[XS] Change in coreboot[main]: soc/intel/meteorlake: Enable SSE2 accelerated RSA sign. verification

[Subrata Banik (Code Review)]

Subrata Banik has submitted this change. ( https://review.coreboot.org/c/coreboot/+/79291?usp=email )

Change subject: soc/intel/meteorlake: Enable SSE2 accelerated RSA sign. verification
......................................................................

soc/intel/meteorlake: Enable SSE2 accelerated RSA sign. verification

Enabling SSE2 accelerated RSA signature verification saves 4.7 ms of
boot time.

| modpow() function call     | original | SSE2 Algorithm 2 |
|----------------------------+----------+------------------|
| coreboot/verstage - step 1 |    6.644 |            3.042 |
| coreboot/verstage - step 2 |    1.891 |            0.757 |
|----------------------------+----------+------------------|
| Total (ms)                 |    8.535 |            3.799 |

BUG=b:312709384
TEST=modular exponentiation is more than twice faster on rex0

Change-Id: I382e62a765dbf2027c4ac54d6eb19a9542a8c302
Signed-off-by: Jeremy Compostella 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79291
Reviewed-by: Subrata Banik 
Tested-by: build bot (Jenkins) 
---
M src/soc/intel/meteorlake/Kconfig
1 file changed, 1 insertion(+), 0 deletions(-)

Approvals:
  Subrata Banik: Looks good to me, approved
  build bot (Jenkins): Verified

diff --git a/src/soc/intel/meteorlake/Kconfig b/src/soc/intel/meteorlake/Kconfig
index 756d499..5b78fdf 100644
--- a/src/soc/intel/meteorlake/Kconfig
+++ b/src/soc/intel/meteorlake/Kconfig
@@ -324,6 +324,7 @@
    select VBOOT_VBNV_CMOS
    select VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
    select VBOOT_X86_SHA256_ACCELERATION
+	select VBOOT_X86_RSA_ACCELERATION

# Default hash block size is 1KiB. Increasing it to 4KiB to improve
 # hashing time as well as read time.