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Re: [Qemu-devel] [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation
Date: Thu, 08 Dec 2011 10:42:27 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2011-12-07 11:29, Avi Kivity wrote:
> On 10/17/2011 06:00 PM, Lai Jiangshan wrote:
>> From: Lai Jiangshan <address@hidden>
>> Currently, NMI interrupt is blindly sent to all the vCPUs when NMI
>> button event happens. This doesn't properly emulate real hardware on
>> which NMI button event triggers LINT1. Because of this, NMI is sent to
>> the processor even when LINT1 is maskied in LVT. For example, this
>> causes the problem that kdump initiated by NMI sometimes doesn't work
>> on KVM, because kdump assumes NMI is masked on CPUs other than CPU0.
>> With this patch, inject-nmi request is handled as follows.
>> - When in-kernel irqchip is disabled, deliver LINT1 instead of NMI
>>   interrupt.
>> - When in-kernel irqchip is enabled, get the in-kernel LAPIC states
>>   and test the APIC_LVT_MASKED, if LINT1 is unmasked, and then
>>   delivering the NMI directly. (Suggested by Jan Kiszka)
>> Changed from old version:
>>   re-implement it by the Jan's suggestion.
>>   fix the race found by Jan.
> This patch fell through the cracks, sorry.  Now applied.

Lai, what is the state of a corresponding QEMU upstream patch? I'd like
to build on top of it for my upstream irqchip series.


Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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