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Fri, 16 Jan 2026 16:13:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id G+EfC79jammyVQAAD6G6ig (envelope-from ); Fri, 16 Jan 2026 16:13:51 +0000 Message-ID: Date: Fri, 16 Jan 2026 17:13:50 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/5] mm/zone_device: Reinitialize large zone device private folios Content-Language: en-US To: Matthew Brost , Alistair Popple Cc: Francois Dugast , intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Zi Yan , adhavan Srinivasan , Nicholas Piggin , Michael Ellerman , "Christophe Leroy (CS GROUP)" , Felix Kuehling , Alex Deucher , =?UTF-8?Q?Christian_K=C3=B6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lyude Paul , Danilo Krummrich , David Hildenbrand , Oscar Salvador , Andrew Morton , Jason Gunthorpe , Leon Romanovsky , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Balbir Singh , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org References: <20260114192111.1267147-1-francois.dugast@intel.com> <20260114192111.1267147-2-francois.dugast@intel.com> <6spceodgfobizdaziju4yvvfydwvvik2wjyoyfuglozq533rgl@vmkotau3m3kw> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[38]; FREEMAIL_CC(0.00)[intel.com,lists.freedesktop.org,nvidia.com,linux.ibm.com,gmail.com,ellerman.id.au,kernel.org,amd.com,ffwll.ch,linux.intel.com,suse.de,redhat.com,linux-foundation.org,ziepe.ca,oracle.com,google.com,suse.com,lists.ozlabs.org,vger.kernel.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLzhxcfrrwnfnqtbioy5kgo5ee)]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,imap1.dmz-prg2.suse.org:helo,intel.com:email,suse.com:email,oracle.com:email,suse.cz:mid,suse.cz:email] On 1/15/26 07:18, Matthew Brost wrote: > On Wed, Jan 14, 2026 at 09:57:31PM -0800, Matthew Brost wrote: >> On Thu, Jan 15, 2026 at 04:27:26PM +1100, Alistair Popple wrote: >> > On 2026-01-15 at 06:19 +1100, Francois Dugast wrote... >> > > From: Matthew Brost >> > > >> > > Reinitialize metadata for large zone device private folios in >> > > zone_device_page_init prior to creating a higher-order zone device >> > > private folio. This step is necessary when the folio’s order changes >> > > dynamically between zone_device_page_init calls to avoid building a >> > > corrupt folio. As part of the metadata reinitialization, the dev_pagemap >> > > must be passed in from the caller because the pgmap stored in the folio >> > > page may have been overwritten with a compound head. >> > >> > Thanks for fixing, a couple of minor comments below. >> > >> > > Cc: Zi Yan >> > > Cc: Alistair Popple >> > > Cc: adhavan Srinivasan >> > > Cc: Nicholas Piggin >> > > Cc: Michael Ellerman >> > > Cc: "Christophe Leroy (CS GROUP)" >> > > Cc: Felix Kuehling >> > > Cc: Alex Deucher >> > > Cc: "Christian König" >> > > Cc: David Airlie >> > > Cc: Simona Vetter >> > > Cc: Maarten Lankhorst >> > > Cc: Maxime Ripard >> > > Cc: Thomas Zimmermann >> > > Cc: Lyude Paul >> > > Cc: Danilo Krummrich >> > > Cc: David Hildenbrand >> > > Cc: Oscar Salvador >> > > Cc: Andrew Morton >> > > Cc: Jason Gunthorpe >> > > Cc: Leon Romanovsky >> > > Cc: Lorenzo Stoakes >> > > Cc: Liam R. Howlett >> > > Cc: Vlastimil Babka >> > > Cc: Mike Rapoport >> > > Cc: Suren Baghdasaryan >> > > Cc: Michal Hocko >> > > Cc: Balbir Singh >> > > Cc: linuxppc-dev@lists.ozlabs.org >> > > Cc: kvm@vger.kernel.org >> > > Cc: linux-kernel@vger.kernel.org >> > > Cc: amd-gfx@lists.freedesktop.org >> > > Cc: dri-devel@lists.freedesktop.org >> > > Cc: nouveau@lists.freedesktop.org >> > > Cc: linux-mm@kvack.org >> > > Cc: linux-cxl@vger.kernel.org >> > > Fixes: d245f9b4ab80 ("mm/zone_device: support large zone device private folios") >> > > Signed-off-by: Matthew Brost >> > > Signed-off-by: Francois Dugast >> > > --- >> > > arch/powerpc/kvm/book3s_hv_uvmem.c | 2 +- >> > > drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 2 +- >> > > drivers/gpu/drm/drm_pagemap.c | 2 +- >> > > drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +- >> > > include/linux/memremap.h | 9 ++++++--- >> > > lib/test_hmm.c | 4 +++- >> > > mm/memremap.c | 20 +++++++++++++++++++- >> > > 7 files changed, 32 insertions(+), 9 deletions(-) >> > > >> > > diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c >> > > index e5000bef90f2..7cf9310de0ec 100644 >> > > --- a/arch/powerpc/kvm/book3s_hv_uvmem.c >> > > +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c >> > > @@ -723,7 +723,7 @@ static struct page *kvmppc_uvmem_get_page(unsigned long gpa, struct kvm *kvm) >> > > >> > > dpage = pfn_to_page(uvmem_pfn); >> > > dpage->zone_device_data = pvt; >> > > - zone_device_page_init(dpage, 0); >> > > + zone_device_page_init(dpage, &kvmppc_uvmem_pgmap, 0); >> > > return dpage; >> > > out_clear: >> > > spin_lock(&kvmppc_uvmem_bitmap_lock); >> > > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c >> > > index af53e796ea1b..6ada7b4af7c6 100644 >> > > --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c >> > > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c >> > > @@ -217,7 +217,7 @@ svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn) >> > > page = pfn_to_page(pfn); >> > > svm_range_bo_ref(prange->svm_bo); >> > > page->zone_device_data = prange->svm_bo; >> > > - zone_device_page_init(page, 0); >> > > + zone_device_page_init(page, page_pgmap(page), 0); >> > > } >> > > >> > > static void >> > > diff --git a/drivers/gpu/drm/drm_pagemap.c b/drivers/gpu/drm/drm_pagemap.c >> > > index 03ee39a761a4..c497726b0147 100644 >> > > --- a/drivers/gpu/drm/drm_pagemap.c >> > > +++ b/drivers/gpu/drm/drm_pagemap.c >> > > @@ -201,7 +201,7 @@ static void drm_pagemap_get_devmem_page(struct page *page, >> > > struct drm_pagemap_zdd *zdd) >> > > { >> > > page->zone_device_data = drm_pagemap_zdd_get(zdd); >> > > - zone_device_page_init(page, 0); >> > > + zone_device_page_init(page, zdd->dpagemap->pagemap, 0); >> > > } >> > > >> > > /** >> > > diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c >> > > index 58071652679d..3d8031296eed 100644 >> > > --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c >> > > +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c >> > > @@ -425,7 +425,7 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm, bool is_large) >> > > order = ilog2(DMEM_CHUNK_NPAGES); >> > > } >> > > >> > > - zone_device_folio_init(folio, order); >> > > + zone_device_folio_init(folio, page_pgmap(folio_page(folio, 0)), order); >> > > return page; >> > > } >> > > >> > > diff --git a/include/linux/memremap.h b/include/linux/memremap.h >> > > index 713ec0435b48..e3c2ccf872a8 100644 >> > > --- a/include/linux/memremap.h >> > > +++ b/include/linux/memremap.h >> > > @@ -224,7 +224,8 @@ static inline bool is_fsdax_page(const struct page *page) >> > > } >> > > >> > > #ifdef CONFIG_ZONE_DEVICE >> > > -void zone_device_page_init(struct page *page, unsigned int order); >> > > +void zone_device_page_init(struct page *page, struct dev_pagemap *pgmap, >> > > + unsigned int order); >> > > void *memremap_pages(struct dev_pagemap *pgmap, int nid); >> > > void memunmap_pages(struct dev_pagemap *pgmap); >> > > void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap); >> > > @@ -234,9 +235,11 @@ bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn); >> > > >> > > unsigned long memremap_compat_align(void); >> > > >> > > -static inline void zone_device_folio_init(struct folio *folio, unsigned int order) >> > > +static inline void zone_device_folio_init(struct folio *folio, >> > > + struct dev_pagemap *pgmap, >> > > + unsigned int order) >> > > { >> > > - zone_device_page_init(&folio->page, order); >> > > + zone_device_page_init(&folio->page, pgmap, order); >> > > if (order) >> > > folio_set_large_rmappable(folio); >> > > } >> > > diff --git a/lib/test_hmm.c b/lib/test_hmm.c >> > > index 8af169d3873a..455a6862ae50 100644 >> > > --- a/lib/test_hmm.c >> > > +++ b/lib/test_hmm.c >> > > @@ -662,7 +662,9 @@ static struct page *dmirror_devmem_alloc_page(struct dmirror *dmirror, >> > > goto error; >> > > } >> > > >> > > - zone_device_folio_init(page_folio(dpage), order); >> > > + zone_device_folio_init(page_folio(dpage), >> > > + page_pgmap(folio_page(page_folio(dpage), 0)), >> > > + order); >> > > dpage->zone_device_data = rpage; >> > > return dpage; >> > > >> > > diff --git a/mm/memremap.c b/mm/memremap.c >> > > index 63c6ab4fdf08..6f46ab14662b 100644 >> > > --- a/mm/memremap.c >> > > +++ b/mm/memremap.c >> > > @@ -477,10 +477,28 @@ void free_zone_device_folio(struct folio *folio) >> > > } >> > > } >> > > >> > > -void zone_device_page_init(struct page *page, unsigned int order) >> > > +void zone_device_page_init(struct page *page, struct dev_pagemap *pgmap, >> > > + unsigned int order) >> > > { >> > > + struct page *new_page = page; >> > > + unsigned int i; >> > > + >> > > VM_WARN_ON_ONCE(order > MAX_ORDER_NR_PAGES); >> > > >> > > + for (i = 0; i < (1UL << order); ++i, ++new_page) { >> > > + struct folio *new_folio = (struct folio *)new_page; >> > > + >> > > + new_page->flags.f &= ~0xffUL; /* Clear possible order, page head */ >> > >> > This seems odd to me, mainly due to the "magic" number. Why not just clear >> > the flags entirely? Or at least explicitly just clear the flags you care about >> > which would remove the need for the comment and should let you use the proper >> > PageFlag functions. >> > >> >> I'm copying this from folio_reset_order [1]. My paranoia about touching >> anything related to struct page is high, so I did the same thing >> folio_reset_order does here. >> >> [1] https://elixir.bootlin.com/linux/v6.18.5/source/include/linux/mm.h#L1075 >> > > This immediately hangs my first SVM test... > > diff --git a/mm/memremap.c b/mm/memremap.c > index 6f46ab14662b..ef8c56876cf5 100644 > --- a/mm/memremap.c > +++ b/mm/memremap.c > @@ -488,7 +488,7 @@ void zone_device_page_init(struct page *page, struct dev_pagemap *pgmap, > for (i = 0; i < (1UL << order); ++i, ++new_page) { > struct folio *new_folio = (struct folio *)new_page; > > - new_page->flags.f &= ~0xffUL; /* Clear possible order, page head */ > + new_page->flags.f = 0; > #ifdef NR_PAGES_IN_LARGE_FOLIO > ((struct folio *)(new_page - 1))->_nr_pages = 0; > #endif the flags field includes also zone and node id, so clearing that will break the pages's node+zone association, that's probably why...