From abef0695f9665c3dbe9473f964c4da3c1f7c5d3f Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 13 Sep 2023 15:48:12 +0100 Subject: arm64/sve: Remove ZCR pseudo register from cpufeature code For reasons that are not currently apparent during cpufeature enumeration we maintain a pseudo register for ZCR which records the maximum supported vector length using the value that would be written to ZCR_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 sve_setup() with a query of the vq_map. Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230913-arm64-vec-len-cpufeature-v1-1-cc69b0600a8a@kernel.org Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/fpsimd.h | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm64/include/asm/fpsimd.h') diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 8df46f186c64..9e5d3a0812b6 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -128,7 +128,6 @@ extern void sme_kernel_enable(const struct arm64_cpu_capabilities *__unused); extern void sme2_kernel_enable(const struct arm64_cpu_capabilities *__unused); extern void fa64_kernel_enable(const struct arm64_cpu_capabilities *__unused); -extern u64 read_zcr_features(void); extern u64 read_smcr_features(void); /* -- cgit v1.2.3