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emacs 28.2 From: Alistair Popple To: SeongJae Park Cc: akpm@linux-foundation.org, ajd@linux.ibm.com, catalin.marinas@arm.com, fbarrat@linux.ibm.com, iommu@lists.linux.dev, jgg@ziepe.ca, jhubbard@nvidia.com, kevin.tian@intel.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, nicolinc@nvidia.com, npiggin@gmail.com, robin.murphy@arm.com, seanjc@google.com, will@kernel.org, x86@kernel.org, zhi.wang.linux@gmail.com Subject: Re: [PATCH v2 3/5] mmu_notifiers: Call invalidate_range() when invalidating TLBs Date: Thu, 20 Jul 2023 10:52:59 +1000 In-reply-to: <20230719225105.1934-1-sj@kernel.org> Message-ID: <877cqvl7vr.fsf@nvdebian.thelocal> Content-Type: text/plain X-ClientProxiedBy: SYYP282CA0005.AUSP282.PROD.OUTLOOK.COM (2603:10c6:10:b4::15) To DM6PR12MB3179.namprd12.prod.outlook.com (2603:10b6:5:183::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR12MB3179:EE_|DM4PR12MB6591:EE_ X-MS-Office365-Filtering-Correlation-Id: eaf73474-776a-4d34-3e32-08db88bbeebd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Currently it is called from separate >> code paths to the main CPU TLB invalidations. This can lead to a >> secondary TLB not getting invalidated when required and makes it hard >> to reason about when exactly the secondary TLB is invalidated. >> >> To fix this move the notifier call to the architecture specific TLB >> maintenance functions for architectures that have secondary MMUs >> requiring explicit software invalidations. >> >> This fixes a SMMU bug on ARM64. On ARM64 PTE permission upgrades >> require a TLB invalidation. This invalidation is done by the >> architecutre specific ptep_set_access_flags() which calls >> flush_tlb_page() if required. However this doesn't call the notifier >> resulting in infinite faults being generated by devices using the SMMU >> if it has previously cached a read-only PTE in it's TLB. >> >> Moving the invalidations into the TLB invalidation functions ensures >> all invalidations happen at the same time as the CPU invalidation. The >> architecture specific flush_tlb_all() routines do not call the >> notifier as none of the IOMMUs require this. >> >> Signed-off-by: Alistair Popple >> Suggested-by: Jason Gunthorpe > > I found below kernel NULL-dereference issue on latest mm-unstable tree, and > bisect points me to the commit of this patch, namely > 75c400f82d347af1307010a3e06f3aa5d831d995. > > To reproduce, I use 'stress-ng --bigheap $(nproc)'. The issue happens as soon > as it starts reclaiming memory. I didn't dive deep into this yet, but > reporting this issue first, since you might have an idea already. Thanks for the report SJ! I see the problem - current->mm can (obviously!) be NULL which is what's leading to the NULL dereference. Instead I think on x86 I need to call the notifier when adding the invalidate to the tlbbatch in arch_tlbbatch_add_pending() which is equivalent to what ARM64 does. The below should fix it. Will do a respin with this. --- diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 837e4a50281a..79c46da919b9 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -4,6 +4,7 @@ #include #include +#include #include #include @@ -282,6 +283,7 @@ static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *b { inc_mm_tlb_gen(mm); cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm)); + mmu_notifier_arch_invalidate_secondary_tlbs(mm, 0, -1UL); } static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 0b990fb56b66..2d253919b3e8 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1265,7 +1265,6 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch) put_flush_tlb_info(); put_cpu(); - mmu_notifier_arch_invalidate_secondary_tlbs(current->mm, 0, -1UL); } /*