Messages in this thread | | | Subject | Re: [PATCH] Linux VM workaround for Knights Landing A/D leak | From | Nadav Amit <> | Date | Tue, 14 Jun 2016 09:47:41 -0700 |
| |
Lukasz Anaczkowski <lukasz.anaczkowski@intel.com> wrote:
> From: Andi Kleen <ak@linux.intel.com> > +void fix_pte_leak(struct mm_struct *mm, unsigned long addr, pte_t *ptep) > +{ Here there should be a call to smp_mb__after_atomic() to synchronize with switch_mm. I submitted a similar patch, which is still pending (hint).
> + if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids) { > + trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL); > + flush_tlb_others(mm_cpumask(mm), mm, addr, > + addr + PAGE_SIZE); > + mb(); > + set_pte(ptep, __pte(0)); > + } > +}
Regards, Nadav
| |