linux-kernel - Re: [PATCH 0/2] eventfd: new EFD

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Date:	Sun, 23 Aug 2009 16:36:21 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>, gleb@...hat.com,
	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag

On Sun, Aug 23, 2009 at 04:01:29PM +0300, Avi Kivity wrote:
> On 08/20/2009 09:28 PM, Michael S. Tsirkin wrote:
>>>> I thought the point was to move assigned devices out of KVM?
>>>>
>>>>        
>>> Grr.  Forgot about that.
>>>
>>> That's much more important.
>>>      
>> Looks like we'll have do with a separate char device or
>> something?
>>    
>
> We can still tunnel it through userspace.

More important here is realization that eventfd is a mutex/semaphore
implementation, not a generic event reporting interface as we are trying
to use it.

> Most assigned devices will  
> have MSI.  uio can signal the eventfd when the level changes, qemu can  
> read the level and write it to kvm.
> -- 
> error compiling committee.c: too many arguments to function
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