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[2003:d8:2f31:700:3851:c66a:b6b9:3490]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a568b087f8sm13629833f8f.53.2025.06.17.02.25.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Jun 2025 02:25:15 -0700 (PDT) Message-ID: <6afc2e67-3ecb-41a5-9c8f-00ecd64f035a@redhat.com> Date: Tue, 17 Jun 2025 11:25:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/14] mm: Filter zone device pages returned from folio_walk_start() To: Alistair Popple , akpm@linux-foundation.org Cc: linux-mm@kvack.org, gerald.schaefer@linux.ibm.com, dan.j.williams@intel.com, jgg@ziepe.ca, willy@infradead.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, zhang.lyra@gmail.com, debug@rivosinc.com, bjorn@kernel.org, balbirs@nvidia.com, lorenzo.stoakes@oracle.com, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-cxl@vger.kernel.org, dri-devel@lists.freedesktop.org, John@Groves.net, m.szyprowski@samsung.com References: <11dd5b70546ec67593a4bf79f087b113f15d6bb1.1750075065.git-series.apopple@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: EBDDEA0003 X-Stat-Signature: 5i973e9s7dxyqx1hn9e1mdk8hgsgjpeg X-Rspam-User: X-HE-Tag: 1750152319-375410 X-HE-Meta: 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 mjGW+tPs 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 16.06.25 13:58, Alistair Popple wrote: > Previously dax pages were skipped by the pagewalk code as pud_special() or > vm_normal_page{_pmd}() would be false for DAX pages. Now that dax pages are > refcounted normally that is no longer the case, so the pagewalk code will > start returning them. > > Most callers already explicitly filter for DAX or zone device pages so > don't need updating. However some don't, so add checks to those callers. > > Signed-off-by: Alistair Popple > > --- > > Changes since v1: > > - Dropped "mm/pagewalk: Skip dax pages in pagewalk" and replaced it > with this new patch for v2 > > - As suggested by David and Jason we can filter the folios in the > callers instead of doing it in folio_start_walk(). Most callers > already do this (see below). > > I audited all callers of folio_walk_start() and found the following: > > mm/ksm.c: > > break_ksm() - doesn't need to filter zone_device pages because the can > never be KSM pages. > > get_mergeable_page() - already filters out zone_device pages. > scan_get_next_rmap_iterm() - already filters out zone_device_pages. > > mm/huge_memory.c: > > split_huge_pages_pid() - already checks for DAX with > vma_not_suitable_for_thp_split() > > mm/rmap.c: > > make_device_exclusive() - only works on anonymous pages, although > there'd be no issue with finding a DAX page even if support was extended > to file-backed pages. > > mm/migrate.c: > > add_folio_for_migration() - already checks the vma with vma_migratable() > do_pages_stat_array() - explicitly checks for zone_device folios > > kernel/event/uprobes.c: > > uprobe_write_opcode() - only works on anonymous pages, not sure if > zone_device could ever work so add an explicit check > > arch/s390/mm/fault.c: > > do_secure_storage_access() - not sure so be conservative and add a check > > arch/s390/kernel/uv.c: > > make_hva_secure() - not sure so be conservative and add a check > --- > arch/s390/kernel/uv.c | 2 +- > arch/s390/mm/fault.c | 2 +- > kernel/events/uprobes.c | 2 +- > 3 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c > index b99478e..55aa280 100644 > --- a/arch/s390/kernel/uv.c > +++ b/arch/s390/kernel/uv.c > @@ -424,7 +424,7 @@ int make_hva_secure(struct mm_struct *mm, unsigned long hva, struct uv_cb_header > return -EFAULT; > } > folio = folio_walk_start(&fw, vma, hva, 0); > - if (!folio) { > + if (!folio || folio_is_zone_device(folio)) { > mmap_read_unlock(mm); > return -ENXIO; > } > diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c > index e1ad05b..df1a067 100644 > --- a/arch/s390/mm/fault.c > +++ b/arch/s390/mm/fault.c > @@ -449,7 +449,7 @@ void do_secure_storage_access(struct pt_regs *regs) > if (!vma) > return handle_fault_error(regs, SEGV_MAPERR); > folio = folio_walk_start(&fw, vma, addr, 0); > - if (!folio) { > + if (!folio || folio_is_zone_device(folio)) { > mmap_read_unlock(mm); > return; > } Curious, does s390 even support ZONE_DEVICE and could trigger this? > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c > index 8a601df..f774367 100644 > --- a/kernel/events/uprobes.c > +++ b/kernel/events/uprobes.c > @@ -539,7 +539,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct *vma, > } > > ret = 0; > - if (unlikely(!folio_test_anon(folio))) { > + if (unlikely(!folio_test_anon(folio) || folio_is_zone_device(folio))) { > VM_WARN_ON_ONCE(is_register); > folio_put(folio); > goto out; I wonder if __uprobe_write_opcode() would just work with anon device folios? We only modify page content, and conditionally zap the page. Would there be a problem with anon device folios? -- Cheers, David / dhildenb