bhyve: centos 7.1 with multiple virtual processors

[Neel Natu]

Hi Andriy,

On Tue, Jul 14, 2015 at 6:55 AM, Andriy Gapon <avg at freebsd.org> wrote:
> On 23/06/2015 11:05, Andriy Gapon wrote:
>> On 23/06/2015 10:26, Neel Natu wrote:
> [snip]
>>> Does this ever happen with a single vcpu guest?
>>
>> Never seen the problem with a single CPU so far.
>> Also, never had that problem with FreeBSD guests.
>>
>>> The other mystery is the NMIs the host is receiving. I (re)verified to
>>> make sure that bhyve/vmm.ko do not assert NMIs so it has to be
>>> something else on the host that's doing it ...
>>
>> But the correlation with the multi-CPU non-FreeBSD guests seems to be significant.
>
> Today I've got another NMI with a Linux guest, but a few things were different:
> - the host was fresh after a reboot
> - the guest was single CPU
> - the NMI happened during boot up of the very first VM
>
> kernel: NMI ISA 2c, EISA ff
> kernel: NMI ... going to debugger
>
> Not what causes those NMIs but when they happen they always happen during a
> bhyve guest boot...
>

Could you update the host with the following patch?
https://people.freebsd.org/~neel/patches/ktr_stray_nmi.patch

It enables KTR_GEN logging by default and turns it off when a VM-exit
due to NMI is detected. If there is a pattern to the NMIs then it can
be correlated with the guest activity around that time.

best
Neel

> --
> Andriy Gapon