Date: Wed, 15 Jul 2015 00:02:17 -0700 From: Neel Natu <neelnatu@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: bhyve: centos 7.1 with multiple virtual processors Message-ID: <CAFgRE9GKPcqZHtgDVdY_Ph%2BDGCvWsNjB_Bj2JBGzT1duk5hSuQ@mail.gmail.com> In-Reply-To: <55A514D1.7040805@FreeBSD.org> References: <5587EE05.2020001@FreeBSD.org> <CAFgRE9Hpxm7pC_ETdQJKNk7FwbGvYjd60D0bnoOC=t46aJvusQ@mail.gmail.com> <558900A7.40609@FreeBSD.org> <CAFgRE9E5uTDUomaibL6jmxNwGJnz2RXiGxLDNoKkQ=%2BRBsh69A@mail.gmail.com> <55891335.5090403@FreeBSD.org> <55A514D1.7040805@FreeBSD.org>
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Hi Andriy, On Tue, Jul 14, 2015 at 6:55 AM, Andriy Gapon <avg@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
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