Re: [Qemu-devel] About the light VM solution!

[Gonglei (Arei)]

> -----Original Message-----
> From: Qemu-devel
> [mailto:address@hidden On
> Behalf Of Stefan Hajnoczi
> Sent: Wednesday, December 06, 2017 12:31 AM
> To: Paolo Bonzini
> Cc: Yang Zhong; Stefan Hajnoczi; qemu-devel
> Subject: Re: [Qemu-devel] About the light VM solution!
> 
> On Tue, Dec 05, 2017 at 03:00:10PM +0100, Paolo Bonzini wrote:
> > On 05/12/2017 14:47, Stefan Hajnoczi wrote:
> > > On Tue, Dec 5, 2017 at 1:35 PM, Paolo Bonzini <address@hidden>
> wrote:
> > >> On 05/12/2017 13:06, Stefan Hajnoczi wrote:
> > >>> On Tue, Dec 05, 2017 at 02:33:13PM +0800, Yang Zhong wrote:
> > >>>> As you know, AWS has decided to switch to KVM in their clouds. This
> news make almost all
> > >>>> china CSPs(clouds service provider) pay more attention on KVM/Qemu,
> especially light VM
> > >>>> solution.
> > >>>>
> > >>>> Below are intel solution for light VM, qemu-lite.
> > >>>>
> http://events.linuxfoundation.org/sites/events/files/slides/Light%20weight%2
> 0virtualization%20with%20QEMU%26KVM_0.pdf
> > >>>>
> > >>>> My question is whether community has some plan to implement light
> VM or alternative solutions? If no, whether our
> > >>>> qemu-lite solution is suitable for upstream again? Many thanks!
> > >>>
> > >>> What caused a lot of discussion and held back progress was the approach
> > >>> that was taken.  The basic philosophy seems to be bypassing or
> > >>> special-casing components in order to avoid slow operations.  This
> > >>> requires special QEMU, firmware, and/or guest kernel binaries and
> causes
> > >>> extra work for the management stack, distributions, and testers.
> > >>
> > >> I think having a special firmware (be it qboot or a special-purpose
> > >> SeaBIOS) is acceptable.
> > >
> > > The work Marc Mari Barcelo did in 2015 showed that SeaBIOS can boot
> > > guests quickly.  The guest kernel was entered in <35 milliseconds
> > > IIRC.  Why is special firmware necessary?
> >
> > I thought that wasn't the "conventional" SeaBIOS, but rather one with
> > reduced configuration options, but I may be remembering wrong.
> 
> Marc didn't spend much time on optimizing SeaBIOS, he used the build
> options that were suggested.  An extra flag can be added in
> qemu_preinit() to skip slow init that's unnecessary on optimized
> machines.  That would allow a single SeaBIOS binary to run both full and
> lite systems.
> 
What's options do you remember? Stefan. Or any links about that
thread? I'm Interesting with this topic.

Thanks,
-Gonglei