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

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Message-ID: <4A8D90BB.2030506@redhat.com>
Date:	Thu, 20 Aug 2009 21:06:51 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Michael S. Tsirkin" <mst@...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 08/20/2009 08:55 PM, Michael S. Tsirkin wrote:
>
>> While we could argue about this my feeling is that we should drop this,
>> at least until we can quantify what benefit it has and whether there are
>> any Davide-acceptable alternatives.
>>
>> In the meanwhile, we can let vhost-net support edge-triggered interrupts
>> only, let qemu terminate those eventfds and convert then to
>> level-triggered interrupts (which it can then inject using the existing
>> ioctl).  It will keep vhost-net and kvm simpler at the cost of some
>> performance penalty to guests using level interrupts.  These suck anyway
>> so we'll point users at msi.
>>      
> I thought the point was to move assigned devices out of KVM?
>    

Grr.  Forgot about that.

That's much more important.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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