tree 0c999928e4a3dd0088f5cc2bef0a1d982ad747c3
parent 9dfef5aae422d479d8e561889da05cf31d850d5c
author David Gibson <david@gibson.dropbear.id.au> 1312405339 +0000
committer Alexander Graf <agraf@suse.de> 1317887283 +0200

pseries: More complete WIMG validation in H_ENTER code

Currently our implementation of the H_ENTER hypercall, which inserts a
mapping in the hash page table assumes that only ordinary memory is ever
mapped, and only permits mapping attribute bits accordingly (WIMG==0010).

However, we intend to start adding emulated IO to the pseries platform
(and real IO with PCI passthrough on kvm) which means this simple test
will no longer suffice.

This patch extends the h_enter validation code to check if the given
address is a RAM address.  If it is it enforces WIMG==0010, otherwise
it assumes that it is an IO mapping and instead enforces WIMG=010x.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>