From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: "Yang, Sheng" <sheng.yang@intel.com>, kvm-devel <kvm@vger.kernel.org>
Subject: Re: VMX: Host NMI triggering on NMI vmexit
Date: Fri, 19 Sep 2008 15:37:37 -0700 [thread overview]
Message-ID: <48D429B1.6090105@redhat.com> (raw)
In-Reply-To: <48CF97F1.9090004@siemens.com>
Jan Kiszka wrote:
> Sheng,
>
> out of curiosity: vmx_vcpu_run invokes 'int $2' to trigger a host NMI if
> the VM exited due to an external NMI event. According to Intel specs I
> have, software-triggered NMIs do not block hardware NMIs. So are we
> facing the risk to receive another NMI while running the first handler?
> Or will the VM be left with the hardware blocking logic armed? Or does
> Linux not care about NMI handler re-entrance?
>
All good questions. Usually this doesn't happen since NMI sources are
far apart (oprofile, watchdog).
Maybe the answer is to generate the local nmi via an IPI-to-self command
to the local apic.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2008-09-19 22:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-16 11:26 VMX: Host NMI triggering on NMI vmexit Jan Kiszka
2008-09-19 22:37 ` Avi Kivity [this message]
2008-09-20 6:55 ` Jan Kiszka
2008-09-22 10:54 ` Jan Kiszka
2008-09-22 11:00 ` Avi Kivity
2008-09-23 5:34 ` Yang, Sheng
2008-09-23 8:47 ` Jan Kiszka
2008-09-23 8:57 ` Yang, Sheng
2008-09-23 8:59 ` Jan Kiszka
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