Problem running 8.1R on KVM with AMD hosts
jkim at FreeBSD.org
Thu Sep 30 22:56:00 UTC 2010
On Thursday 30 September 2010 02:57 pm, Luke Marsden wrote:
> Hi FreeBSD-stable,
> > > 1. Please, build your kernel with debug symbols.
> > > 2. Show kgdb output
> I could not convince the kernel to dump (it was looping forever but
> not panicing), but I have managed to compiled a kernel with
> debugging symbols and DDB which immediately drops into the debugger
> when the problem occurs, see screenshot at:
It seems MCA capability is advertised by the CPUID translator but
writing to the MSRs causes GPF. In other words, it seems like a CPU
emulator bug. A simple workaround is 'set hw.mca.enabled=0' from the
loader prompt. If it works, add hw.mca.enabled="0"
in /boot/loader.conf to make it permanent. MCA does not make any
sense in emulation any way.
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