[M] Change in coreboot[master]: cpu/x86/smm: Add PCI resource store functionality

[Robert Zieba (Code Review)]

Attention is currently required from: Arthur Heymans, Robert Zieba, Raul Rangel, Nico Huber, Angel Pons, Karthik Ramasubramanian, Felix Held.

Hello Arthur Heymans, build bot (Jenkins), Martin Roth, Karthik Ramasubramanian, Felix Held,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/67931

to look at the new patch set (#13).

Change subject: cpu/x86/smm: Add PCI resource store functionality
......................................................................

cpu/x86/smm: Add PCI resource store functionality

In certain cases data within protected memmory areas like SMRAM could
be leaked or modified if an attacker remaps PCI BARs to point within
that area. Add support to the existing SMM runtime to allow storing
PCI resources in SMRAM and then later retrieving them.

BRANCH=guybrush
BUG=b:186792595
TEST=builds

Signed-off-by: Robert Zieba 
Change-Id: I23fb1e935dd1b89f1cc5c834cc2025f0fe5fda37
---
M src/cpu/x86/Kconfig
M src/cpu/x86/smm/Makefile.inc
A src/cpu/x86/smm/pci_resource_store.c
M src/cpu/x86/smm/smm_module_handler.c
M src/cpu/x86/smm/smm_module_loader.c
M src/include/cpu/x86/smm.h
6 files changed, 143 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/31/67931/13