On Mon, Apr 14, 2008 at 12:43:30PM +0300, Avi Kivity wrote:
> Michal Ludvig wrote:
> >Hi all,
> >
> >in short: CentOS 5 guest (32bit) crashes when I run "reboot" in the VM with
> >qemu message:
> >kvm_run: failed entry, reason 65535
> >kvm_run returned -8
> >
> >In dmesg is this message:
> >kvm: 23769: cpu0 kvm_set_msr_common: MSR_IA32_MC0_STATUS 0x0, nop
> >
> >Details:
> >KVM 65
> >Host is openSUSE 10.3 with my own 2.6.24, 64 bit
> >Guest is CentOS 5.1 with 2.6.18-53.1.14.el5, 32 bit
> >GCC 4.2.1 for module, GCC 3.3.3 for qemu
> >CPU "AMD Athlon(tm) 64 X2 Dual Core Processor 5600+"
> >
> >Everything works fine, except that I can't reboot the guest. In VNC it says
> >"md: stopping devices" and then Qemu exits with:
> >kvm_run: failed entry, reason 65535
> >kvm_run returned -8
> >
> >IIRC reboot used to work with kvm-64
> >
>
> I think two bugs are involved:
>
> - the guest invokes the triple-fault shutdown path, so it seems normal reboot
> doesn't work with iothread. Haven't looked as to why yet.
> - amd shutdown interception clears the vmcb, leaving asid == 0, which is
> illegal. Adding force_new_asid() fixes this. There are probably
> other issues with clearing the vmcb as well.
>
> Joerg, can you find out if the "vmcb is undefined" applies to the entire vmcb
> or just the guest saved state? Is there a way to
> differentiate between a guest initiated shutdown due to triple fault and the
> core melting down?
Only the state saved in the VMCB is undefined after an intercepted
shutdown event. I am not sure if I understand your second question, what
do you mean with "core melting down" vs. guest initiated shutdown?
Joerg
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