linux-kernel - Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

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: <CAKHBV27FbpJHoPC5_8mCYHmhEbCaCE7st_-qzPv0uQYSH3RC9g@mail.gmail.com>
Date:   Fri, 21 Jul 2023 14:48:23 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, jean-philippe@...aro.org,
        jgg@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

> And since we have a group of subdomains that are simply indexed
> by ssids, perhaps we can add an xarray to store a subdomain ptr
> along with an ssid, replacing the list?

Hmmmm, I think the only place where we search through the list for a
specific SSID is during remove_dev_pasid. We mostly use the list to
iterate over  all the masters/ssids that this domain is attached to.
I'm not sure if moving to an xarray to optimize the remove_dev_pasid
call is worth it (at the cost of iterations which IIUC would become N
log(N))