From: David Hildenbrand <david@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: mingo@kernel.org, x86@kernel.org,
Tiantian Feng <fengtiantian@huawei.com>,
Xishi Qiu <qiuxishi@huawei.com>
Subject: Re: [PATCH v5] x86: call smp vmxoff in smp stop
Date: Thu, 20 Apr 2017 12:01:33 +0200 [thread overview]
Message-ID: <b5e340a1-c3de-6a44-50ce-68388c89febc@redhat.com> (raw)
In-Reply-To: <20170419161839.30550-1-pbonzini@redhat.com>
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
next prev parent reply other threads:[~2017-04-20 10:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-19 16:18 Paolo Bonzini
2017-04-20 10:01 ` David Hildenbrand [this message]
2017-04-20 10:13 ` Paolo Bonzini
2017-04-20 11:09 ` David Hildenbrand
2017-04-20 11:16 ` [tip:x86/boot] x86/reboot: Turn off KVM when halting a CPU tip-bot for Tiantian Feng
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