arm64/sve: Remove SMCR pseudo register from cpufeature code

For reasons that are not currently apparent during cpufeature enumeration
we maintain a pseudo register for SMCR which records the maximum supported
vector length using the value that would be written to SMCR_EL1.LEN to
configure it. This is not exposed to userspace and is not sufficient for
detecting unsupportable configurations, we need the more detailed checks in
vec_update_vq_map() for that since we can't cope with missing vector
lengths on late CPUs and KVM requires an exactly matching set of supported
vector lengths as EL1 can enumerate VLs directly with the hardware.

Remove the code, replacing the usage in sme_setup() with a query of the
vq_map.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230913-arm64-vec-len-cpufeature-v1-2-cc69b0600a8a@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
index f85650dc561c..f3034099fd95 100644
--- a/arch/arm64/include/asm/cpu.h
+++ b/arch/arm64/include/asm/cpu.h
@@ -63,9 +63,6 @@ struct cpuinfo_arm64 {
 	u64		reg_id_aa64smfr0;
 
 	struct cpuinfo_32bit	aarch32;
-
-	/* pseudo-SMCR for recording maximum SMCR_EL1 LEN value: */
-	u64		reg_smcr;
 };
 
 DECLARE_PER_CPU(struct cpuinfo_arm64, cpu_data);