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efi_loader: Increase default variable store size to 128K

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In commit 9fd3f881c6 ("efi_loader: Increase default variable store size to 64KiB")
Alper has a detailed explanation of why the size needs to be bumped to at
least 64K.  However enabling Secure boot, writing db, KEK, PK etc keys
will further increase the size so bump it to 128K.

It's worth noting that when U-Boot stores the EFI variables in an RPMB the
available storage is defined statically in StandAloneMM at build time.
The U-Boot code is detecting the available true size on the fly during
writes. When StandAloneMM is present this size defines the reserved
memory U-Boot can use to copy any runtime variables, before booting an
OS.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Ilias Apalodimas 2023-11-06 17:47:53 +02:00 committed by Heinrich Schuchardt
parent 9781ec9840
commit a8062549d6
1 changed files with 8 additions and 6 deletions
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14
lib/efi_loader/Kconfig
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@ -133,18 +133,20 @@ endif
config EFI_VAR_BUF_SIZE
int "Memory size of the UEFI variable store"
default 16384 if EFI_MM_COMM_TEE
default 65536
default 131072
range 4096 2147483647
help
This defines the size in bytes of the memory area reserved for keeping
UEFI variables.
When using StandAloneMM (CONFIG_EFI_MM_COMM_TEE=y) this value should
match the value of PcdFlashNvStorageVariableSize used to compile the
StandAloneMM module.
When using StandAloneMM (CONFIG_EFI_MM_COMM_TEE=y) is used the
available size for storing variables is defined in
PcdFlashNvStorageVariableSize.
That value is probed at runtime from U-Boot. In that case,
EFI_VAR_BUF_SIZE represents the memory U-Boot reserves to present
runtime variables to the OS.
Minimum 4096, default 65536, or 16384 when using StandAloneMM.
Minimum 4096, default 131072
config EFI_GET_TIME
bool "GetTime() runtime service"