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

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Message-ID: <493F81E9.90306@redhat.com>
Date:	Wed, 10 Dec 2008 10:46:33 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/45] KVM: x86: Support for user space injected NMIs

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.

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.

-- 
error compiling committee.c: too many arguments to function

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