linux-kernel - Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR

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 for Android: free password hash cracker in your pocket

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

Date:	Thu, 26 Jan 2012 12:25:32 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Sethi Varun-B16395 <B16395@...escale.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Tony Lindgren <tony@...mide.com>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Wood Scott-B07421 <B07421@...escale.com>,
	David Brown <davidb@...eaurora.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

On 01/20/2012 10:03 AM, Joerg Roedel wrote:
> On Thu, Jan 19, 2012 at 05:16:48PM +0000, Sethi Varun-B16395 wrote:
>>>  struct iommu_domain {
>>>  	struct iommu_ops *ops;
>>>  	void *priv;
>>>  	iommu_fault_handler_t handler;
>>> +	struct iommu_domain_geometry geometry;
>>>  };
>> In case of our iommu implementation the iommu_domain_geometry would
>> include additional attributes. Why can't we let the geometry be
>> Implementation dependent?
> 
> Because the values in this generic geometry-struct make sense for more
> than one IOMMU (short-term for Tegra GART and Freescale PAMU). If you
> have additional vendor-specific ones you could add them via a
> vendor-specific attribute.

Freescale PAMU is the IOMMU that Varun is talking about, that needs
additional geometry attributes (in particular, subwindow count).

How should a PAMU driver interpret "force_aperture"?  When would DMA
ever be allowed outside the specified range?  What does the range mean
in that case?

-Scott

--
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/