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

From: Thomas Huth
Subject: [Bug 670769] Re: CDROM size not updated when changing image files
Date: Thu, 12 Nov 2020 08:57:34 -0000

Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?

** Changed in: qemu
       Status: New => Incomplete

** Changed in: qemu
     Assignee: John Snow (jnsnow) => (unassigned)

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  CDROM size not updated when changing image files

Status in QEMU:

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
  as the host and I've tested, 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- -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'

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