tree 0b997b9cbf701b0dd8814176e33254227cd6746f
parent 2e91bfe2a83d32321171e17cdaa38b8cbe503f7c
author Lu Baolu <baolu.lu@linux.intel.com> 1553047113 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1555744070 +0200

iommu/vt-d: Check capability before disabling protected memory

[ Upstream commit 5bb71fc790a88d063507dc5d445ab8b14e845591 ]

The spec states in 10.4.16 that the Protected Memory Enable
Register should be treated as read-only for implementations
not supporting protected memory regions (PLMR and PHMR fields
reported as Clear in the Capability register).

Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: mark gross <mgross@intel.com>
Suggested-by: Ashok Raj <ashok.raj@intel.com>
Fixes: f8bab73515ca5 ("intel-iommu: PMEN support")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>