From: Dave Young <dyoung@redhat.com>
To: kexec@lists.infradead.org, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Cc: vgoyal@redhat.com, horms@verge.net.au, luyu@redhat.com,
dwmw2@infradead.org
Subject: [PATCH retry] intel-iommu:make identity_map default for crash dump
Date: Tue, 1 Nov 2011 17:19:39 +0800 [thread overview]
Message-ID: <20111101091939.GA8985@darkstar.nay.redhat.com> (raw)
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@redhat.com>
---
drivers/iommu/intel-iommu.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
--- linux-2.6.orig/drivers/iommu/intel-iommu.c 2011-11-01 13:06:18.667505962 +0800
+++ linux-2.6/drivers/iommu/intel-iommu.c 2011-11-01 17:07:50.789137864 +0800
@@ -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>
@@ -2488,7 +2489,7 @@ static int __init init_dmars(void)
}
}
- if (iommu_pass_through)
+ if (iommu_pass_through || is_kdump_kernel())
iommu_identity_mapping |= IDENTMAP_ALL;
#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
next reply other threads:[~2011-11-01 9:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-01 9:19 Dave Young [this message]
2011-11-01 9:34 ` David Woodhouse
2011-11-01 9:52 ` Dave Young
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