[ kvm-Bugs-2944508 ] QEMU (0.12.2) startup problem with kvm and flag -no-reboot

* [ kvm-Bugs-2944508 ] QEMU (0.12.2) startup problem with kvm and flag -no-reboot
@ 2010-02-10 17:11 SourceForge.net
  0 siblings, 0 replies; 5+ messages in thread
From: SourceForge.net @ 2010-02-10 17:11 UTC (permalink / raw)
  To: noreply

Bugs item #2944508, was opened at 2010-02-02 03:46
Message generated for change (Comment added) made by iggy_cav
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2944508&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: qemu
Group: None
Status: Pending
Resolution: None
Priority: 5
Private: No
Submitted By: Marcel Kern (nsnkern)
Assigned to: Nobody/Anonymous (nobody)
Summary: QEMU (0.12.2) startup problem with kvm and flag -no-reboot

Initial Comment:
Problem description:
---------------------------------------
QEMU (0.12.2) does not startup (not even one output message is displayed e.g. from BIOS boot etc.) if flag "-no-reboot" and kvm support is enabled. QEMU immediately quits if the following startup configuration is used.

QEMU:
qemu-0.12.2 (or qemu-kvm-0.12.2) 
(Note: qemu-kvm-0.11.1 is working fine)

Not working anymore case:
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-pit -enable-kvm
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-pit -no-kvm-irqchip -enable-kvm
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-irqchip -enable-kvm

Working case:
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-pit -no-kvm
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-pit -no-kvm-irqchip -no-kvm
[]$ qemu-system-x86_64 -kernel bzImage -initrd rootfs.cpio.gz -no-reboot -no-kvm-irqchip -no-kvm

Environment description:
--------------------------------------------

cpuinfo:
Intel(R) Xeon(R) CPU           L5520  @ 2.27GHz

OS Host:
Red Hat Enterprise Linux Server release 5.4 (Tikanga) (x86_64)

[]$ uname -a
Linux 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

RedHat KVM Kernel Module is used:
[]$ ll /lib/modules/2.6.18-164.el5/weak-updates/kmod-kvm/
ksm.ko -> /lib/modules/2.6.18-164.6.1.el5/extra/kmod-kvm/ksm.ko
kvm-amd.ko -> /lib/modules/2.6.18-164.6.1.el5/extra/kmod-kvm/kvm-amd.ko
kvm-intel.ko -> /lib/modules/2.6.18-164.6.1.el5/extra/kmod-kvm/kvm-intel.ko
kvm.ko -> /lib/modules/2.6.18-164.6.1.el5/extra/kmod-kvm/kvm.ko

OS Guest:
Linux (Kernel 2.6.29  - 32-bit)

----------------------------------------------------------------------

>Comment By: Brian Jackson (iggy_cav)
Date: 2010-02-10 11:11

Message:
-enable-kvm doesn't do anything in qemu-kvm. Only in upstream qemu. If
that's where you are seeing this issue, you need to file a bug with
upstream.

----------------------------------------------------------------------

Comment By: Marcel Kern (nsnkern)
Date: 2010-02-10 09:50

Message:
Unfortunately still the same:

Not working case:
qemu-system-x86_64 -kernel bzImage -initrd rootfs -enable-kvm -no-reboot

Working case:
qemu-system-x86_64 -kernel bzImage -initrd rootfs -no-reboot

and of course this works also:
qemu-system-x86_64 -kernel bzImage -initrd rootfs -enable-kvm

It seems the problem is the kvm module which is in use with the RedHat
version mentioned above, because with kvm-88 (manually compiled) it works.
Some debugging showed that there is occurs a timeout inside the qemu main
loop, so the qemu exit is without an error but qemu does not startup at
all.

Any ideas?

----------------------------------------------------------------------

Comment By: Brian Jackson (iggy_cav)
Date: 2010-02-08 14:13

Message:
Have you tried without the -no-kvm-pit and -no-kvm-irqchip

The following runs fine here with the latest qemu-kvm.git, so it's either
fixed or it's one of those options

kvm -no-reboot -kernel /boot/vmlinuz-2.6.32-trunk-amd64 -initrd
/boot/initrd.img-2.6.32-trunk-amd64 -vnc :0

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2944508&group_id=180599

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