linux-kernel - Re: [RFC PATCH 00/17] virtual-bus

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Message-ID: <49D45F59.9030100@redhat.com>
Date:	Thu, 02 Apr 2009 09:46:49 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Anthony Liguori <anthony@...emonkey.ws>, andi@...stfloor.org,
	ghaskins@...ell.com, linux-kernel@...r.kernel.org, agraf@...e.de,
	pmullaney@...ell.com, pmorreale@...ell.com, rusty@...tcorp.com.au,
	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 00/17] virtual-bus

Herbert Xu wrote:
> Anthony Liguori <anthony@...emonkey.ws> wrote:
>   
>> That said, I don't think we're bound today by the fact that we're in 
>> userspace.  Rather we're bound by the interfaces we have between the 
>> host kernel and userspace to generate IO.  I'd rather fix those 
>> interfaces than put more stuff in the kernel.
>>     
>
> I'm sorry but I totally disagree with that.  By having our IO
> infrastructure in user-space we've basically given up the main
> advantage of kvm, which is that the physical drivers operate in
> the same environment as the hypervisor.
>   

I don't understand this.  If we had good interfaces, all that userspace 
would do is translate guest physical addresses to host physical 
addresses, and translate the guest->host protocol to host API calls.  I 
don't see anything there that benefits from being in the kernel.

Can you elaborate?

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

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