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| From | David Hildenbrand <david@redhat.com> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v5] x86: call smp vmxoff in smp stop |
| Date | Thu, 20 Apr 2017 12:10:02 +0200 |
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| X-Original-Cc | mingo@kernel.org, x86@kernel.org, Tiantian Feng <fengtiantian@huawei.com>, Xishi Qiu <qiuxishi@huawei.com> |
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On 19.04.2017 18:18, Paolo Bonzini wrote: > From: Tiantian Feng <fengtiantian@huawei.com> > > A CPU in VMX root mode will ignore INIT signals and fail to bring > up the APs after reboot. Therefore, on a panic we disable VMX on all > CPUs before rebooting or triggering kdump. > > Do this when halting the machine as well, in case a firmware-level reboot > does not perform a cold reset for all processors. Without doing this, > rebooting the host may hang. Guess this make sense, just wonder if something like that is actually expected to work? Not doing a cold reset feels like leaving a lot of stuff in an uninitialized state. Shouldn't that specific firmware then care about performing any necessary resets? -- Thanks, David
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[PATCH v5] x86: call smp vmxoff in smp stop Paolo Bonzini <pbonzini@redhat.com> - 2017-04-19 18:20 +0200
Re: [PATCH v5] x86: call smp vmxoff in smp stop David Hildenbrand <david@redhat.com> - 2017-04-20 12:10 +0200
Re: [PATCH v5] x86: call smp vmxoff in smp stop Paolo Bonzini <pbonzini@redhat.com> - 2017-04-20 12:20 +0200
Re: [PATCH v5] x86: call smp vmxoff in smp stop David Hildenbrand <david@redhat.com> - 2017-04-20 13:10 +0200
[tip:x86/boot] x86/reboot: Turn off KVM when halting a CPU tip-bot for Tiantian Feng <tipbot@zytor.com> - 2017-04-20 13:30 +0200
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