linux-kernel - Re: [PATCH] iommu/amd: Assign default IOMMU when there is only one IOMMU

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: <20151214150805.GE11292@8bytes.org>
Date:	Mon, 14 Dec 2015 16:08:05 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] iommu/amd: Assign default IOMMU when there is only one
 IOMMU

On Fri, Dec 11, 2015 at 04:54:38PM -0600, Suravee Suthikulpanit wrote:
> Current driver makes assumption that device with devid zero is always
> included in the range of devices to be managed by IOMMU. However,
> certain FW does not include devid zero in IVRS table.
> This has caused IOMMU perf driver to fail to initialize.

Hmm, this is a firmware bug. Is this bug seen in any systems that are
for sale?

> This patch implements a workaround for this case by always assign
> devid zero to be handled by the first IOMMU.

Otherwise its better to fix the firmware than to add workarounds.


	Joerg

--
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/