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soc/intel/common: Add configs for TME exclusion range and new key gen 

Add following config options.

1. TME_GENERATE_NEW_KEY_ON_WARM_BOOT
   Program Intel TME to generate a new key for each warm boot. TME
   always generates a new key on each cold boot. With this option
   enabled TME generates a new key even in warm boot. Without this
   option TME reuses the key for warm boot.

2. TME_EXCLUDE_CBMEM_ENCRYPTION
   This option allows to exclude the CBMEM region from being encrypted
   by Intel TME. When TME is enabled it encrypts whole DRAM. TME
   provides option to carve out a region of physical memory to get
   excluded from encryption. With this config enabled, CBMEM region
   does not get encrypted by TME. If TME is not programmed to generate
   a new key in warm boot, exclusion range does not need be programmed
   due to the fact that TME uses same key in warm boot if
   TME_GENERATE_NEW_KEY_ON_WARM_BOOT is not set. But if TME is
   programmed to generate a new key in warm boot, contents of the CBMEM
   get encrypted with a new key in each warm boot case hence, that leads
   to loss of CBMEM data from previous warm boot. So enabling this
   config allows CBMEM region to get excluded from being encrypted and
   can be accessible irrespective of the type of the platform reset.

Bug=b:276120526
TEST=Able to build rex

Signed-off-by: Pratikkumar Prajapati <pratikkumar.v.prajapati@intel.com>
Change-Id: Id5008fee07b97faadc7dd585f445295425173782
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75625
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Pratikkumar Prajapati 2023-06-05 18:13:16 -07:00 committed by Felix Held
parent 4162654f1b
commit 42f7dc7493
1 changed files with 29 additions and 0 deletions
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29
src/soc/intel/common/block/cpu/Kconfig
View File

@ -142,6 +142,35 @@ config INTEL_TME
it would get enabled. If CPU supports MKTME, this same config option
enables MKTME.
config TME_GENERATE_NEW_KEY_ON_WARM_BOOT
bool "Generate new TME key on each warm boot"
depends on INTEL_TME
default n
help
Program Intel TME to generate a new key for each warm boot. TME always
generates a new key on each cold boot. With this option enabled TME
generates a new key even in warm boot. Without this option TME reuses
the key for warm boot.
config TME_EXCLUDE_CBMEM_ENCRYPTION
bool "Exclude CBMEM from TME encryption"
depends on INTEL_TME
default n
help
This option allows to exclude the CBMEM region from being encrypted by
Intel TME. When TME is enabled it encrypts whole DRAM. TME provides
option to carve out a region of physical memory to get excluded from
encryption. With this config enabled, CBMEM region does not get
encrypted by TME. If TME is not programmed to generate a new key in
warm boot, exclusion range does not need be programmed due to the
fact that TME uses same key in warm boot if
TME_GENERATE_NEW_KEY_ON_WARM_BOOT is not set. But if TME is programmed
to generate a new key in warm boot, contents of the CBMEM get
encrypted with a new key in each warm boot case hence, that leads to
loss of CBMEM data from previous warm boot. So enabling this config
allows CBMEM region to get excluded from being encrypted and can be
accessible irrespective of the type of the platform reset.
config CPU_XTAL_HZ
int
help