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Date: Wed, 16 Dec 2020 12:10:22 +0000 From: Robin Murphy <robin.murphy@....com> To: Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org> Cc: youlin.pei@...iatek.com, anan.sun@...iatek.com, Nicolas Boichat <drinkcat@...omium.org>, srv_heupstream@...iatek.com, chao.hao@...iatek.com, linux-kernel@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>, Tomasz Figa <tfiga@...gle.com>, iommu@...ts.linux-foundation.org, linux-mediatek@...ts.infradead.org, Matthias Brugger <matthias.bgg@...il.com>, Greg Kroah-Hartman <gregkh@...gle.com>, kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH v3 4/7] iommu: Switch gather->end to unsigned long long On 2020-12-16 10:36, Yong Wu wrote: > Currently gather->end is "unsigned long" which may be overflow in > arch32 in the corner case: 0xfff00000 + 0x100000(iova + size). > Although it doesn't affect the size(end - start), it affects the checking > "gather->end < end" This won't help the same situation at the top of a 64-bit address space, though, and now that we have TTBR1 support for AArch64 format that is definitely a thing. Better to just encode the end address as the actual end address, i.e. iova + size - 1. We don't lose anything other than the ability to encode zero-sized invalidations that don't make sense anyway. Robin. > Fixes: a7d20dc19d9e ("iommu: Introduce struct iommu_iotlb_gather for batching TLB flushes") > Signed-off-by: Yong Wu <yong.wu@...iatek.com> > --- > include/linux/iommu.h | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 794d4085edd3..6e907a95d981 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -178,7 +178,7 @@ enum iommu_dev_features { > */ > struct iommu_iotlb_gather { > unsigned long start; > - unsigned long end; > + unsigned long long end; > size_t pgsize; > }; > > @@ -537,7 +537,8 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain, > struct iommu_iotlb_gather *gather, > unsigned long iova, size_t size) > { > - unsigned long start = iova, end = start + size; > + unsigned long start = iova; > + unsigned long long end = start + size; > > /* > * If the new page is disjoint from the current range or is mapped at >
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