Andi Kleen wrote:
Jesse Barnes (cc:d) wrote a patch to address this, I think (x86: trim
memory not covered by WB MTRRs), but as far as I can tell it hasn't
been merged yet. System is Intel, 4gb of RAM.
It wasn't merged because it broke booting on some systems.
Besides the memory would be still lost -- all it did was to automate
the "mem=XXXX" line.
There really are only two ways to deal with this -- drop the memory
(which should be automated, and a warning printed) or adjust the MTRRs.
The problem is that at some point we run out of MTRRs, partially
because they're masks instead of base/limit.
Even use of PAT doesn't trivially resolve this issue with less than
doing MTRR emulation via PAT (setting the default MTRR to WB); however,
that is bound to cause trouble with SMM.
-hpa
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