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SPM: Do not trap S-EL0 access to SVE/SIMD/FP regs 

This allows secure partitions to access these registers. This is
needed in some cases. For example, it has been reported that in order
to implement secure storage services, a secure partition needs to
encrypt/decrypt some authentication variables, which requires FP/SIMD
support.

Note that SPM will not do any saving/restoring of these registers on
behalf of the SP. This falls under the SP's responsibility.

Also note that if the SP gets preempted, it might not get a chance to
save/restore FP/SIMD registers first. This patch does not address this
problem. It only serves as a temporary solution to unblock development
on the secure partition side.

Change-Id: I3b8ccdebdac0219f6ac96ad66ab2be0be8374ad3
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
This commit is contained in:
Sandrine Bailleux 2018-05-09 14:45:34 +02:00
parent 885ca54a75
commit 398489452f
1 changed files with 4 additions and 2 deletions
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6
services/std_svc/spm/secure_partition_setup.c
View File

@ -236,12 +236,14 @@ void secure_partition_setup(void)
SPM_SHIM_EXCEPTIONS_PTR);
/*
* FPEN: Forbid the Secure Partition to access FP/SIMD registers.
* FPEN: Allow the Secure Partition to access FP/SIMD registers.
* Note that SPM will not do any saving/restoring of these registers on
* behalf of the SP. This falls under the SP's responsibility.
* TTA: Enable access to trace registers.
* ZEN (v8.2): Trap SVE instructions and access to SVE registers.
*/
write_ctx_reg(get_sysregs_ctx(ctx), CTX_CPACR_EL1,
CPACR_EL1_FPEN(CPACR_EL1_FP_TRAP_ALL));
CPACR_EL1_FPEN(CPACR_EL1_FP_TRAP_NONE));
/*
* Prepare information in buffer shared between EL3 and S-EL0