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 v2 4/5] guest_memfd: add support for userfaultfd minor mode
Date: Wed, 26 Nov 2025 11:25:25 +0100 [thread overview]
Message-ID: <3d5096cd-39b5-4280-95a1-78998a4e609e@kernel.org> (raw)
In-Reply-To: <20251125183840.2368510-5-rppt@kernel.org>
On 11/25/25 19:38, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
>
> userfaultfd notifications about minor page faults used for live migration
> and snapshotting of VMs with memory backed by shared hugetlbfs or tmpfs
> mappings as described in detail in commit 7677f7fd8be7 ("userfaultfd: add
> minor fault registration mode").
>
> To use the same mechanism for VMs that use guest_memfd to map their memory,
> guest_memfd should support userfaultfd minor mode.
>
> Extend ->fault() method of guest_memfd with ability to notify core page
> fault handler that a page fault requires handle_userfault(VM_UFFD_MINOR) to
> complete and add implementation of ->get_shared_folio() to guest_memfd
> vm_ops.
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> ---
No exports and still looks clean to me, nice. :)
--
Cheers
David
next prev parent reply other threads:[~2025-11-26 10:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-25 18:38 [PATCH v2 0/5] mm, kvm: add guest_memfd support for uffd minor faults Mike Rapoport
2025-11-25 18:38 ` [PATCH v2 1/5] userfaultfd: move vma_can_userfault out of line Mike Rapoport
2025-11-26 15:05 ` Liam R. Howlett
2025-11-25 18:38 ` [PATCH v2 2/5] userfaultfd, shmem: use a VMA callback to handle UFFDIO_CONTINUE Mike Rapoport
2025-11-26 10:21 ` David Hildenbrand (Red Hat)
2025-11-26 15:11 ` Liam R. Howlett
2025-11-25 18:38 ` [PATCH v2 3/5] mm: introduce VM_FAULT_UFFD_MINOR fault reason Mike Rapoport
2025-11-25 19:21 ` Peter Xu
2025-11-27 11:18 ` Mike Rapoport
2025-11-27 14:10 ` Peter Xu
2025-11-30 11:05 ` Mike Rapoport
2025-11-26 10:19 ` David Hildenbrand (Red Hat)
2025-11-26 15:19 ` Liam R. Howlett
2025-11-26 16:49 ` Nikita Kalyazin
2025-11-25 18:38 ` [PATCH v2 4/5] guest_memfd: add support for userfaultfd minor mode Mike Rapoport
2025-11-26 10:25 ` David Hildenbrand (Red Hat) [this message]
2025-11-26 15:22 ` Liam R. Howlett
2025-11-26 16:49 ` Nikita Kalyazin
2025-11-27 10:36 ` Mike Rapoport
2025-11-27 11:19 ` Nikita Kalyazin
2025-11-27 19:04 ` Mike Rapoport
2025-11-28 12:15 ` Nikita Kalyazin
2025-11-27 11:27 ` David Hildenbrand (Red Hat)
2025-11-25 18:38 ` [PATCH v2 5/5] KVM: selftests: test userfaultfd minor for guest_memfd Mike Rapoport
2025-11-26 15:23 ` Liam R. Howlett
2025-11-26 16:49 ` Nikita Kalyazin
2025-11-27 10:39 ` Mike Rapoport
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3d5096cd-39b5-4280-95a1-78998a4e609e@kernel.org \
--to=david@kernel.org \
--cc=Liam.Howlett@oracle.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=axelrasmussen@google.com \
--cc=baolin.wang@linux.alibaba.com \
--cc=hughd@google.com \
--cc=jthoughton@google.com \
--cc=kalyazin@amazon.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=mhocko@suse.com \
--cc=pbonzini@redhat.com \
--cc=peterx@redhat.com \
--cc=rppt@kernel.org \
--cc=seanjc@google.com \
--cc=shuah@kernel.org \
--cc=surenb@google.com \
--cc=vbabka@suse.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).