Jeremy Fitzhardinge wrote:
H. Peter Anvin wrote:
While we're mucking around in this area, there is another thing which
we should eventually get around to fixing:
we need a set of page tables with an identity mapping as well as the
kernel mapping, for trampolining (during startup, but also during
things like ACPI suspend/resume.) Right now, we let those be the
swapper page tables, but that's probably not really a good idea, since
it can hide bugs.
So you're suggesting a second system pagetable which has a P=V alias as
well as the normal kernel mapping, used only when we actually need that
alias? Sounds simple enough to arrange.
I just looked at the ACPI suspend code, and it looks like it hacks its
own identity map at runtime. Pavel, am I reading that code right?
-hpa
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