Re: [Xen-devel] [RFC] Hypervisor, x86 emulation deprivileged

[Tim Deegan <tim@xxxxxxx>]

At 07:59 +0000 on 06 Jul (1467791951), Paul Durrant wrote:
> > -----Original Message-----
> > From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of
> > Andrew Cooper
> > Sent: 05 July 2016 18:26
> > To: Anthony Perard; xen-devel@xxxxxxxxxxxxx; Jan Beulich
> > Subject: Re: [Xen-devel] [RFC] Hypervisor, x86 emulation deprivileged
> > 
> > On 05/07/16 12:22, Anthony PERARD wrote:
> > > Hi,
> > >
> > > I've taken over the work from Ben to have a deprivileged mode in the
> > > hypervisor, but I'm unsure about which direction to take.
> > 
> > You should begin with an evaluation of available options, identifying
> > which issues are mitigated, those which are not, and which which new
> > risks are introduced.
> > 
> 
> Personally I can't see why we want to invent a new way of executing
> code in the hypervisor. What's wrong with modelling each emulator as a
> PV unikernel, running with all the usual domain and vcpu constructs?

It would be useful to compare a unikernel/minios implementation of
this toy service to the other three.  I'd expect it to be slower
because of the extra context switch, but maybe directed yields could
help with that?

Tim.

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