diff options
| author | Alexandru Elisei <alexandru.elisei@arm.com> | 2021-08-24 16:45:23 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-08-26 11:35:09 +0100 |
| commit | 50cb99fa89aa2bec2cab2f9917010bbd7769bfa3 (patch) | |
| tree | 848a58f22bec7c6ca711370f8014531801ad4818 /arch/arm64/include | |
| parent | 5845e703f9b5f949dc1db4122b7fc6d8563048a2 (diff) | |
| download | linux-50cb99fa89aa2bec2cab2f9917010bbd7769bfa3.tar.gz | |
arm64: Do not trap PMSNEVFR_EL1
Commit 31c00d2aeaa2 ("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: 31c00d2aeaa2 ("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>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/el2_setup.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h index 21fa330f498d..29bcd791f793 100644 --- a/arch/arm64/include/asm/el2_setup.h +++ b/arch/arm64/include/asm/el2_setup.h @@ -150,8 +150,17 @@ ubfx x1, x1, #ID_AA64MMFR0_FGT_SHIFT, #4 cbz x1, .Lskip_fgt_\@ - msr_s SYS_HDFGRTR_EL2, xzr - msr_s SYS_HDFGWTR_EL2, xzr + mov x0, xzr + mrs x1, id_aa64dfr0_el1 + ubfx x1, x1, #ID_AA64DFR0_PMSVER_SHIFT, #4 + cmp x1, #3 + b.lt .Lset_fgt_\@ + /* Disable PMSNEVFR_EL1 read and write traps */ + orr x0, x0, #(1 << 62) + +.Lset_fgt_\@: + msr_s SYS_HDFGRTR_EL2, x0 + msr_s SYS_HDFGWTR_EL2, x0 msr_s SYS_HFGRTR_EL2, xzr msr_s SYS_HFGWTR_EL2, xzr msr_s SYS_HFGITR_EL2, xzr |