Hi,
I'm trying to run a test environment in kvm (because uml doesn't have
lockdep), and am running into the following problems:
1) I get the $subject warning a lot, when starting kvm:
[85763.262707] BUG: using smp_processor_id() in preemptible [00000000] code: kvm/13877
[85763.262719] caller is kvm_write_guest_time+0x40/0x220 [kvm]
[85763.262722] Pid: 13877, comm: kvm Not tainted 2.6.30-wl-26837-g0ee651a-dirty #54
[85763.262725] Call Trace:
[85763.262729] [<ffffffff8041d482>] debug_smp_processor_id+0xf2/0x100
[85763.262741] [<ffffffffa0331390>] kvm_write_guest_time+0x40/0x220 [kvm]
[85763.262753] [<ffffffffa0331890>] vcpu_enter_guest+0x320/0x580 [kvm]
[85763.262780] [<ffffffffa03347f4>] __vcpu_run+0x74/0x2f0 [kvm]
[85763.262792] [<ffffffffa033571f>] kvm_arch_vcpu_ioctl_run+0x8f/0x200 [kvm]
[85763.262804] [<ffffffffa0329b48>] kvm_vcpu_ioctl+0x4b8/0x900 [kvm]
[85763.262816] [<ffffffff802f5216>] vfs_ioctl+0x36/0xb0
[85763.262819] [<ffffffff802f55f9>] do_vfs_ioctl+0x89/0x320
[85763.262826] [<ffffffff802f58df>] sys_ioctl+0x4f/0x80
[85763.262830] [<ffffffff8020b6fb>] system_call_fastpath+0x16/0x1b
That kernel version is wireless-testing, which is currently based on
v2.6.30, and the -dirty is for some wireless patches I did.
2) The second problem is that it doesn't actually work. I use this
command line:
kvm -kernel arch/x86_64/boot/bzImage \
-hda ../uml/Ubuntu-IntrepidIbex-amd64-root_fs \
-append "root=/dev/hda console=ttyS0" -curses
and the system hangs after
Plex86/Bochs VGABios (PCI) current-cvs 12 Jun 2009
This VGA/VBE Bios is released under the GNU LGPL
Please visit :
. http://bochs.sourceforge.net
. http://www.nongnu.org/vgabios
cirrus-compatible VGA is detected
QEMU BIOS - build: 06/12/09
$Revision: 1.182 $ $Date: 2007/08/01 17:09:51 $
Options: apmbios pcibios eltorito rombios32
ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (1024 MBytes)
ata1 master: QEMU DVD-ROM ATAPI-4 CD-Rom/DVD-Rom
Press F12 for boot menu.
Decompressing Linux... Parsing ELF... done.
Booting the kernel.
The guest kernel is the same as the host, but with somewhat different
config options.
The strange thing here is that the exact same command line, with
qemu-system-x86_64 instead of kvm works perfectly.
johannes
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