Commit cb296a33 authored by Joerg Roedel's avatar Joerg Roedel Committed by Luis Henriques

iommu/amd: Don't clear DTE flags when modifying it

commit cbf3ccd0 upstream.

During device assignment/deassignment the flags in the DTE
get lost, which might cause spurious faults, for example
when the device tries to access the system management range.
Fix this by not clearing the flags with the rest of the DTE.
Reported-by: default avatarG. Richard Bellamy <rbellamy@pteradigm.com>
Tested-by: default avatarG. Richard Bellamy <rbellamy@pteradigm.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 257a888b
......@@ -2153,7 +2153,7 @@ static void clear_dte_entry(u16 devid)
{
/* remove entry from the device table seen by the hardware */
amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
amd_iommu_dev_table[devid].data[1] = 0;
amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK;
amd_iommu_apply_erratum_63(devid);
}
......
......@@ -289,6 +289,7 @@
#define IOMMU_PTE_IR (1ULL << 61)
#define IOMMU_PTE_IW (1ULL << 62)
#define DTE_FLAG_MASK (0x3ffULL << 32)
#define DTE_FLAG_IOTLB (0x01UL << 32)
#define DTE_FLAG_GV (0x01ULL << 55)
#define DTE_GLX_SHIFT (56)
......
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