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

commit a5951389e58d2e816eed3dbec5877de9327fd881 upstream.

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: 558c303c9734 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index bf8b26bb223d8ef65d306c6e04c8300bbcd837ca..750588f9a1d4862685a887f1a0ed6c9c239345cf 100644 (file)
--- a/arch/arm64/kernel/proton-pack.c
+++ b/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),
@@ -889,6 +897,7 @@ 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),
@@ -904,7 +913,11 @@ 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;