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

[Avi Kivity]

Herbert Xu wrote:
> Anthony Liguori <anthony@xxxxxxxxxxxxx> 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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