[edk2-devel] [PATCH 00/17] [RFC] OvmfPkg: Add support for microvm machine type

[Gerd Hoffmann]

On Tue, Aug 31, 2021 at 10:31:31AM +0000, Yao, Jiewen wrote:
> Hi Gerd
> I would like to confirm a couple of things:
> 
> -1) Since this is a big new feature, please follow process to submit Bugzilla.
> 
> 0) I hope we can include a readme file to introduce more background and the scope of the new project.

Sure, will do both.

> 1) What is the device list of microvm?

It is a minimal virtual machine designed for modern (aka virtio-aware) guests.
Most legacy isa devices (pic, pit, rtc) are optional and can be turned
off.  storage/network/etc. uses virtio-mmio.

Optional pcie support is available and any pcie device supported by qemu
cane plugged in (including virtio-pci if you prefer that over
virtio-mmio).

> Or do you mean https://qemu.readthedocs.io/en/latest/system/i386/microvm.html?

Yes, it's this.

> 2) How many QEMU configurations do we want to support?

This series adds just the basics.  I want add support for virtio-mmio
and pcie later on, once the basics are sorted and merged.

> 3) What is the reason to add a new dsc/fdf instead of add a MACRO/PCD in OVMF?

microvm borrowed a bunch of ideas from arm virt.  So it doesn't work
like a classic pc chipset in many areas.  There is no pci config space
access via ioport 0xcf8 for example.  Also power management works
completely different (see patch #14).

Adapting at runtime would need glue code basically switching between
between different *Lib implementations, depending on machine type.
Similar to DxePciLibI440FxQ35 for pci / pcie, but for a bunch of more
places too.

Xen moved to a separate dsc/fdf too recently, I suspect for simliar
reasons.

take care,
  Gerd



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