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    SubjectRe: [patch 01/22] AMD IOMMU: enable device isolation per default
    On Tue 2008-12-16 16:03:53, Greg KH wrote:
    > 2.6.27-stable review patch. If anyone has any objections, please let us know.
    >
    > ------------------
    >
    > From: Joerg Roedel <joerg.roedel@amd.com>
    >
    > commit 3ce1f93c6d53c3f91c3846cf66b018276c8ac2e7 upstream.
    >
    > Impact: makes device isolation the default for AMD IOMMU
    >
    > Some device drivers showed double-free bugs of DMA memory while testing
    > them with AMD IOMMU. If all devices share the same protection domain
    > this can lead to data corruption and data loss. Prevent this by putting
    > each device into its own protection domain per default.
    >
    > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    > Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    This does not look like 'fix for a serious bug' to
    me. stable_kernel_rules.txt says '...not a "this could be a problem"
    type thing'.

    Yes, maybe iommu is mature enough that we want it enabled, but...

    (Or maybe Documentation/stable_kernel_rules.txt needs updating. The
    patch for penguin dirty feet already got in.....)
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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