CD-ROM size not updated when switching CD-ROM images.

[Alex Davis <alex14641@yahoo.com>]

Steps to reproduce:
) Download the first two Slackware-13.1 32-bit CD-ROM ISO images.
) Start KVM with the following command
   qemu-system-x86_64 -m 1024M \
     -cdrom < full path of 1st install disk > \
     -boot d
) Hit return when prompted for extra boot parameters.
) Hit return when asked to select a keyboard map.
) Hit return at the login prompt.
) cat /sys/block/sr0/size: this should return 1209360.
) Press Alt-Ctrl-2 to access the monitor
) eject ide1-cd0
) change ide1-cd0 < full path name of 2nd install disk >
) Press Alt-Ctrl-1 to return to the guest.
) dd if=/dev/sr0 of=/dev/null bs=512 skip=1209360 count=3
  this should return 
   3+0 records in
   3+0 records out.
  instead it returns 0+0....
) cat /sys/block/sr0/size: this still returns 1209360; it should return 1376736.

Oddly, when "mount /dev/sr0 ...." is  executed in the guest, ls of the mounted directory shows the correct contents for the 2nd CD.


KVM version is kvm-qemu-0.13.0

Host CPU model name      : Intel(R) Core(TM)2 Duo CPU     E8600  @ 3.33GHz
Host kernel is 2.6.32.12
Host arch is x86_64

Guest is Slackware 13.1 32-bit 
Guest kernel version is 2.6.33.4

Start command:
qemu-system-x86_64 -m 1024M \
-cdrom /spare2/slackware-13.1-install-d1.iso \
-boot d 

Not affected by -no-kvm-irqchip
Not affected by -no-kvm-pit
Not affected by -no-kvm


I can test patches.


Built with:
bash-3.2$ ./configure --prefix=/usr/kvm-qemu-0.13.0 --extra-ldflags="-L/usr/X11R7.4/lib"
Install prefix    /usr/kvm-qemu-0.13.0
BIOS directory    /usr/kvm-qemu-0.13.0/share/qemu
binary directory  /usr/kvm-qemu-0.13.0/bin
config directory  /usr/kvm-qemu-0.13.0/etc
Manual directory  /usr/kvm-qemu-0.13.0/share/man
ELF interp prefix /usr/gnemul/qemu-%M
Source path       /sources/qemu-kvm-0.13.0
C compiler        gcc
Host C compiler   gcc
CFLAGS            -O2 -g
QEMU_CFLAGS       -m64 -fstack-protector-all -Wold-style-definition -I. -I$(SRC_PATH) -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing
LDFLAGS           -Wl,--warn-common -m64 -g -L/usr/X11R7.4/lib
make              make
install           install
host CPU          x86_64
host big endian   no
target list       x86_64-softmmu
tcg debug enabled no
Mon debug enabled no
gprof enabled     no
sparse enabled    no
strip binaries    yes
profiler          no
static build      no
-Werror enabled   no
SDL support       yes
curses support    yes
curl support      yes
check support     no
mingw32 support   no
Audio drivers     oss
Extra audio cards ac97 es1370 sb16
Block whitelist
Mixer emulation   no
VNC TLS support   no
VNC SASL support  yes
VNC JPEG support  yes
VNC PNG support   yes
VNC thread        no
xen support       no
CPU emulation     yes
brlapi support    no
bluez  support    no
Documentation     yes
NPTL support      yes
GUEST_BASE        yes
PIE user targets  no
vde support       no
IO thread         no
Linux AIO support no
ATTR/XATTR support yes
Install blobs     yes
KVM support       yes
KVM PIT support   yes
KVM device assig. yes
fdt support       no
preadv support    no
fdatasync         yes
uuid support      yes
vhost-net support yes
I code, therefore I am