On Thu, Jun 06, 2013 at 01:35:13PM +0200, Stefan Pietsch wrote: > On 06.06.2013 08:42, Gleb Natapov wrote: > > On Wed, Jun 05, 2013 at 02:51:19PM +0200, Stefan Pietsch wrote: > >> On 05.06.2013 14:10, Gleb Natapov wrote: > >>> On Wed, Jun 05, 2013 at 01:57:25PM +0200, Stefan Pietsch wrote: > >>>> On 19.05.2013 14:32, Gleb Natapov wrote: > >>>>> On Sun, May 19, 2013 at 02:00:31AM +0100, Ben Hutchings wrote: > >>>>>> Dear KVM maintainers, it appears that there is a gap in x86 emulation, > >>>>>> at least on a 32-bit host. Stefan found this when running GRML, a live > >>>>>> distribution which can be downloaded from: > >>>>>> <http://download.grml.org/grml32-full_2013.02.iso>. His original > >>>>>> reported is at <http://bugs.debian.org/707257>. > >>>>>> > >>>>> Can you verify with latest linux.git HEAD? It works for me there on > >>>>> 64bit. There were a lot of problems fixed in this area in 3.9/3.10 time frame, > >>>>> so it would be helpful if you'll test 32bit before I install one myself. > >>>> > >>>> > >>>> Kernel version 3.9.4-1 (linux-image-3.9-1-686-pae) made things worse. > >>>> > >>>> The virtual machine tries to boot the kernel, but stops after a few > >>>> seconds and the kern.log shows: > >>> At what point does it stop? > >> > >> > >> The machine stops at: > >> > >> Performance Events: Broken PMU hardware detected, using software events > >> only. > >> Failed to access perfctr msr (MSR c1 is 0) > >> Enabling APIC mode: Flat. Using 1 I/O APICs > > Timer initialization is what comes next. > > > > I tried 32bit kernel compiled from kvm.git "next" (3.10.0-rc2+) branch and upstream > > qemu and I cannot reproduce the problem. The guest boots fine. > > > I had no success with the Debian kernel 3.10~rc4-1~exp1 (3.10-rc4-686-pae). > > The machine hangs after "Enabling APIC mode: Flat. Using 1 I/O APICs". OK, since it looks like it hangs during timer initialization can you try to disable kvmclock? Add -cpu qemu64,-kvmclock to your command line. Also can you provide the output of "cat /proc/cpuinfo" on your host? And complete serial output before hang. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
