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(parent: 3e23738) | patch
arm64: Disable fine grained traps on boot
authorMark Brown <broonie@kernel.org>
Thu, 1 Apr 2021 18:09:40 +0000 (19:09 +0100)
committerCatalin Marinas <catalin.marinas@arm.com>
Thu, 8 Apr 2021 17:39:18 +0000 (18:39 +0100)
commit31c00d2aeaa2da89361f5b64a64ca831433be5fc
treeee5b9c2400bebe5d0182c971f140220107168876tree | snapshot
parent3e237387bb76cbbd254e82fb1e996e2f3af9e6a7commit | diff
arm64: Disable fine grained traps on boot

The arm64 FEAT_FGT extension introduces a set of traps to EL2 for accesses
to small sets of registers and instructions from EL1 and EL0.  Currently
Linux makes no use of this feature, ensure that it is not active at boot by
disabling the traps during EL2 setup.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210401180942.35815-3-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/include/asm/el2_setup.h diff | blob | history
arch/arm64/include/asm/sysreg.h diff | blob | history
Domain: System / Kernel;