From: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
To: Alex Williamson
<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
"Khan, Shuah" <shuah.khan-VXdhtT5mjnY@public.gmane.org>,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"Mingarelli,
Thomas" <Thomas.Mingarelli-VXdhtT5mjnY@public.gmane.org>
Subject: Re: [PATCH v2] Intel IOMMU patch to reprocess RMRR info
Date: Fri, 28 Sep 2012 11:43:01 +0200 [thread overview]
Message-ID: <20120928094301.GH10549@amd.com> (raw)
In-Reply-To: <1348781647.2320.264.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
On Thu, Sep 27, 2012 at 03:34:07PM -0600, Alex Williamson wrote:
> It really seems like RMRRs are incompatible with IOMMU API use
> though.
I don't think so. The concept of RMRR is just not defined well enough
(like the concept of unity mappings on the AMD side which is similar to
RMRR). The definition says, that any memory region must be mapped at
any time for the device. But that is not true (at least I have no
counter-example yet). The right definition would be, that the RMRR
regions are only necessary as long as the operating system does not
control the particular device. And assigning a device to a guest also
counts a 'taking control over the device'.
Joerg
next prev parent reply other threads:[~2012-09-28 9:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-18 16:49 [PATCH v2] Intel IOMMU patch to reprocess RMRR info Tom Mingarelli
[not found] ` <20120918164955.12296.28799.sendpatchset-jP8EmR9A9vELnkn81s9yt/egYHeGw8Jk@public.gmane.org>
2012-09-18 17:46 ` Don Dutile
2012-09-27 20:36 ` Alex Williamson
[not found] ` <1348778200.2320.241.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2012-09-27 21:10 ` Mingarelli, Thomas
[not found] ` <9774516974AF5F4C8A2C3C69CD3412332338F452-KNyhpuZufFMSZAcGdq5asR6epYMZPwEe5NbjCUgZEJk@public.gmane.org>
2012-09-27 21:34 ` Alex Williamson
[not found] ` <1348781647.2320.264.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2012-09-27 21:50 ` David Woodhouse
[not found] ` <1348782605.2036.117.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-09-28 9:46 ` Joerg Roedel
[not found] ` <20120928094625.GI10549-5C7GfCeVMHo@public.gmane.org>
2012-09-28 10:23 ` David Woodhouse
[not found] ` <1348827803.2036.121.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-09-28 12:03 ` Joerg Roedel
2012-09-27 21:50 ` Linda Knippers
[not found] ` <5064CA2D.3030206-VXdhtT5mjnY@public.gmane.org>
2012-09-27 21:48 ` Mingarelli, Thomas
2012-09-27 21:52 ` Alex Williamson
2012-09-28 9:43 ` Joerg Roedel [this message]
[not found] ` <20120928094301.GH10549-5C7GfCeVMHo@public.gmane.org>
2012-09-28 12:40 ` Alex Williamson
[not found] ` <1348836008.2320.284.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2012-09-28 12:52 ` Joerg Roedel
[not found] ` <20120928125246.GK10549-5C7GfCeVMHo@public.gmane.org>
2012-09-28 13:21 ` Alex Williamson
-- strict thread matches above, loose matches on Subject: below --
2012-09-18 17:27 Tom Mingarelli
2012-09-28 15:52 David Woodhouse
[not found] ` <uh6q9m8bwu6c2jov69m2aivu.1348847561292-2ueSQiBKiTY7tOexoI0I+QC/G2K4zDHf@public.gmane.org>
2012-09-28 16:30 ` Alex Williamson
2012-09-28 16:36 ` Linda Knippers
[not found] ` <5065D1F5.1090003-VXdhtT5mjnY@public.gmane.org>
2012-09-28 17:01 ` Joerg Roedel
[not found] ` <20120928170106.GE18962-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2012-09-28 17:06 ` Joerg Roedel
2012-09-28 17:28 ` Alex Williamson
2012-09-28 19:15 ` David Woodhouse
[not found] ` <1348859719.2036.128.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-09-28 19:21 ` Mingarelli, Thomas
2012-09-28 19:35 ` Shuah Khan
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