On 11/08/2011 11:52 PM, Max Filippov wrote:
With kernel command line of 'console=ttyS0 noapic=1 panic=1' patched
qemu boots up successfully with -icount, whereas unpatched qemu loops
infinitely.
Looks like APIC emulation issue to me.
I'm trying to test issue using a 2.6.38 vmlinuz image.
The image is a kernel image of a another ubuntu guest. I just copy it to
host and use it directly.
# /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 1024 -kernel
vmlinuz-2.6.38-8-generic -append 'ro quiet noacpi=1 ' -chardev
stdio,id=mon0 -mon chardev=mon0
The kernel can be successfully loaded and run normally until
kernel_init(),and panic because there is no root file-system supplied.
But add -icount option:
# /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 1024 -kernel
vmlinuz-2.6.38-8-generic -append
'root=UUID=96bc04c5-410e-482a-82bf-95b2355552d6 ro quiet noacpi=1'
-chardev stdio,id=mon0 -mon chardev=mon0 -icount auto
The kernel can not be loaded successfully.
loop in main_loop_wait().
--
Best Regards,
Cao,Bing Bu
