Re: [Xen-devel] fixed location of share info page in HVM guests

[Olaf Hering <olaf@xxxxxxxxx>]

On Tue, Aug 28, Keir Fraser wrote:

> Okay, that was a bit too clever, trying to hide between IOAPIC and LAPIC
> pages. How about a bit lower in memory -- FE700000-FE7FFFFF?
> 
> Everything in range FC000000-FFFFFFFF should already be marked
> E820_RESERVED. You can test that, and also see
> tools/firmware/hvmloader/e820.c:build_e820_table() (and note that
> RESERVED_MEMBASE == FC000000).

Yes, FC000000-FFFFFFFF has already an E820_RESERVED entry. Within that
range the kernel finds the IOAPIC, LAPIC and the HPET, perhaps because
they are listed in the ACPI table or because they are found by other
ways.

To make the location of the of the shared pages configurable from the
tools, does tools/firmware/hvmloader/acpi/dsdt.asl have a way to
describe such special region? Maybe the kernel parses that table early
enough, before the shared_info page gets used.

Olaf

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