5.15-stable review patch. If anyone has any objections, please let me know.
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From: Douglas Anderson dianders@chromium.org
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.I4a9a527e03f663040721c5401c41d... Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/kernel/proton-pack.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
--- 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;