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[2003:d8:2f1a:3700:2982:b5f7:a04e:4cb4]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4532e24420csm45559825e9.20.2025.06.13.02.27.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Jun 2025 02:27:05 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, David Hildenbrand , Andrew Morton , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Dan Williams , Oscar Salvador , Jason Gunthorpe , stable@vger.kernel.org Subject: [PATCH v3 1/3] mm/huge_memory: don't ignore queried cachemode in vmf_insert_pfn_pud() Date: Fri, 13 Jun 2025 11:27:00 +0200 Message-ID: <20250613092702.1943533-2-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250613092702.1943533-1-david@redhat.com> References: <20250613092702.1943533-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" We setup the cache mode but ... don't forward the updated pgprot to insert_pfn_pud(). Only a problem on x86-64 PAT when mapping PFNs using PUDs that require a special cachemode. Fix it by using the proper pgprot where the cachemode was setup. It is unclear in which configurations we would get the cachemode wrong: through vfio seems possible. Getting cachemodes wrong is usually ... bad. As the fix is easy, let's backport it to stable. Identified by code inspection. Fixes: 7b806d229ef1 ("mm: remove vmf_insert_pfn_xxx_prot() for huge page-ta= ble entries") Reviewed-by: Dan Williams Reviewed-by: Lorenzo Stoakes Reviewed-by: Jason Gunthorpe Tested-by: Dan Williams Cc: Signed-off-by: David Hildenbrand Reviewed-by: Oscar Salvador --- mm/huge_memory.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d3e66136e41a3..49b98082c5401 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1516,10 +1516,9 @@ static pud_t maybe_pud_mkwrite(pud_t pud, struct vm_= area_struct *vma) } =20 static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr, - pud_t *pud, pfn_t pfn, bool write) + pud_t *pud, pfn_t pfn, pgprot_t prot, bool write) { struct mm_struct *mm =3D vma->vm_mm; - pgprot_t prot =3D vma->vm_page_prot; pud_t entry; =20 if (!pud_none(*pud)) { @@ -1581,7 +1580,7 @@ vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, p= fn_t pfn, bool write) pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); =20 ptl =3D pud_lock(vma->vm_mm, vmf->pud); - insert_pfn_pud(vma, addr, vmf->pud, pfn, write); + insert_pfn_pud(vma, addr, vmf->pud, pfn, pgprot, write); spin_unlock(ptl); =20 return VM_FAULT_NOPAGE; @@ -1625,7 +1624,7 @@ vm_fault_t vmf_insert_folio_pud(struct vm_fault *vmf,= struct folio *folio, add_mm_counter(mm, mm_counter_file(folio), HPAGE_PUD_NR); } insert_pfn_pud(vma, addr, vmf->pud, pfn_to_pfn_t(folio_pfn(folio)), - write); + vma->vm_page_prot, write); spin_unlock(ptl); =20 return VM_FAULT_NOPAGE; --=20 2.49.0