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| author | Joerg Roedel <jroedel@suse.de> | 2015-10-20 14:59:36 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2015-10-21 11:29:06 +0200 |
| commit | cbf3ccd09d683abf1cacd36e3640872ee912d99b (patch) | |
| tree | 3fbda4ca1a94e2bc939d644246c3525606b96652 /drivers/iommu/amd_iommu.c | |
| parent | iommu/amd: Fix BUG when faulting a PROT_NONE VMA (diff) | |
| download | linux-cbf3ccd09d683abf1cacd36e3640872ee912d99b.tar.xz linux-cbf3ccd09d683abf1cacd36e3640872ee912d99b.zip | |
iommu/amd: Don't clear DTE flags when modifying it
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: G. Richard Bellamy <rbellamy@pteradigm.com>
Tested-by: G. Richard Bellamy <rbellamy@pteradigm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 08d2775887f7..532e2a211fe1 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -1974,8 +1974,8 @@ static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats) 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[0] = IOMMU_PTE_P | IOMMU_PTE_TV; + amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK; amd_iommu_apply_erratum_63(devid); } |