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: 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>

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index 89405be53d8fc0cf9d5dfcb746de4a472cc69a70..0f51fd10b4b06327381ac50a606e6d5871b1d426 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;