linux-kernel - Re: [PATCH v5 5/7] iommu/dma: Allow a single FQ in addition to per-CPU FQs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Y9ficPosWtGqbDit@nvidia.com>
Date:   Mon, 30 Jan 2023 11:29:52 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>, iommu@...ts.linux.dev,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org,
        Julian Ruess <julianr@...ux.ibm.com>
Subject: Re: [PATCH v5 5/7] iommu/dma: Allow a single FQ in addition to
 per-CPU FQs

On Mon, Jan 30, 2023 at 03:13:22PM +0000, Robin Murphy wrote:

> Either way, the more I think about this the more I'm starting to agree that
> adding more domain types for iommu-dma policy is a step in the wrong
> direction. If I may, I'd like to fall back on the "or at least some definite
> internal flag" part of my original suggestion :)

Yes please, lets try to remove IOMMU_DOMAIN_DMA, not add more :)

At this point we should probably just sort of hackily add a ops flag
to indicate single queue and when we fixup the policy logic we can
make it a user selectable policy as well.

Jason