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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki , Emil Tsalapatis References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-13-923b70125b1e@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv 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32sIPTNQ30Og/AJvpGCIWasztTn2vptZgjX5fiFk73Ghzxl4qrOa6iDUEv8iCXREEVsOrDqJXrYN6uDwjChLYY/gtx3TrQ0DgarFaKeghnEi8f6ljyHcKkm2s63wYIY35Vttn1giL9QyRJOuzbwgrdMas0TiuOHImM22FkARZgkCIaqU9/vVGY1kRTbIGN7sm1bs6xrGrZbuGeZXNdFah13+mhyQT61bRqIyHVFPXucJmXL/uXnxoHDn+NSaMo/g51o1n1g2YNcugsFd8ryVcO53BuAaFkYCnIl3KiIZ86ytS86lGwkm83sTn5ztQrZO+H9cBnWu2zkZnjd6+8IMb7qdXUiPFIuATxu+NpeWa9qaiFZ6wgkCk8QcEr1KZ0bs712E2cxovsqSL/e9OZmD0QUM+l21iQUR3OispuV/sz42VrJniVmXW0MpSIewU+43wMwNgo390CBw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/9/26 20:04, Lorenzo Stoakes (ARM) wrote: > The bpf_map->ops->map_mmap callback invoked by bpf_map_mmap() can be set to > one of ringbuf_map_mmap_kern(), ringbuf_map_mmap_user(), array_map_mmap() > or arena_map_mmap(). > > It is convention in mm to mark mappings whose pages the kernel manages > itself with VM_MIXEDMAP, so core mm knows not to treat them as ordinary > page cache or anonymous memory. > > The map_mmap callbacks ringbuf_map_mmap_kern() and ringbuf_map_mmap_user() > use remap_vmalloc_range(), which ultimately invokes vm_insert_page() and so > marks the ranges VM_MIXEDMAP, and array_map_mmap() sets VM_MIXEDMAP > explicitly. > > However, the exception to this is arena_map_mmap(), which doesn't set the > flag. > > This patch corrects this and updates the comment to reflect it. > > The pages are refcounted and vm_normal_page() finds them regardless of the > flag, and VM_DONTEXPAND remains set (marking the memory as VM_SPECIAL and > thus unmergeable). The one effect is that NUMA balancing now skips these > VMAs, as it already does for the other bpf map mappings, which is the > reason array_map_mmap() gives for setting the flag. > > The intent of this patch is to be able to establish the invariant that only > PFN-mapped or mixed map ranges may clear the VM_MAYWRITE flag, as is done > in bpf_map_mmap(). > > Reviewed-by: Emil Tsalapatis > Reviewed-by: Suren Baghdasaryan > Signed-off-by: Lorenzo Stoakes (ARM) > --- > kernel/bpf/arena.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c > index 7b6847200b43..b69fe5e34339 100644 > --- a/kernel/bpf/arena.c > +++ b/kernel/bpf/arena.c > @@ -620,8 +620,9 @@ static int arena_map_mmap(struct bpf_map *map, struct vm_area_struct *vma) > * clears VM_MAYEXEC. Set VM_DONTEXPAND to avoid potential change > * of user_vm_start. Set VM_DONTCOPY to prevent arena VMA from > * being copied into the child process on fork. > + * This is a kernel page so set VM_MIXEDMAP. > */ > - vm_flags_set(vma, VM_DONTEXPAND | VM_DONTCOPY); > + vm_flags_set(vma, VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTCOPY); > vma->vm_ops = &arena_vm_ops; > return 0; > } > Historically, VM_MIXEDMAP really just means: can contain refcounted and non-refcounted things. Everything with a struct page is refcounted. I think we are now changing the semantics to mean "maps kernel pages". I think this is fine, but we really have to update the documentation (and possibly rename this thing to something more expressive?) Acked-by: David Hildenbrand (Arm) -- Cheers, David