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Groups > linux.kernel > #1256589
| From | "'Baoquan He'" <bhe@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option |
| Date | 2015-10-27 10:10 +0100 |
| Message-ID | <qo8qu-3ms-1@gated-at.bofh.it> (permalink) |
| References | <qczZ7-T1-7@gated-at.bofh.it> <qczZ8-T1-23@gated-at.bofh.it> <qo878-30x-1@gated-at.bofh.it> <qo8qu-3ms-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 10/27/15 at 09:01am, 河合英宏 / KAWAI，HIDEHIRO wrote: > Hi, > > > I just have a look at this thread. I am wondering why we don't use > > existing is_kdump_kernel() directly to disable external NMI if it's > > in kdump kernel. Then no need to introduce another boot option "noextnmi" > > which is used only for kdump kernel. > > As I stated in another mail, there is a case where we don't want to > mask external NMIs in the second kernel. So, we need some > configurable way. Please see the following quotation. Got it. Thanks for telling. > > > We souldn't enable this feature silently. Some users wouldn't like > > to enable this feature. For example, a user enables a watchdog timer > > which raises an external NMI when the counter is not reset for a > > specific duration. Then, the second kernel hangs up while saving > > crash dump, and NMI is delivered to the CPU. The kernel gets panic > > due to the NMI, prints some information to the display and serial > > console, and then automatically reboot. In this case, users don't > > want to block external NMIs. > > Regards, > > Hidehiro Kawai > Hitachi, Ltd. Research & Development Group > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option Baoquan He <bhe@redhat.com> - 2015-10-27 09:50 +0100 Re: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option "'Baoquan He'" <bhe@redhat.com> - 2015-10-27 10:10 +0100 RE: Re: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option 河合英宏 / KAWAI，HIDEHIRO <hidehiro.kawai.ez@hitachi.com> - 2015-10-27 10:10 +0100
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