arm64: Do not trap PMSNEVFR_EL1

mainline inclusion
from mainline-v5.15-rc1
commit 50cb99fa
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8E73O
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=50cb99fa89aa2bec2cab2f9917010bbd7769bfa3



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Commit 31c00d2a ("arm64: Disable fine grained traps on boot") zeroed
the fine grained trap registers to prevent unwanted register traps from
occuring. However, for the PMSNEVFR_EL1 register, the corresponding
HDFG{R,W}TR_EL2.nPMSNEVFR_EL1 fields must be 1 to disable trapping. Set
both fields to 1 if FEAT_SPEv1p2 is detected to disable read and write
traps.

Fixes: 31c00d2a ("arm64: Disable fine grained traps on boot")
Cc: <stable@vger.kernel.org> # 5.13.x
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210824154523.906270-1-alexandru.elisei@arm.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Conflict:
  arch/arm64/include/asm/el2_setup.h does not exist
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>