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

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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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