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iommu/io-pgtable-arm: Unmap and free table when overwriting with block

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When installing a block mapping, we unconditionally overwrite a non-leaf
PTE if we find one. However, this can cause a problem if the following
sequence of events occur:

  (1) iommu_map called for a 4k (i.e. PAGE_SIZE) mapping at some address
      - We initialise the page table all the way down to a leaf entry
      - No TLB maintenance is required, because we're going from invalid
        to valid.

  (2) iommu_unmap is called on the mapping installed in (1)
      - We walk the page table to the final (leaf) entry and zero it
      - We only changed a valid leaf entry, so we invalidate leaf-only

  (3) iommu_map is called on the same address as (1), but this time for
      a 2MB (i.e. BLOCK_SIZE) mapping)
      - We walk the page table down to the penultimate level, where we
        find a table entry
      - We overwrite the table entry with a block mapping and return
        without any TLB maintenance and without freeing the memory used
        by the now-orphaned table.

This last step can lead to a walk-cache caching the overwritten table
entry, causing unexpected faults when the new mapping is accessed by a
device. One way to fix this would be to collapse the page table when
freeing the last page at a given level, but this would require expensive
iteration on every map call. Instead, this patch detects the case when
we are overwriting a table entry and explicitly unmaps the table first,
which takes care of both freeing and TLB invalidation.

Cc: <stable@vger.kernel.org>
Reported-by: Brian Starkey <brian.starkey@arm.com>
Tested-by: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Will Deacon 2015-08-11 16:48:32 +01:00 committed by Joerg Roedel
parent 2e169bb3cc
commit cf27ec930b
1 changed files with 16 additions and 1 deletions
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17
drivers/iommu/io-pgtable-arm.c
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@ -263,6 +263,10 @@ static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
sizeof(pte), DMA_TO_DEVICE);
}
static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
unsigned long iova, size_t size, int lvl,
arm_lpae_iopte *ptep);
static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
unsigned long iova, phys_addr_t paddr,
arm_lpae_iopte prot, int lvl,
@ -271,10 +275,21 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
arm_lpae_iopte pte = prot;
struct io_pgtable_cfg *cfg = &data->iop.cfg;
/* We require an unmap first */
if (iopte_leaf(*ptep, lvl)) {
/* We require an unmap first */
WARN_ON(!selftest_running);
return -EEXIST;
} else if (iopte_type(*ptep, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
/*
* We need to unmap and free the old table before
* overwriting it with a block entry.
*/
arm_lpae_iopte *tblp;
size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz))
return -EINVAL;
}
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)