diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/proc-v7-bugs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c index 85a2e3d6263c..027b29f852f6 100644 --- a/arch/arm/mm/proc-v7-bugs.c +++ b/arch/arm/mm/proc-v7-bugs.c @@ -4,11 +4,15 @@ #include <asm/cp15.h> #include <asm/cputype.h> +#include <asm/proc-fns.h> #include <asm/system_misc.h> #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR DEFINE_PER_CPU(harden_branch_predictor_fn_t, harden_branch_predictor_fn); +extern void cpu_v7_iciallu_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm); +extern void cpu_v7_bpiall_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm); + static void harden_branch_predictor_bpiall(void) { write_sysreg(0, BPIALL); @@ -34,6 +38,8 @@ static void cpu_v7_spectre_init(void) case ARM_CPU_PART_CORTEX_A17: case ARM_CPU_PART_CORTEX_A73: case ARM_CPU_PART_CORTEX_A75: + if (processor.switch_mm != cpu_v7_bpiall_switch_mm) + goto bl_error; per_cpu(harden_branch_predictor_fn, cpu) = harden_branch_predictor_bpiall; spectre_v2_method = "BPIALL"; @@ -41,6 +47,8 @@ static void cpu_v7_spectre_init(void) case ARM_CPU_PART_CORTEX_A15: case ARM_CPU_PART_BRAHMA_B15: + if (processor.switch_mm != cpu_v7_iciallu_switch_mm) + goto bl_error; per_cpu(harden_branch_predictor_fn, cpu) = harden_branch_predictor_iciallu; spectre_v2_method = "ICIALLU"; @@ -49,6 +57,11 @@ static void cpu_v7_spectre_init(void) if (spectre_v2_method) pr_info("CPU%u: Spectre v2: using %s workaround\n", smp_processor_id(), spectre_v2_method); + return; + +bl_error: + pr_err("CPU%u: Spectre v2: incorrect context switching function, system vulnerable\n", + cpu); } #else static void cpu_v7_spectre_init(void) |