This is a note to let you know that I've just added the patch titled
iommu/io-pgtable-arm: Fix table descriptor paddr formatting
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-io-pgtable-arm-fix-table-descriptor-paddr-form.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c1b545974bba6e4d641b56961824d8c7574aaf01
Author: Hector Martin <marcan@xxxxxxxxx>
Date: Sat Nov 20 12:13:43 2021 +0900
iommu/io-pgtable-arm: Fix table descriptor paddr formatting
[ Upstream commit 9abe2ac834851a7d0b0756e295cf7a292c45ca53 ]
Table descriptors were being installed without properly formatting the
address using paddr_to_iopte, which does not match up with the
iopte_deref in __arm_lpae_map. This is incorrect for the LPAE pte
format, as it does not handle the high bits properly.
This was found on Apple T6000 DARTs, which require a new pte format
(different shift); adding support for that to
paddr_to_iopte/iopte_to_paddr caused it to break badly, as even <48-bit
addresses would end up incorrect in that case.
Fixes: 6c89928ff7a0 ("iommu/io-pgtable-arm: Support 52-bit physical address")
Acked-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211120031343.88034-1-marcan@xxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index dd9e47189d0d9..94ff319ae8acc 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -315,11 +315,12 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
arm_lpae_iopte *ptep,
arm_lpae_iopte curr,
- struct io_pgtable_cfg *cfg)
+ struct arm_lpae_io_pgtable *data)
{
arm_lpae_iopte old, new;
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
- new = __pa(table) | ARM_LPAE_PTE_TYPE_TABLE;
+ new = paddr_to_iopte(__pa(table), data) | ARM_LPAE_PTE_TYPE_TABLE;
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
new |= ARM_LPAE_PTE_NSTABLE;
@@ -380,7 +381,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
if (!cptep)
return -ENOMEM;
- pte = arm_lpae_install_table(cptep, ptep, 0, cfg);
+ pte = arm_lpae_install_table(cptep, ptep, 0, data);
if (pte)
__arm_lpae_free_pages(cptep, tblsz, cfg);
} else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
@@ -592,7 +593,7 @@ static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
__arm_lpae_init_pte(data, blk_paddr, pte, lvl, 1, &tablep[i]);
}
- pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg);
+ pte = arm_lpae_install_table(tablep, ptep, blk_pte, data);
if (pte != blk_pte) {
__arm_lpae_free_pages(tablep, tablesz, cfg);
/*
