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Re: [Qemu-devel] RFC: Universal encryption on QEMU I/O channels

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] RFC: Universal encryption on QEMU I/O channels
Date: Wed, 4 Feb 2015 15:26:23 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

On Wed, Feb 04, 2015 at 04:22:26PM +0100, Paolo Bonzini wrote:
> On 04/02/2015 16:11, Daniel P. Berrange wrote:
> > > For GIO/GIOChannel, you'd have to choose between zerocopy and many
> > > syscalls, or one copy and few syscalls.  Since every page has two iov
> > > entries, one of which is just 8 bytes, one copy and few syscalls is
> > > probably faster---but still only half the speed of writev.
> >
> > That could be an argument in favour of defining a QEMUIOChannel
> > instead. The use of GIOChannel is only compelling if we gain some
> > significant benefit from using the standard glib API in this scenario
> > and I'm not clear that we really do, other than developer familiarity
> > with glib.
> GIOChannel's advantage is that---even though it may not be used for
> regular migration---integration with chardev would be really easy.

If we did a QEMUIOChannel that was basically the same as IOChannel, but
with support for iovec writev/readv it'd mostly be drop-in replacement
for the chardev code I guess.

> > GIO could be compelling if we could leverage its TLS integration
> I agree.

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