linux-kernel - [PATCH] intel-iommu:make identity

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Message-ID: <20111021123154.GA5821@darkstar.nay.redhat.com>
Date:	Fri, 21 Oct 2011 20:31:54 +0800
From:	Dave Young <dyoung@...hat.com>
To:	kexec@...ts.infradead.org, iommu@...ts.linux-foundation.org,
	vgoyal@...hat.com, linux-kernel@...r.kernel.org, luyu@...hat.com
Subject: [PATCH] intel-iommu:make identity_map default for crash dump

kdump kernel sometimes will get DMAR faults which
is caused by random in-flight dma from 1st kernel

Here make the identity_mapping as default for this case

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 drivers/iommu/intel-iommu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c621c98..8ac3895 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -40,6 +40,7 @@
 #include <linux/tboot.h>
 #include <linux/dmi.h>
 #include <linux/pci-ats.h>
+#include <linux/crash_dump.h>
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
 
@@ -2481,7 +2482,7 @@ static int __init init_dmars(void)
 		}
 	}
 
-	if (iommu_pass_through)
+	if (iommu_pass_through || is_kdump_kernel())
 		iommu_identity_mapping |= IDENTMAP_ALL;
 
 #ifdef CONFIG_DMAR_BROKEN_GFX_WA
-- 
1.7.4.4

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