arm64: Rename ARM64_WORKAROUND_2966298

BugLink: https://bugs.launchpad.net/bugs/2059068

commit 546b7cd upstream.

In preparation to apply ARM64_WORKAROUND_2966298 for multiple errata,
rename the kconfig and capability. No functional change.

Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20240110-arm-errata-a510-v1-1-d02bc51aeeee@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: robherring

arch/arm64/Kconfig

@@ -1038,8 +1038,12 @@ config ARM64_ERRATUM_2645198
 
 	  If unsure, say Y.
 
+config ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
+	bool
+
 config ARM64_ERRATUM_2966298
 	bool "Cortex-A520: 2966298: workaround for speculatively executed unprivileged load"
+	select ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
 	default y
 	help
 	  This option adds the workaround for ARM Cortex-A520 erratum 2966298.

arch/arm64/kernel/cpu_errata.c

@@ -730,10 +730,10 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 		.cpu_enable = cpu_clear_bf16_from_user_emulation,
 	},
 #endif
-#ifdef CONFIG_ARM64_ERRATUM_2966298
+#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
 	{
 		.desc = "ARM erratum 2966298",
-		.capability = ARM64_WORKAROUND_2966298,
+		.capability = ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD,
 		/* Cortex-A520 r0p0 - r0p1 */
 		ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A520, 0, 0, 1),
 	},

arch/arm64/kernel/entry.S

@@ -428,7 +428,7 @@ alternative_else_nop_endif
 	ldp	x28, x29, [sp, #16 * 14]
 
 	.if	\el == 0
-alternative_if ARM64_WORKAROUND_2966298
+alternative_if ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
 	tlbi	vale1, xzr
 	dsb	nsh
 alternative_else_nop_endif

arch/arm64/tools/cpucaps

@@ -83,7 +83,6 @@ WORKAROUND_2077057
 WORKAROUND_2457168
 WORKAROUND_2645198
 WORKAROUND_2658417
-WORKAROUND_2966298
 WORKAROUND_AMPERE_AC03_CPU_38
 WORKAROUND_TRBE_OVERWRITE_FILL_MODE
 WORKAROUND_TSB_FLUSH_FAILURE
@@ -99,3 +98,4 @@ WORKAROUND_NVIDIA_CARMEL_CNP
 WORKAROUND_QCOM_FALKOR_E1003
 WORKAROUND_REPEAT_TLBI
 WORKAROUND_SPECULATIVE_AT
+WORKAROUND_SPECULATIVE_UNPRIV_LOAD