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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