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MPAM: enable MPAM EL2 traps

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Complete the MPAM enablement in TF-A for lower ELs by enabling the EL2
traps in MPAMHCR_EL2 and MPAM2_EL2.This prevents an
MPAM-unaware-hypervisor to be restricted by an MPAM-aware-guest.

Change-Id: I47bf3f833fa22baa590f83d49cc0e3f2974e698d
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
This commit is contained in:
Louis Mayencourt 2019-02-11 11:25:50 +00:00
parent 1baa28bb2d
commit 537fa85917
2 changed files with 12 additions and 0 deletions
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4
include/arch/aarch64/arch.h
View file

@ -782,6 +782,10 @@
/* MPAM register definitions */
#define MPAM3_EL3_MPAMEN_BIT (ULL(1) << 63)
#define MPAMHCR_EL2_TRAP_MPAMIDR_EL1 (ULL(1) << 31)
#define MPAM2_EL2_TRAPMPAM0EL1 (ULL(1) << 49)
#define MPAM2_EL2_TRAPMPAM1EL1 (ULL(1) << 48)
#define MPAMIDR_HAS_HCR_BIT (ULL(1) << 17)

8
lib/extensions/mpam/mpam.c
View file

@ -31,11 +31,19 @@ void mpam_enable(bool el2_unused)
/*
* If EL2 is implemented but unused, disable trapping to EL2 when lower
* ELs access their own MPAM registers.
* If EL2 is implemented and used, enable trapping to EL2.
*/
if (el2_unused) {
write_mpam2_el2(0);
if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U)
write_mpamhcr_el2(0);
} else {
write_mpam2_el2(MPAM2_EL2_TRAPMPAM0EL1 |
MPAM2_EL2_TRAPMPAM1EL1);
if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U) {
write_mpamhcr_el2(MPAMHCR_EL2_TRAP_MPAMIDR_EL1);
}
}
}