linux-kernel - Re: IOMMU keeping mapping over long period of time

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: <m2ehyaz42p.fsf@firstfloor.org>
Date:	Tue, 18 Oct 2011 08:56:14 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Jerome Glisse <j.glisse@...il.com>
Cc:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: IOMMU keeping mapping over long period of time

Jerome Glisse <j.glisse@...il.com> writes:
>
> GPU for which we are interested have dma mask of 40bits at least, thus
> they can work with high mem page. My main concern is when an iommu is
> active, such amount of continuously mapped page might exhaust the iommu
> address space. My understanding is that Intel & AMD iommu are capable of
> growing their address space but is it somethings we can rely on ?

I don't think relying on this is very wise. Better add some way to unmap
when space is running short.

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/