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A user can invoke mmap_action_map_kernel_pages() to specify that the mapping should map kernel pages starting from desc->start of a specified number of pages specified in an array. In order to implement this, adjust mmap_action_prepare() to be able to return an error code, as it makes sense to assert that the specified parameters are valid as quickly as possible as well as updating the VMA flags to include VMA_MIXEDMAP_BIT as necessary. This provides an mmap_prepare equivalent of vm_insert_pages(). We additionally update the existing vm_insert_pages() code to use range_in_vma() and add a new range_in_vma_desc() helper function for the mmap_prepare case, sharing the code between the two in range_is_subset(). We add both mmap_action_map_kernel_pages() and mmap_action_map_kernel_pages_full() to allow for both partial and full VMA mappings. We update the documentation to reflect the new features. Finally, we update the VMA tests accordingly to reflect the changes. Link: https://lkml.kernel.org/r/926ac961690d856e67ec847bee2370ab3c6b9046.1774045440.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bodo Stroesser <bostroesser@gmail.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Clemens Ladisch <clemens@ladisch.de> Cc: David Hildenbrand <david@kernel.org> Cc: David Howells <dhowells@redhat.com> Cc: Dexuan Cui <decui@microsoft.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Long Li <longli@microsoft.com> Cc: Marc Dionne <marc.dionne@auristor.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Richard Weinberger <richard@nod.at> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Vignesh Raghavendra <vigneshr@ti.com> Cc: Wei Liu <wei.liu@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>