Re: [GIT PULL] KVM: x86: guest_memfd changes for 7.2

[Paolo Bonzini]

On Fri, Jun 12, 2026 at 2:48 AM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> Fix a few bugs found by AI (mostly by Sashiko pointing out pre-existing bugs).
>
> The following changes since commit b7fbe9a1bf9ee6c967ef77d366ca58c35fcf1887:
>
>   Merge branch 'kvm-apx-prepare' into HEAD (2026-05-13 12:38:31 -0400)
>
> are available in the Git repository at:
>
>   https://github.com/kvm-x86/linux.git tags/kvm-x86-gmem-7.2
>
> for you to fetch changes up to 48dbe473219832788c3940c84faa7f1df4375d5d:
>
>   KVM: guest_memfd: fix NUMA interleave index double-counting (2026-06-08 09:15:43 -0700)

Pulled, thanks.

Paolo

> ----------------------------------------------------------------
> KVM guest_memfd changes for 7.2
>
>  - Return -EEXIST instead of -EINVAL if userspace attempts to bind a gmem
>    range to multiple memslots, and fix the test that was supposed to ensure
>    KVM returns -EEXIST.
>
>  - Treat memslot binding offsets and sizes as unsigned values to fix a bug
>    where KVM interprets a large "offset + size" as a negative value and allows
>    a nonsensical offset.
>
>  - Use the inode number instead of the page offset for the NUMA interleaving
>    index to fix a bug where the effective index would jump by two for
>    consecutive pages (the caller also adds in the page offset).
>
> ----------------------------------------------------------------
> Michael S. Tsirkin (1):
>       KVM: guest_memfd: fix NUMA interleave index double-counting
>
> Sean Christopherson (4):
>       KVM: selftests: Remove unnecessary "%s" formatting of a constant string
>       KVM: guest_memfd: Treat memslot binding offset+size as unsigned values
>       KVM: selftests: Expand the guest_memfd test macros to allow passing the VM
>       KVM: selftests: Add guest_memfd regression test signed offset+size bug
>
> Zongyao Chen (2):
>       KVM: guest_memfd: Return -EEXIST for overlapping bindings
>       KVM: selftests: Test guest_memfd binding overlap without GPA overlap
>
>  tools/testing/selftests/kvm/guest_memfd_test.c     | 24 +++++++++++++++--
>  .../testing/selftests/kvm/set_memory_region_test.c | 31 +++++++++++++++++++---
>  virt/kvm/guest_memfd.c                             | 16 ++++++-----
>  virt/kvm/kvm_mm.h                                  |  7 +++--
>  4 files changed, 63 insertions(+), 15 deletions(-)
>