linux-kernel - [PATCH 05/17] iommu/vt-d: Mark root-entry present in set_root

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Message-Id: <1433513463-19128-6-git-send-email-joro@8bytes.org>
Date:	Fri,  5 Jun 2015 16:10:51 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	zhen-hual@...com, bhe@...hat.com, dwmw2@...radead.org,
	vgoyal@...hat.com, dyoung@...hat.com, alex.williamson@...hat.com,
	ddutile@...hat.com, ishii.hironobu@...fujitsu.com,
	indou.takao@...fujitsu.com, bhelgaas@...gle.com, doug.hatch@...com,
	jerry.hoemann@...com, tom.vaden@...com, li.zhang6@...com,
	lisa.mitchell@...com, billsumnerlinux@...il.com, rwright@...com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	kexec@...ts.infradead.org, joro@...tes.org, jroedel@...e.de
Subject: [PATCH 05/17] iommu/vt-d: Mark root-entry present in set_root_entry

From: Joerg Roedel <jroedel@...e.de>

When we do no memcpy from the old to the new kernel for the
root entry table, we have to set the present bit ourself.

Tested-by: Baoquan He <bhe@...hat.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel-iommu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index d66bec6..cda0901 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -198,8 +198,7 @@ static inline bool root_present(struct root_entry *root)
 
 static inline void set_root_value(struct root_entry *root, unsigned long value)
 {
-	root->lo &= ~VTD_PAGE_MASK;
-	root->lo |= value & VTD_PAGE_MASK;
+	root->lo = (value & VTD_PAGE_MASK) | 1;
 }
 
 static inline struct context_entry *
-- 
1.9.1

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