From: Alexander Graf <agraf@suse.de>
Date: Sun, 15 Aug 2010 06:04:24 +0000 (+0200)
Subject: KVM: PPC: Implement correct SID mapping on Book3s_32
X-Git-Tag: v2.6.37-rc1~142^2~89
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b6db3bc965c204db6868d4005808b4fdc9c46d7;p=pandora-kernel.git

KVM: PPC: Implement correct SID mapping on Book3s_32

Up until now we were doing segment mappings wrong on Book3s_32. For Book3s_64
we were using a trick where we know that a single mmu_context gives us 16 bits
of context ids.

The mm system on Book3s_32 instead uses a clever algorithm to distribute VSIDs
across the available range, so a context id really only gives us 16 available
VSIDs.

To keep at least a few guest processes in the SID shadow, let's map a number of
contexts that we can use as VSID pool. This makes the code be actually correct
and shouldn't hurt performance too much.

Signed-off-by: Alexander Graf <agraf@suse.de>
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