[Xen-devel] Passing Xen memory map and resource map to OVMF

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Hi all

Currently OVMF determines memory size by consulting CMOS, then it makes
up memory map of its own.

Consulting memory size by reading CMOS limits the RAM size to 1TB as
there's only 3 bytes from 0x5b-0x5d in CMOS, where the upper memory size
is stored.

And from Xen's point of view, OVMF should use the memory mapped passed
by hypervisor (from hvmloader) instead of making up its own.

To solve the above two problems all in one go, I plan to pass necessary
information (io resource, mmio resource) to OVMF from Xen.  I will
construct the table / structure in hvmloader then hook up platform pei
code when OVMF is running on Xen.

The first thing that comes in mind is to reuse E820 table for memory map
plus some extra fields for io / mmio resources. But I guess UEFI is the
new world so stuffs like E820 from old world will be less popular. Any
suggestion on existing table / data structure I can use?


Thanks
Wei.

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