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[Qemu-devel] [Bug 670769] Re: CDROM size not updated when changing image
From: |
Alex Davis |
Subject: |
[Qemu-devel] [Bug 670769] Re: CDROM size not updated when changing image files |
Date: |
Thu, 04 Nov 2010 05:08:32 -0000 |
** Attachment added: "initrd.img"
https://bugs.launchpad.net/bugs/670769/+attachment/1722521/+files/initrd.img
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CDROM size not updated when changing image files
https://bugs.launchpad.net/bugs/670769
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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'