diff options
Diffstat (limited to 'arch/arm64/mm')
| -rw-r--r-- | arch/arm64/mm/context.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c index 21f9f1ea14f7..6b5783f6eb0e 100644 --- a/arch/arm64/mm/context.c +++ b/arch/arm64/mm/context.c @@ -24,6 +24,7 @@ #include <asm/cpufeature.h> #include <asm/mmu_context.h> +#include <asm/smp.h> #include <asm/tlbflush.h> static u32 asid_bits; @@ -62,6 +63,23 @@ static u32 get_cpu_asid_bits(void) return asid; } +/* Check if the current cpu's ASIDBits is compatible with asid_bits */ +void verify_cpu_asid_bits(void) +{ + u32 asid = get_cpu_asid_bits(); + + if (asid < asid_bits) { + /* + * We cannot decrease the ASID size at runtime, so panic if we support + * fewer ASID bits than the boot CPU. + */ + pr_crit("CPU%d: smaller ASID size(%u) than boot CPU (%u)\n", + smp_processor_id(), asid, asid_bits); + update_cpu_boot_status(CPU_PANIC_KERNEL); + cpu_park_loop(); + } +} + static void flush_context(unsigned int cpu) { int i; |