From: Jason Gunthorpe <jgg@mellanox.com>
Date: Tue, 12 Nov 2019 16:22:20 -0400
Subject: mm/hmm: allow hmm_range to be used with a mmu_interval_notifier or
hmm_mirror
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Git-commit: 04ec32fbc2b29a640d67872d2f88daac4c73e45b
Patch-mainline: v5.5-rc1
References: jsc#SLE-16387
hmm_mirror's handling of ranges does not use a sequence count which
results in this bug:
CPU0 CPU1
hmm_range_wait_until_valid(range)
valid == true
hmm_range_fault(range)
hmm_invalidate_range_start()
range->valid = false
hmm_invalidate_range_end()
range->valid = true
hmm_range_valid(range)
valid == true
Where the hmm_range_valid() should not have succeeded.
Adding the required sequence count would make it nearly identical to the
new mmu_interval_notifier. Instead replace the hmm_mirror stuff with
mmu_interval_notifier.
Co-existence of the two APIs is the first step.
Link: https://lore.kernel.org/r/20191112202231.3856-4-jgg@ziepe.ca
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Tested-by: Philip Yang <Philip.Yang@amd.com>
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
include/linux/hmm.h | 5 +++++
mm/hmm.c | 25 +++++++++++++++++++------
2 files changed, 24 insertions(+), 6 deletions(-)
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -145,6 +145,9 @@ enum hmm_pfn_value_e {
/*
* struct hmm_range - track invalidation lock on virtual address range
*
+ * @notifier: an optional mmu_interval_notifier
+ * @notifier_seq: when notifier is used this is the result of
+ * mmu_interval_read_begin()
* @hmm: the core HMM structure this range is active against
* @vma: the vm area struct for the range
* @list: all range lock are on a list
@@ -159,6 +162,8 @@ enum hmm_pfn_value_e {
* @valid: pfns array did not change since it has been fill by an HMM function
*/
struct hmm_range {
+ struct mmu_interval_notifier *notifier;
+ unsigned long notifier_seq;
struct hmm *hmm;
struct list_head list;
unsigned long start;
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -858,6 +858,14 @@ void hmm_range_unregister(struct hmm_ran
}
EXPORT_SYMBOL(hmm_range_unregister);
+static bool needs_retry(struct hmm_range *range)
+{
+ if (range->notifier)
+ return mmu_interval_check_retry(range->notifier,
+ range->notifier_seq);
+ return !range->valid;
+}
+
static const struct mm_walk_ops hmm_walk_ops = {
.pud_entry = hmm_vma_walk_pud,
.pmd_entry = hmm_vma_walk_pmd,
@@ -898,18 +906,23 @@ long hmm_range_fault(struct hmm_range *r
const unsigned long device_vma = VM_IO | VM_PFNMAP | VM_MIXEDMAP;
unsigned long start = range->start, end;
struct hmm_vma_walk hmm_vma_walk;
- struct hmm *hmm = range->hmm;
+ struct mm_struct *mm;
struct vm_area_struct *vma;
int ret;
- lockdep_assert_held(&hmm->mmu_notifier.mm->mmap_sem);
+ if (range->notifier)
+ mm = range->notifier->mm;
+ else
+ mm = range->hmm->mmu_notifier.mm;
+
+ lockdep_assert_held(&mm->mmap_sem);
do {
/* If range is no longer valid force retry. */
- if (!range->valid)
+ if (needs_retry(range))
return -EBUSY;
- vma = find_vma(hmm->mmu_notifier.mm, start);
+ vma = find_vma(mm, start);
if (vma == NULL || (vma->vm_flags & device_vma))
return -EFAULT;
@@ -939,7 +952,7 @@ long hmm_range_fault(struct hmm_range *r
start = hmm_vma_walk.last;
/* Keep trying while the range is valid. */
- } while (ret == -EBUSY && range->valid);
+ } while (ret == -EBUSY && !needs_retry(range));
if (ret) {
unsigned long i;
@@ -997,7 +1010,7 @@ long hmm_range_dma_map(struct hmm_range
continue;
/* Check if range is being invalidated */
- if (!range->valid) {
+ if (needs_retry(range)) {
ret = -EBUSY;
goto unmap;
}