[PATCH v3 00/36] KVM: arm64: Add support for protected guest memory with pKVM

[Fuad Tabba]

Hi Will,

On Thu, 5 Mar 2026 at 14:44, Will Deacon <will at kernel.org> wrote:
>
> Hi everyone,
>
> Here's v3 of the patches previously posted here:
>
>   v1: https://lore.kernel.org/kvmarm/20260105154939.11041-1-will@kernel.org/
>   v2: https://lore.kernel.org/kvmarm/20260119124629.2563-1-will@kernel.org/
>
> Changes since v2 include:
>
>   * Rebased onto v7.0-rc2
>   * Rework of the way that exceptions are injected into the host,
>     building on top of Fuad's work that landed in the recent merge
>     window.
>   * Some renaming and comment additions.
>
> As before, I've pushed an updated branch with this series:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=kvm/protected-memory
>
> and the kvmtool patches are available at:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/log/?h=pkvm

For both the kvmtool patches and this series:

Tested-by: Fuad Tabba <tabba at google.com>

Thanks!
/fuad

> Cheers,
>
> Will
>
> Cc: Marc Zyngier <maz at kernel.org>
> Cc: Oliver Upton <oupton at kernel.org>
> Cc: Joey Gouly <joey.gouly at arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
> Cc: Zenghui Yu <yuzenghui at huawei.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Quentin Perret <qperret at google.com>
> Cc: Fuad Tabba <tabba at google.com>
> Cc: Vincent Donnefort <vdonnefort at google.com>
> Cc: Mostafa Saleh <smostafa at google.com>
> Cc: Alexandru Elisei <alexandru.elisei at arm.com>
>
> --->8
>
> Fuad Tabba (1):
>   KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected
>     guests
>
> Quentin Perret (1):
>   KVM: arm64: Inject SIGSEGV on illegal accesses
>
> Will Deacon (34):
>   KVM: arm64: Don't leak stage-2 page-table if VM fails to init under
>     pKVM
>   KVM: arm64: Move handle check into pkvm_pgtable_stage2_destroy_range()
>   KVM: arm64: Rename __pkvm_pgtable_stage2_unmap()
>   KVM: arm64: Don't advertise unsupported features for protected guests
>   KVM: arm64: Remove is_protected_kvm_enabled() checks from hypercalls
>   KVM: arm64: Ignore MMU notifier callbacks for protected VMs
>   KVM: arm64: Prevent unsupported memslot operations on protected VMs
>   KVM: arm64: Ignore -EAGAIN when mapping in pages for the pKVM host
>   KVM: arm64: Split teardown hypercall into two phases
>   KVM: arm64: Introduce __pkvm_host_donate_guest()
>   KVM: arm64: Hook up donation hypercall to pkvm_pgtable_stage2_map()
>   KVM: arm64: Handle aborts from protected VMs
>   KVM: arm64: Introduce __pkvm_reclaim_dying_guest_page()
>   KVM: arm64: Hook up reclaim hypercall to pkvm_pgtable_stage2_destroy()
>   KVM: arm64: Factor out pKVM host exception injection logic
>   KVM: arm64: Support translation faults in inject_host_exception()
>   KVM: arm64: Avoid pointless annotation when mapping host-owned pages
>   KVM: arm64: Generalise kvm_pgtable_stage2_set_owner()
>   KVM: arm64: Introduce host_stage2_set_owner_metadata_locked()
>   KVM: arm64: Change 'pkvm_handle_t' to u16
>   KVM: arm64: Annotate guest donations with handle and gfn in host
>     stage-2
>   KVM: arm64: Introduce hypercall to force reclaim of a protected page
>   KVM: arm64: Reclaim faulting page from pKVM in spurious fault handler
>   KVM: arm64: Return -EFAULT from VCPU_RUN on access to a poisoned pte
>   KVM: arm64: Add hvc handler at EL2 for hypercalls from protected VMs
>   KVM: arm64: Implement the MEM_SHARE hypercall for protected VMs
>   KVM: arm64: Implement the MEM_UNSHARE hypercall for protected VMs
>   KVM: arm64: Allow userspace to create protected VMs when pKVM is
>     enabled
>   KVM: arm64: Add some initial documentation for pKVM
>   KVM: arm64: Extend pKVM page ownership selftests to cover guest
>     donation
>   KVM: arm64: Register 'selftest_vm' in the VM table
>   KVM: arm64: Extend pKVM page ownership selftests to cover forced
>     reclaim
>   KVM: arm64: Extend pKVM page ownership selftests to cover guest hvcs
>   KVM: arm64: Rename PKVM_PAGE_STATE_MASK
>
>  .../admin-guide/kernel-parameters.txt         |   4 +-
>  Documentation/virt/kvm/arm/index.rst          |   1 +
>  Documentation/virt/kvm/arm/pkvm.rst           | 103 +++
>  arch/arm64/include/asm/kvm_asm.h              |  31 +-
>  arch/arm64/include/asm/kvm_host.h             |   9 +-
>  arch/arm64/include/asm/kvm_pgtable.h          |  45 +-
>  arch/arm64/include/asm/kvm_pkvm.h             |   4 +-
>  arch/arm64/include/asm/virt.h                 |   9 +
>  arch/arm64/kvm/Kconfig                        |  10 +
>  arch/arm64/kvm/arm.c                          |  12 +-
>  arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |   9 +
>  arch/arm64/kvm/hyp/include/nvhe/memory.h      |  12 +-
>  arch/arm64/kvm/hyp/include/nvhe/pkvm.h        |   7 +-
>  .../arm64/kvm/hyp/include/nvhe/trap_handler.h |   2 +
>  arch/arm64/kvm/hyp/nvhe/hyp-main.c            | 184 +++---
>  arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 585 ++++++++++++++++--
>  arch/arm64/kvm/hyp/nvhe/pkvm.c                | 224 ++++++-
>  arch/arm64/kvm/hyp/nvhe/switch.c              |   1 +
>  arch/arm64/kvm/hyp/nvhe/sys_regs.c            |   8 +
>  arch/arm64/kvm/hyp/pgtable.c                  |  33 +-
>  arch/arm64/kvm/mmu.c                          | 114 +++-
>  arch/arm64/kvm/pkvm.c                         | 154 ++++-
>  arch/arm64/mm/fault.c                         |  33 +-
>  include/uapi/linux/kvm.h                      |   5 +
>  24 files changed, 1374 insertions(+), 225 deletions(-)
>  create mode 100644 Documentation/virt/kvm/arm/pkvm.rst
>
> --
> 2.53.0.473.g4a7958ca14-goog
>