Messages in this thread Patch in this message | | | Date | Tue, 1 Nov 2011 17:19:39 +0800 | From | Dave Young <> | Subject | [PATCH retry] intel-iommu:make identity_map default for crash dump |
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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
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