From: "David Hildenbrand (Red Hat)" <david@kernel.org>
To: Mike Rapoport <rppt@kernel.org>, linux-mm@kvack.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Axel Rasmussen <axelrasmussen@google.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Hugh Dickins <hughd@google.com>,
James Houghton <jthoughton@google.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Michal Hocko <mhocko@suse.com>,
Nikita Kalyazin <kalyazin@amazon.com>,
Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Shuah Khan <shuah@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH 2/5] userfaultfd, shmem: use a VMA callback to handle UFFDIO_CONTINUE
Date: Mon, 24 Nov 2025 12:03:17 +0100 [thread overview]
Message-ID: <a06e57ff-b77b-44fd-9b69-929d7647644b@kernel.org> (raw)
In-Reply-To: <20251123102707.559422-3-rppt@kernel.org>
On 11/23/25 11:27, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
>
> When userspace resolves a page fault in a shmem VMA with UFFDIO_CONTINUE
> it needs to get a folio that already exists in the pagecache backing
> that VMA.
>
> Instead of using shmem_get_folio() for that, add a get_pagecache_folio()
get_shared_folio()
Given that the helper now no longer receives a VMA, I assume we can just
really call it get_folio() and the "shared" part would be implicit.
(from the inode)
> method to 'struct vm_operations_struct' that will return a folio if it
> exists in the VMA's pagecache at given pgoff.
>
> Implement get_pagecache_folio() method for shmem and slightly refactor
> userfaultfd's mfill_atomic() and mfill_atomic_pte_continue() to support
> this new API.
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> ---
Nothing else jumped at me :)
--
Cheers
David
next prev parent reply other threads:[~2025-11-24 11:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-23 10:27 [PATCH 0/5] mm, kvm: add guest_memfd support for uffd minor faults Mike Rapoport
2025-11-23 10:27 ` [PATCH 1/5] userfaultfd: move vma_can_userfault out of line Mike Rapoport
2025-11-23 10:27 ` [PATCH 2/5] userfaultfd, shmem: use a VMA callback to handle UFFDIO_CONTINUE Mike Rapoport
2025-11-24 11:03 ` David Hildenbrand (Red Hat) [this message]
2025-11-25 14:29 ` Mike Rapoport
2025-11-23 10:27 ` [PATCH 3/5] mm: introduce VM_FAULT_UFFD_MINOR fault reason Mike Rapoport
2025-11-24 11:05 ` David Hildenbrand (Red Hat)
2025-11-24 15:09 ` Mike Rapoport
2025-11-23 10:27 ` [PATCH 4/5] guest_memfd: add support for userfaultfd minor mode Mike Rapoport
2025-11-23 10:27 ` [PATCH 5/5] KVM: selftests: test userfaultfd minor for guest_memfd Mike Rapoport
2025-11-24 10:59 ` [PATCH 0/5] mm, kvm: add guest_memfd support for uffd minor faults David Hildenbrand (Red Hat)
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