linux-kernel - RE: [PATCH v1 2/2] swiotlb: Fix slot alignment checks

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Message-ID: <SA1PR21MB1335CF4B7E9B1EC61B84AA03BF909@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Wed, 5 Apr 2023 06:00:13 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Petr Tesařík <petr@...arici.cz>
CC:     Dexuan-Linux Cui <dexuan.linux@...il.com>,
        Petr Tesarik <petrtesarik@...weicloud.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Jianxiong Gao <jxgao@...gle.com>,
        David Stevens <stevensd@...omium.org>,
        Joerg Roedel <jroedel@...e.de>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>,
        open list <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH v1 2/2] swiotlb: Fix slot alignment checks

> From: Petr Tesařík <petr@...arici.cz>
> Sent: Tuesday, April 4, 2023 10:51 PM
> > ...
> > Argh, you're right. This is a braino. The alignment mask is in fact an
> > INVERTED mask, i.e. it masks off bits that are not relevant for the
> > alignment. The more strict alignment needed the more bits must be set,
> > so the individual alignment constraints must be combined with an OR
> > instead of an AND.
> >
> > Can you apply the following change and check if it fixes the issue?
> 
> Actually, this will not work either. The mask is used to mask off both
It works for me.

> high address bits and low address bits (below swiotlb slot granularity).
> 
> What should help is this:
> ...
This also works for me.

Thanks, *either* version can resolve the issue for me :-)