[GIT PULL] KVM/arm64 fixes for 7.2, take #2

[Paolo Bonzini]

On Wed, Jul 8, 2026 at 6:13 PM Marc Zyngier <maz at kernel.org> wrote:
>
> Paolo,
>
> Here's the second drop of KVM/arm64 fixes for 7.2. This time around,
> we have a locking issue in kvm_io_bus_get_dev(), which is only used by
> arm64, a few S2 page table fixes, a set of FFA proxy fixes for pKVM,
> and finally a very esoteric fix for emulation of sign-extended loads
> from MMIO. Not only this is rather niche, it dates back to day one of
> KVM support for 32bit ARM...
>
> Note that this is on top of the kvmarm-fixes-7.2-1 tag pull request
> posted at [1] about 12 days ago.

Yes, pulled that first and then this one.

Paolo

> Please pull,
>
>         M.
>
> [1] https://lore.kernel.org/all/20260626133526.817232-1-maz@kernel.org
>
> The following changes since commit d098bb75d14fde2f12155f1a95ec0168160867ce:
>
>   KVM: arm64: account pKVM reclaim against the VM mm (2026-06-22 10:48:08 +0100)
>
> are available in the Git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-7.2-2
>
> for you to fetch changes up to 8d187d4b33c262c0f3e44842553521151d8629e8:
>
>   KVM: arm64: Fix propagation of TLBI level in kvm_pgtable_stage2_relax_perms() (2026-07-07 17:43:39 +0100)
>
> ----------------------------------------------------------------
> KVM/arm64 fixes for 7.2, take #2
>
> - Move locking for kvm_io_bus_get_dev() into the caller, ensuring
>   race-free checks that the returned object is of the correct type
>
> - Fix initialisation of the page-table walk level when relaxing
>   permissions
>
> - Correctly update the XN attribute when relaxing permissions
>
> - Fix the sign extension of loads from emulated MMIO regions
>
> - Assorted collection of fixes for pKVM's FFA proxy, together with a
>   couple of FFA driver adjustments
>
> ----------------------------------------------------------------
> Fuad Tabba (2):
>       KVM: arm64: Fix sign-extension of MMIO loads
>       KVM: arm64: selftests: Add MMIO sign-extending load test
>
> Marc Zyngier (2):
>       KVM: Move kvm_io_bus_get_dev() locking responsibilities to callers
>       KVM: arm64: Fix propagation of TLBI level in kvm_pgtable_stage2_relax_perms()
>
> Mostafa Saleh (3):
>       KVM: arm64: Fix bounds checking in do_ffa_mem_reclaim()
>       KVM: arm64: Ensure FFA ranges are page aligned
>       firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit()
>
> Oliver Upton (2):
>       KVM: arm64: Ensure level is always initialized when relaxing perms
>       KVM: arm64: Only update XN attr when requested during S2 relaxation
>
> Sebastian Ene (3):
>       KVM: arm64: Validate the offset to the mem access descriptor
>       KVM: arm64: Zero out the stack initialized data in the FFA handler
>       firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation
>
>  arch/arm64/kvm/hyp/nvhe/ffa.c                     |  44 ++--
>  arch/arm64/kvm/hyp/pgtable.c                      |  15 +-
>  arch/arm64/kvm/mmio.c                             |   7 +-
>  arch/arm64/kvm/vgic/vgic-its.c                    |   2 +
>  drivers/firmware/arm_ffa/driver.c                 |  25 ++-
>  include/linux/arm_ffa.h                           |   9 +-
>  tools/testing/selftests/kvm/Makefile.kvm          |   1 +
>  tools/testing/selftests/kvm/arm64/mmio_sign_ext.c | 255 ++++++++++++++++++++++
>  virt/kvm/kvm_main.c                               |  16 +-
>  9 files changed, 331 insertions(+), 43 deletions(-)
>  create mode 100644 tools/testing/selftests/kvm/arm64/mmio_sign_ext.c
>