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Commit 54bd6357 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Suppress IO_PAGE_FAULTs in kdump kernel 



When booting into a kdump kernel, suppress IO_PAGE_FAULTs by
default for all devices. But allow the faults again when a
domain is assigned to a device.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ac3b708a

drivers/iommu/amd_iommu.c

+2 −1
Original line number Diff line number Diff line
@@ -2078,7 +2078,8 @@ static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats) 
		flags    |= tmp;

	}



	flags &= ~(0xffffUL);



	flags &= ~(DTE_FLAG_SA | 0xffffULL);

	flags |= domain->id;



	amd_iommu_dev_table[devid].data[1]  = flags;

drivers/iommu/amd_iommu_init.c

+9 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/export.h>

#include <linux/iommu.h>

#include <linux/kmemleak.h>

#include <linux/crash_dump.h>

#include <asm/pci-direct.h>

#include <asm/iommu.h>

#include <asm/gart.h>
@@ -1900,6 +1901,14 @@ static void init_device_table_dma(void) 
	for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {

		set_dev_entry_bit(devid, DEV_ENTRY_VALID);

		set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);

		/*

		 * In kdump kernels in-flight DMA from the old kernel might

		 * cause IO_PAGE_FAULTs. There are no reports that a kdump

		 * actually failed because of that, so just disable fault

		 * reporting in the hardware to get rid of the messages

		 */

		if (is_kdump_kernel())

			set_dev_entry_bit(devid, DEV_ENTRY_NO_PAGE_FAULT);

	}

}

drivers/iommu/amd_iommu_types.h

+1 −0
Original line number Diff line number Diff line
@@ -322,6 +322,7 @@ 
#define IOMMU_PTE_IW (1ULL << 62)



#define DTE_FLAG_IOTLB	(1ULL << 32)

#define DTE_FLAG_SA	(1ULL << 34)

#define DTE_FLAG_GV	(1ULL << 55)

#define DTE_FLAG_MASK	(0x3ffULL << 32)

#define DTE_GLX_SHIFT	(56)