[S] Change in coreboot[main]: soc/amd/common/psp_verstage: Add PSP_VERSTACK_STACK_IS_MAPPED config

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Felix Held, Fred Reitberger, Jason Glenesk, Matt DeVillier.

Hello Felix Held, Fred Reitberger, Jason Glenesk, Matt DeVillier,

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

https://review.coreboot.org/c/coreboot/+/78426?usp=email

to look at the new patch set (#2).

Change subject: soc/amd/common/psp_verstage: Add PSP_VERSTACK_STACK_IS_MAPPED config
......................................................................

soc/amd/common/psp_verstage: Add PSP_VERSTACK_STACK_IS_MAPPED config

Crypto Engine in PSP prefers the buffer from Static RAM (SRAM). Hence if
a buffer comes from within SRAM address range, then it is passed
directly to Crypto Engine. Otherwise a bounce bufer from the stack is
used. But on SoCs like Picasso where PSP Verstage stack is mapped to a
virtual address space this check fails causing a bounce buffer to be
used and hence a stack overflow. Fix this issue by assuming that the
buffer comes from the SRAM always in such SoCs and pass the buffer
directly to crypto engine.

BUG=b:259649666
TEST=Build and boot to OS in Dalboz with unsigned PSP verstage.

Change-Id: I2161c8f0720c770efa5c05aece9584c3cbe7712a
Signed-off-by: Karthikeyan Ramasubramanian 
---
M src/soc/amd/common/psp_verstage/Kconfig
M src/soc/amd/common/psp_verstage/vboot_crypto.c
2 files changed, 12 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/26/78426/2