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arm64: Add AMPERE1 to the Spectre-BHB affected list

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Per AmpereOne erratum AC03_CPU_12, "Branch history may allow control of
speculative execution across software contexts," the AMPERE1 core needs the
bhb clearing loop to mitigate Spectre-BHB, with a loop iteration count of
11.

Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20221011022140.432370-1-scott@os.amperecomputing.com
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
D Scott Phillips 2022-10-10 19:21:40 -07:00 committed by Catalin Marinas
parent a8e5e5146a
commit 0e5d5ae837
2 changed files with 10 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/arm64/include/asm/cputype.h
View file

@ -60,6 +60,7 @@
#define ARM_CPU_IMP_FUJITSU 0x46
#define ARM_CPU_IMP_HISI 0x48
#define ARM_CPU_IMP_APPLE 0x61
#define ARM_CPU_IMP_AMPERE 0xC0
#define ARM_CPU_PART_AEM_V8 0xD0F
#define ARM_CPU_PART_FOUNDATION 0xD00
@ -123,6 +124,8 @@
#define APPLE_CPU_PART_M1_ICESTORM_MAX 0x028
#define APPLE_CPU_PART_M1_FIRESTORM_MAX 0x029
#define AMPERE_CPU_PART_AMPERE1 0xAC3
#define MIDR_CORTEX_A53 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53)
#define MIDR_CORTEX_A57 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A57)
#define MIDR_CORTEX_A72 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72)
@ -172,6 +175,7 @@
#define MIDR_APPLE_M1_FIRESTORM_PRO MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM_PRO)
#define MIDR_APPLE_M1_ICESTORM_MAX MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM_MAX)
#define MIDR_APPLE_M1_FIRESTORM_MAX MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM_MAX)
#define MIDR_AMPERE1 MIDR_CPU_MODEL(ARM_CPU_IMP_AMPERE, AMPERE_CPU_PART_AMPERE1)
/* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
#define MIDR_FUJITSU_ERRATUM_010001 MIDR_FUJITSU_A64FX

6
arch/arm64/kernel/proton-pack.c
View file

@ -868,6 +868,10 @@ u8 spectre_bhb_loop_affected(int scope)
MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
{},
};
static const struct midr_range spectre_bhb_k11_list[] = {
MIDR_ALL_VERSIONS(MIDR_AMPERE1),
{},
};
static const struct midr_range spectre_bhb_k8_list[] = {
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
@ -878,6 +882,8 @@ u8 spectre_bhb_loop_affected(int scope)
k = 32;
else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k24_list))
k = 24;
else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k11_list))
k = 11;
else if (is_midr_in_range_list(read_cpuid_id(), spectre_bhb_k8_list))
k = 8;