6.10-stable review patch. If anyone has any objections, please let me know.
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From: Shivaprasad G Bhat sbhat@linux.ibm.com
[ Upstream commit 4ba2fdff2eb174114786784926d0efb6903c88a6 ]
The PAPR expects the TCE table to have no entries at the time of unset window(i.e. remove-pe). The TCE clear right now is done before freeing the iommu table. On pSeries, the unset window makes those entries inaccessible to the OS and the H_PUT/GET calls fail on them with H_CONSTRAINED.
On PowerNV, this has no side effect as the TCE clear can be done before the DMA window removal as well.
Signed-off-by: Shivaprasad G Bhat sbhat@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/171923273535.1397.1236742071894414895.stgit@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/vfio/vfio_iommu_spapr_tce.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index a94ec6225d31..5f9e7e477078 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -364,7 +364,6 @@ static void tce_iommu_release(void *iommu_data) if (!tbl) continue;
- tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); tce_iommu_free_table(container, tbl); }
@@ -720,6 +719,8 @@ static long tce_iommu_remove_window(struct tce_container *container,
BUG_ON(!tbl->it_size);
+ tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); + /* Detach groups from IOMMUs */ list_for_each_entry(tcegrp, &container->group_list, next) { table_group = iommu_group_get_iommudata(tcegrp->grp); @@ -738,7 +739,6 @@ static long tce_iommu_remove_window(struct tce_container *container, }
/* Free table */ - tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); tce_iommu_free_table(container, tbl); container->tables[num] = NULL;
@@ -1197,9 +1197,14 @@ static void tce_iommu_release_ownership(struct tce_container *container, return; }
- for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) - if (container->tables[i]) + for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { + if (container->tables[i]) { + tce_iommu_clear(container, container->tables[i], + container->tables[i]->it_offset, + container->tables[i]->it_size); table_group->ops->unset_window(table_group, i); + } + } }
static long tce_iommu_take_ownership(struct tce_container *container,