, are you aware of this bug?
> 
I looks like change event is being sent, but it's being eaten by the
error recovery in the guest.

-- 
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https://bugs.launchpad.net/bugs/670769

Title:
  CDROM size not updated when changing image files

Status in QEMU:
  New

Bug description:
  I'm using qemu 13.0 with a plain Linux kernel using the ata_piix driver as 
the guest, and an initrd that starts a shell. When changing the image in the 
monitor and reading from the CDROM in the guest, the size is not updated. I'm 
using LInux 2.6.32.24
as the host and I've tested 2.6.32.24, 2.6.35, and 2.6.36 as guests.  Both host 
and guest are 64-bit. Here is the command used to start the guest using the 
initrd:

./x86_64-softmmu/qemu-system-x86_64 -cdrom /spare2/cd1.img -kernel 
/sources/linux-2.6.32.24-test/arch/x86/boot/bzImage -initrd /spare2/initrd.img 
-append 'root=/dev/ram0 rw' -cpu core2duo

Additional info on this bug can be found here: 
http://marc.info/?l=kvm&m=128746013906820&w=2. Note: this is how I discovered 
the bug, using 32-bit Slackware install CDs.

I'm attaching the initrd I used in my tests: I created two different-sized fake 
CDROM images by dd'ing from /dev/zero. In my tests,
cd1.img is smaller that cd2.img. In the monitor I executed 'change ide1-cd0 
/spare2/cd2.img' to load the new image. I checked 
the size by cat'ing /sys/block/sr0/size in the guest after reading the CDROM. 
Reading the CDROM was done by typing
'dd if=/dev/sr0 of=/dev/null bs=512 count=3'