From: Jason Gunthorpe <jgg@nvidia.com>
To: Peter Xu <peterx@redhat.com>
Cc: kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Nico Pache <npache@redhat.com>,
Zi Yan <ziy@nvidia.com>, Alex Mastro <amastro@fb.com>,
David Hildenbrand <david@redhat.com>,
Alex Williamson <alex@shazbot.org>, Zhi Wang <zhiw@nvidia.com>,
David Laight <david.laight.linux@gmail.com>,
Yi Liu <yi.l.liu@intel.com>, Ankit Agrawal <ankita@nvidia.com>,
Kevin Tian <kevin.tian@intel.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v2 2/4] mm: Add file_operations.get_mapping_order()
Date: Fri, 19 Dec 2025 10:59:57 -0400 [thread overview]
Message-ID: <20251219145957.GD254720@nvidia.com> (raw)
In-Reply-To: <aUG2ne_zMyR0eCLX@x1.local>
On Tue, Dec 16, 2025 at 02:44:29PM -0500, Peter Xu wrote:
> > > Or maybe I misunderstood what you're suggesting to document? If so, please
> > > let me know; some example would be greatly helpful.
> >
> > Just document the 'VA % order = pgoff % order' equation in the kdoc
> > for the new op.
>
> When it's "related to PTEs", it's talking about (2) above, so that's really
> what I want to avoid mentioning.
You can't avoid it. Drivers must ensure that
pgoff % order == physical % order
And that is something only drivers can do by knowing about this
requirement.
Jason
next prev parent reply other threads:[~2025-12-19 15:00 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-04 15:09 [PATCH v2 0/4] mm/vfio: huge pfnmaps with !MAP_FIXED mappings Peter Xu
2025-12-04 15:10 ` [PATCH v2 1/4] mm/thp: Allow thp_get_unmapped_area_vmflags() to take alignment Peter Xu
2025-12-04 15:10 ` [PATCH v2 2/4] mm: Add file_operations.get_mapping_order() Peter Xu
2025-12-04 15:19 ` Peter Xu
2025-12-08 9:21 ` Matthew Wilcox
2025-12-10 20:24 ` Peter Xu
2025-12-07 16:21 ` Jason Gunthorpe
2025-12-10 20:23 ` Peter Xu
2025-12-16 14:44 ` Jason Gunthorpe
2025-12-16 15:42 ` Peter Xu
2025-12-16 17:19 ` Jason Gunthorpe
2025-12-16 17:36 ` Peter Xu
2025-12-16 18:58 ` Jason Gunthorpe
2025-12-16 19:44 ` Peter Xu
2025-12-19 14:59 ` Jason Gunthorpe [this message]
2025-12-19 15:13 ` Peter Xu
2025-12-19 15:20 ` Jason Gunthorpe
2025-12-19 15:53 ` Peter Xu
2025-12-04 15:10 ` [PATCH v2 3/4] vfio: Introduce vfio_device_ops.get_mapping_order hook Peter Xu
2025-12-04 15:10 ` [PATCH v2 4/4] vfio-pci: Best-effort huge pfnmaps with !MAP_FIXED mappings Peter Xu
2025-12-05 4:33 ` kernel test robot
2025-12-05 7:45 ` kernel test robot
2025-12-07 16:26 ` Jason Gunthorpe
2025-12-10 20:43 ` Peter Xu
2025-12-16 14:42 ` Jason Gunthorpe
2025-12-16 16:01 ` Peter Xu
2025-12-16 19:01 ` Jason Gunthorpe
2025-12-16 19:58 ` Peter Xu
2025-12-08 3:11 ` Alex Mastro
2025-12-04 18:16 ` [PATCH v2 0/4] mm/vfio: " Cédric Le Goater
2025-12-07 9:13 ` Alex Mastro
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