On Thu, Jul 27, 2023 at 05:07:11PM +0100, Abdellatif El Khlifi wrote: > Add MM communication support using FF-A transport > > This feature allows accessing MM partitions services through > EFI MM communication protocol. MM partitions such as StandAlonneMM > or smm-gateway secure partitions which reside in secure world. > > An MM shared buffer and a door bell event are used to exchange > the data. > > The data is used by EFI services such as GetVariable()/SetVariable() > and copied from the communication buffer to the MM shared buffer. > > The secure partition is notified about availability of data in the > MM shared buffer by an FF-A message (door bell). > > On such event, MM SP can read the data and updates the MM shared > buffer with the response data. > > The response data is copied back to the communication buffer and > consumed by the EFI subsystem. > > MM communication protocol supports FF-A 64-bit direct messaging. > > Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhl...@arm.com> > Tested-by: Gowtham Suresh Kumar <gowtham.sureshku...@arm.com> > Reviewed-by: Simon Glass <s...@chromium.org> > Cc: Tom Rini <tr...@konsulko.com> > Cc: Ilias Apalodimas <ilias.apalodi...@linaro.org> > Cc: Jens Wiklander <jens.wiklan...@linaro.org> > > --- > > Changelog: > =============== > > v17: > > * show a debug message rather than an error when FF-A is not detected [snip] > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig > index c5835e6ef6..8fbadb9201 100644 > --- a/lib/efi_loader/Kconfig > +++ b/lib/efi_loader/Kconfig > @@ -55,13 +55,53 @@ config EFI_VARIABLE_FILE_STORE > stored as file /ubootefi.var on the EFI system partition. > > config EFI_MM_COMM_TEE > - bool "UEFI variables storage service via OP-TEE" > - depends on OPTEE > + bool "UEFI variables storage service via the trusted world" > + depends on OPTEE && ARM_FFA_TRANSPORT
You didn't get my changes in here however. If you can do EFI_MM_COMM_TEE without ARM_FFA_TRANSPORT (as lx2160ardb_tfa_stmm_defconfig does) then you don't make this option depend on EFI_MM_COMM_TEE. If FF-A is only for use here, you make FF-A depend on this, and the FF-A specific variable depend on ARM_FFA_TRANSPORT. -- Tom
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