diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-02-08 09:57:19 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-09 13:47:12 +0000 |
| commit | 8f266a5d878ad38fbd43e41e22847650f51d4734 (patch) | |
| tree | c5f381423fd8e4e52a67fb014b1c81644ebd9bcf /arch/arm64/include | |
| parent | d077cb3cb90470f8bd7dbe357a474e13589390b9 (diff) | |
arm64: cpufeature: Add global feature override facility
Add a facility to globally override a feature, no matter what
the HW says. Yes, this sounds dangerous, but we do respect the
"safe" value for a given feature. This doesn't mean the user
doesn't need to know what they are doing.
Nothing uses this yet, so we are pretty safe. For now.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-11-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9a555809b89c..b1f53147e2b2 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -63,6 +63,11 @@ struct arm64_ftr_bits { s64 safe_val; /* safe value for FTR_EXACT features */ }; +struct arm64_ftr_override { + u64 val; + u64 mask; +}; + /* * @arm64_ftr_reg - Feature register * @strict_mask Bits which should match across all CPUs for sanity. @@ -74,6 +79,7 @@ struct arm64_ftr_reg { u64 user_mask; u64 sys_val; u64 user_val; + struct arm64_ftr_override *override; const struct arm64_ftr_bits *ftr_bits; }; |