Re: [Qemu-devel] [RFC 0/9] Introduce light weight PC platform pc-lite

[Chao Peng]

> 
> The combination of devices removed/supported seems a bit arbitrary to me.
> The use in this text of "legacy" and non-"legacy" is also arbitrary if not 
> given a definition.

The criterial here is to remove the devices that have poor performance.
You can think legacy devices here as ISA devices. Most of them are
emulated with slow port IO and slow line-based IRQ handling.

> 
> What is the use case of this new platform?

You can have a look at Clear containers
(https://clearlinux.org/features/clear-containers) or other similar
technologies. Basically they try to provide container-like service with
VT to improve security. Clear containers employ kvm-tool to gain 'lite'
benefit. This patch however try to achive the same with QEMU.

> 
> Care to share your numbers about how FAST is FAST? Like how much time you 
> need to boot from qemu launch to the guest being booted, and on which 
> hardware, and which guest kernel configuration?

Kernel .config is already listed in the repo I listed below. For
guest kernel and BIOS performance data please see another reply to mst.
QEMU bootup time itself however is mainly not improved with this
patchset, but the optmized QEMU normally we see takes ~45ms.

Thanks,
Chao

> 
> Ciao,
> 
> Claudio
> 
> > 
> > Please follow https://github.com/chao-p/qemu-lite-tools.
> > 
> > Thanks,
> > Chao