Messages in this thread | | | Date | Thu, 2 Jul 2009 23:30:23 +0200 | From | Pavel Machek <> | Subject | Re: [RFC v6][PATCH 4/4] intel_txt: force IOMMU on for Intel(R) TXT launch |
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On Tue 2009-06-30 19:31:10, Joseph Cihula wrote: > The tboot module will DMA protect all of memory in order to ensure the that > kernel will be able to initialize without compromise (from DMA). Consequently, > the kernel must enable Intel(R) Virtualization Technology for Directed I/O > (VT-d or Intel IOMMU) in order to replace this broad protection with the > appropriate page-granular protection. Otherwise DMA devices will be unable > to read or write from memory and the kernel will eventually panic. > > Because runtime IOMMU support is configurable by command line options, this > patch will force it to be enabled regardless of the options specified, and will > log a message if it was required to force it on. > > > dmar.c | 7 +++++++ > intel-iommu.c | 17 +++++++++++++++-- > 2 files changed, 22 insertions(+), 2 deletions(-) > > Signed-off-by: Joseph Cihula <joseph.cihula@intel.com> > Signed-off-by: Shane Wang <shane.wang@intel.com>
NAK. Breaks user expectations, misses docs updates.
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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