Re: [Qemu-devel] [RFC PATCH 00/40] Sneak peek of virtio and dataplane changes for 2.6

[Paolo Bonzini]

On 26/11/2015 11:39, Paolo Bonzini wrote:
> I would really prefer to get rid of vring.c as soon as the infrastructure
> makes it possible---even if it's faster. We know what makes virtio.c
> slower, and it's simpler to fix virtio.c than to convert all the other
> models to vring.c _plus_ make vring.c safe for migration.

I've now pushed some optimizations of exec.c to the same place (branch
dataplane, git://github.com/bonzini/qemu.git).  Basically if the length
of an address_space_read is constant, and the target ends up being RAM,
the compiler can inline address_space_read in the caller and in
particular eliminate the memcpy.

Paolo