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| author | Mark Brown <broonie@kernel.org> | 2024-02-13 18:32:46 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-02-22 22:39:34 +0300 |
| commit | 93576e34988757ed431e305ba9d3597e46dffe6b (patch) | |
| tree | 9805cd3eaa962c76ef6cf7320fdc5b5fdea6794d | |
| parent | 2f0090549b649cc9fd61c0193189c25f8fc03119 (diff) | |
| download | linux-93576e34988757ed431e305ba9d3597e46dffe6b.tar.xz | |
arm64/sme: Ensure that all fields in SMCR_EL1 are set to known values
At present nothing in our CPU initialisation code ever sets unknown fields
in SMCR_EL1 to known values, all updates to SMCR_EL1 are read/modify/write
sequences. All the unknown fields are RES0, explicitly initialise them as
such to avoid future surprises.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240213-arm64-fp-init-vec-cr-v1-2-7e7c2d584f26@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index cc3c9ad877a8..f96907b813fa 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1247,6 +1247,9 @@ void cpu_enable_sme(const struct arm64_cpu_capabilities *__always_unused p) write_sysreg(read_sysreg(CPACR_EL1) | CPACR_EL1_SMEN_EL1EN, CPACR_EL1); isb(); + /* Ensure all bits in SMCR are set to known values */ + write_sysreg_s(0, SYS_SMCR_EL1); + /* Allow EL0 to access TPIDR2 */ write_sysreg(read_sysreg(SCTLR_EL1) | SCTLR_ELx_ENTP2, SCTLR_EL1); isb(); |