linux-kernel - Re: [PATCH 12/45] KVM: x86: Support for user space injected NMIs

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Message-ID: <493F88E3.1010201@siemens.com>
Date:	Wed, 10 Dec 2008 10:16:19 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/45] KVM: x86: Support for user space injected NMIs

Avi Kivity wrote:
> Jan Kiszka wrote:
>> Avi Kivity wrote:
>>  
>>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>>
>>> Introduces the KVM_NMI IOCTL to the generic x86 part of KVM for
>>> injecting NMIs from user space and also extends the statistic report
>>> accordingly.
>>>     
>> Avi, please consider [1] again. You've already merged the related user
>> space cleanup, and I was just waiting for your comment on how to deal
>> with the kernel part, ideally _before_ merging the superfluous
>> ready_for/request NMI interface into mainline.
>>
>> Thanks,
>> Jan
>>
>> [1] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/25016
>>
>>   
> 
> Do you mean, drop these nmi window bits completely from 2.6.29, keeping
> just injection?  We can do that without breaking released userspace by
> dropping KVM_CAP_NMI and adding KVM_CAP_NMI2 (better name?) that doesn't
> have interrupt window support.

KVM_CAP_USER_NMI

> 
> This means that userspace versions that supported KVM_CAP_NMI will not
> work with 2.6.29, but I think we can live with that.
> 
> If this is acceptable, please send a patch that converts KVM_CAP_NMI to
> KVM_CAP_NMI2, and a corresponding patch for userspace.  I will fold the
> kernel patch into the 2.6.29 submission, and apply both patches to the
> master branch.

OK, sounds reasonable. I will work out such patches.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 26
Corporate Competence Center Embedded Linux
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