Message-ID: <20251016172853.52451-1-seanjc@google.com>
Date: Thu, 16 Oct 2025 10:28:41 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Paolo Bonzini <pbonzini@...hat.com>, 
	Sean Christopherson <seanjc@...gle.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Ackerley Tng <ackerleytng@...gle.com>, Shivank Garg <shivankg@....com>, 
	David Hildenbrand <david@...hat.com>, Fuad Tabba <tabba@...gle.com>, Ashish Kalra <ashish.kalra@....com>, 
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH v13 00/12] KVM: guest_memfd: Add NUMA mempolicy support

Miguel, you got pulled in due to a one-line change to add a new iterator
macros in .clang-format.

Shivank's series to add support for NUMA-aware memory placement in
guest_memfd.  Based on kvm-x86/next.

Note, Ackerley pointed out that we should probably have testing for the
cpuset_do_page_mem_spread() behavior.  I 100% agree, but I'm also a-ok
merging without those tests.

v13:
 - Collect reviews.
 - Add kvm_gmem_for_each_file to .clang-format. [Ackerley]
 - Fix typos. [Ackerley]
 - Don't use get_task_policy() if the guest_memfd doesn't have its own
   policy, so that cpuset_do_page_mem_spread() works. [Ackerley]
 - Fix goofs in the changelogs related to numaif.h. [Ackerley]

v12:
 - https://lore.kernel.org/all/20251007221420.344669-1-seanjc@google.com
 - Add missing functionality to KVM selftests' existing numaif.h instead of
   linking to libnuma (which appears to have caveats with -static).
 - Add KVM_SYSCALL_DEFINE() infrastructure to reduce the boilerplate needed
   to wrap syscalls and/or to assert that a syscall succeeds.
 - Rename kvm_gmem to gmem_file, and use gmem_inode for the inode structure.
 - Track flags in a gmem_inode field instead of using i_private.
 - Add comments to call out subtleties in the mempolicy code (e.g. that
   returning NULL for vm_operations_struct.get_policy() is important for ABI
   reasons).
 - Improve debugability of guest_memfd_test (I kept generating SIGBUS when
   tweaking the tests).
 - Test mbind() with private memory (sadly, verifying placement with
   move_pages() doesn't work due to the dependency on valid page tables).

- V11: Rebase on kvm-next, remove RFC tag, use Ackerley's latest patch
       and fix a rcu race bug during kvm module unload.
- V10: Rebase on top of Fuad's V17. Use latest guest_memfd inode patch
       from Ackerley (with David's review comments). Use newer kmem_cache_create()
       API variant with arg parameter (Vlastimil)
- v9: Rebase on top of Fuad's V13 and incorporate review comments
- v8: Rebase on top of Fuad's V12: Host mmaping for guest_memfd memory.
- v7: Use inodes to store NUMA policy instead of file [0].
- v4-v6: Current approach using shared_policy support and vm_ops (based on
         suggestions from David [1] and guest_memfd bi-weekly upstream
         call discussion [2]).
- v3: Introduced fbind() syscall for VMM memory-placement configuration.
- v1,v2: Extended the KVM_CREATE_GUEST_MEMFD IOCTL to pass mempolicy.

[0] https://lore.kernel.org/all/diqzbjumm167.fsf@ackerleytng-ctop.c.googlers.com
[1] https://lore.kernel.org/all/6fbef654-36e2-4be5-906e-2a648a845278@redhat.com
[2] https://lore.kernel.org/all/2b77e055-98ac-43a1-a7ad-9f9065d7f38f@amd.com

Ackerley Tng (1):
  KVM: guest_memfd: Use guest mem inodes instead of anonymous inodes

Sean Christopherson (7):
  KVM: guest_memfd: Rename "struct kvm_gmem" to "struct gmem_file"
  KVM: guest_memfd: Add macro to iterate over gmem_files for a
    mapping/inode
  KVM: selftests: Define wrappers for common syscalls to assert success
  KVM: selftests: Report stacktraces SIGBUS, SIGSEGV, SIGILL, and SIGFPE
    by default
  KVM: selftests: Add additional equivalents to libnuma APIs in KVM's
    numaif.h
  KVM: selftests: Use proper uAPI headers to pick up mempolicy.h
    definitions
  KVM: guest_memfd: Add gmem_inode.flags field instead of using
    i_private

Shivank Garg (4):
  KVM: guest_memfd: Add slab-allocated inode cache
  KVM: guest_memfd: Enforce NUMA mempolicy using shared policy
  KVM: selftests: Add helpers to probe for NUMA support, and multi-node
    systems
  KVM: selftests: Add guest_memfd tests for mmap and NUMA policy support

 .clang-format                                 |   1 +
 include/uapi/linux/magic.h                    |   1 +
 tools/testing/selftests/kvm/arm64/vgic_irq.c  |   2 +-
 .../testing/selftests/kvm/guest_memfd_test.c  |  98 ++++++
 .../selftests/kvm/include/kvm_syscalls.h      |  81 +++++
 .../testing/selftests/kvm/include/kvm_util.h  |  29 +-
 tools/testing/selftests/kvm/include/numaif.h  | 110 +++---
 .../selftests/kvm/kvm_binary_stats_test.c     |   4 +-
 tools/testing/selftests/kvm/lib/kvm_util.c    |  55 +--
 .../kvm/x86/private_mem_conversions_test.c    |   9 +-
 .../selftests/kvm/x86/xapic_ipi_test.c        |   5 +-
 virt/kvm/guest_memfd.c                        | 331 ++++++++++++++----
 virt/kvm/kvm_main.c                           |   7 +-
 virt/kvm/kvm_mm.h                             |   9 +-
 14 files changed, 565 insertions(+), 177 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/kvm_syscalls.h


base-commit: f222788458c8a7753d43befef2769cd282dc008e
-- 
2.51.0.858.gf9c4a03a3a-goog

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