diff options
Diffstat (limited to 'arch/powerpc/mm/book3s64/radix_tlb.c')
-rw-r--r-- | arch/powerpc/mm/book3s64/radix_tlb.c | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c index 409e61210789..312236a6b085 100644 --- a/arch/powerpc/mm/book3s64/radix_tlb.c +++ b/arch/powerpc/mm/book3s64/radix_tlb.c @@ -1336,49 +1336,3 @@ void radix__flush_tlb_all(void) : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(0) : "memory"); asm volatile("eieio; tlbsync; ptesync": : :"memory"); } - -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE -extern void radix_kvm_prefetch_workaround(struct mm_struct *mm) -{ - unsigned long pid = mm->context.id; - - if (unlikely(pid == MMU_NO_CONTEXT)) - return; - - if (!cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) - return; - - /* - * If this context hasn't run on that CPU before and KVM is - * around, there's a slim chance that the guest on another - * CPU just brought in obsolete translation into the TLB of - * this CPU due to a bad prefetch using the guest PID on - * the way into the hypervisor. - * - * We work around this here. If KVM is possible, we check if - * any sibling thread is in KVM. If it is, the window may exist - * and thus we flush that PID from the core. - * - * A potential future improvement would be to mark which PIDs - * have never been used on the system and avoid it if the PID - * is new and the process has no other cpumask bit set. - */ - if (cpu_has_feature(CPU_FTR_HVMODE) && radix_enabled()) { - int cpu = smp_processor_id(); - int sib = cpu_first_thread_sibling(cpu); - bool flush = false; - - for (; sib <= cpu_last_thread_sibling(cpu) && !flush; sib++) { - if (sib == cpu) - continue; - if (!cpu_possible(sib)) - continue; - if (paca_ptrs[sib]->kvm_hstate.kvm_vcpu) - flush = true; - } - if (flush) - _tlbiel_pid(pid, RIC_FLUSH_ALL); - } -} -EXPORT_SYMBOL_GPL(radix_kvm_prefetch_workaround); -#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ |