arm64: errata: Add newer ARM cores to the spectre_bhb_loop_affected() lists

JIRA: https://issues.redhat.com/browse/RHEL-119900

commit a595138
Author: Douglas Anderson <dianders@chromium.org>
Date:   Tue, 7 Jan 2025 12:06:02 -0800

    arm64: errata: Add newer ARM cores to the spectre_bhb_loop_affected() lists

    When comparing to the ARM list [1], it appears that several ARM cores
    were missing from the lists in spectre_bhb_loop_affected(). Add them.

    NOTE: for some of these cores it may not matter since other ways of
    clearing the BHB may be used (like the CLRBHB instruction or ECBHB),
    but it still seems good to have all the info from ARM's whitepaper
    included.

    [1] https://developer.arm.com/Arm%20Security%20Center/Spectre-BHB

    Fixes: 558c303 ("arm64: Mitigate spectre style branch history side channels")
    Cc: stable@vger.kernel.org
    Signed-off-by: Douglas Anderson <dianders@chromium.org>
    Reviewed-by: James Morse <james.morse@arm.com>
    Link: https://lore.kernel.org/r/20250107120555.v4.5.I4a9a527e03f663040721c5401c41de587d015c82@changeid
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Signed-off-by: Waiman Long <longman@redhat.com>

Author: Waiman-Long

arch/arm64/kernel/proton-pack.c

@@ -876,6 +876,14 @@ static u8 spectre_bhb_loop_affected(void)
 {
 	u8 k = 0;
 
+	static const struct midr_range spectre_bhb_k132_list[] = {
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_X3),
+		MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V2),
+	};
+	static const struct midr_range spectre_bhb_k38_list[] = {
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A715),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A720),
+	};
 	static const struct midr_range spectre_bhb_k32_list[] = {
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A78),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A78AE),
@@ -890,6 +898,7 @@ static u8 spectre_bhb_loop_affected(void)
 	};
 	static const struct midr_range spectre_bhb_k24_list[] = {
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A76),
+		MIDR_ALL_VERSIONS(MIDR_CORTEX_A76AE),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A77),
 		MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
 		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_GOLD),
@@ -905,7 +914,11 @@ static u8 spectre_bhb_loop_affected(void)
 		{},
 	};
 
-	if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k32_list))
+	if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k132_list))
+		k = 132;
+	else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k38_list))
+		k = 38;
+	else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k32_list))
 		k = 32;
 	else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k24_list))
 		k = 24;