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 Q6juY/DV 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Jun 24, 2026 at 2:53 AM EDT, Wei Yang wrote: > Commit 65edfda6f3f2 ("mm/rmap: extend rmap and migration support > device-private entries") introduced the concept of device-private > PMD entries, but did not correctly update the rmap walk code to > account for them. > > As a result, when page_vma_mapped_walk() encounters device-private > PMD entries, it takes no action other than to acquire the PMD lock > and exit. > > However this is highly problematic for two reasons - firstly, > device private entries possess a PFN so check_pmd() needs to be > called to ensure an overlapping PFN range. > > Secondly, and more importantly, if PVMW_MIGRATION is set the > caller assumes the returned entry is a migration entry, resulting > in memory corruption when the caller tries to interpret the device > private entry as such. > > In addition, commit 146287290023 ("mm/huge_memory: implement > device-private THP splitting") allowed device private PMDs to be > split like THP mappings, but again did not update this code path. > > As a result, we might race a PMD split prior to acquiring the PMD > lock. > > This patch addresses all of these issues by invoking check_pmd(), > ensuring PMVW_MIGRATION is not set and checks whether a split raced > us we do for PMD THP and migration entries. > > Fixes: 65edfda6f3f2 ("mm/rmap: extend rmap and migration support device-p= rivate entries") > Cc: > Signed-off-by: Wei Yang > Suggested-by: David Hildenbrand > Cc: David Hildenbrand > Cc: Balbir Singh > Cc: SeongJae Park > Cc: Zi Yan > Cc: Lorenzo Stoakes > Cc: Lance Yang > > --- > v4: > * refine subject and commit log based on Lorenzo's suggestion > * put pmd device-private entry handling in its own if branch, > suggested by Lorenzo > > v3: > * remove cleanup part, only fix the issue for device-private entry > * refine user effect description based on Lorenzo's suggestion > > v2: https://lore.kernel.org/all/20260616063436.20455-1-richard.weiyang@gm= ail.com/T/#u > * specify the possible error case of current code and user visible effe= ct > * besides fix, cleanup the pmd entry handling based on David's suggesti= on > > v1: https://lore.kernel.org/linux-mm/20260508013728.21285-1-richard.weiya= ng@gmail.com/ > --- > mm/page_vma_mapped.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) > LGTM. The discussion from the patch history is very valuable. Thanks. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi