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 <pbonz...@redhat.com> 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%20virtualization%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. Stefan
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