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Subject[PATCH v10 0/6] MTE support for KVM guest
Date
This series adds support for using the Arm Memory Tagging Extensions
(MTE) in a KVM guest.

This version is rebased on v5.12-rc2.

Changes since v9[1]:
* Check fault_status in user_mem_abort() to avoid unnecessarily
checking if tags need clearing when handling permission faults.
* The MTE CPU feature exposed is now 0b10 explicitly rather than the
host's CPU feature. This prevents problems when a newer MTE version
is supported by the host CPU.
* Add a couple of reserved u64s to struct kvm_arm_copy_mte_tags for
potential future expansion (and check they are 0 for now).
* Correctly hold slots_lock during the ioctl (rather than
embarrassingly not do any locking as before...).
* Add the structure definition to the documentation and some
improvements suggested by Peter.

[1] https://lore.kernel.org/r/20210301142315.30920-1-steven.price%40arm.com

Steven Price (6):
arm64: mte: Sync tags for pages where PTE is untagged
arm64: kvm: Introduce MTE VM feature
arm64: kvm: Save/restore MTE registers
arm64: kvm: Expose KVM_ARM_CAP_MTE
KVM: arm64: ioctl to fetch/store tags in a guest
KVM: arm64: Document MTE capability and ioctl

Documentation/virt/kvm/api.rst | 53 +++++++++++++++
arch/arm64/include/asm/kvm_emulate.h | 3 +
arch/arm64/include/asm/kvm_host.h | 9 +++
arch/arm64/include/asm/kvm_mte.h | 66 ++++++++++++++++++
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/include/asm/sysreg.h | 3 +-
arch/arm64/include/uapi/asm/kvm.h | 14 ++++
arch/arm64/kernel/asm-offsets.c | 3 +
arch/arm64/kernel/mte.c | 16 +++--
arch/arm64/kvm/arm.c | 78 ++++++++++++++++++++++
arch/arm64/kvm/hyp/entry.S | 7 ++
arch/arm64/kvm/hyp/exception.c | 3 +-
arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 21 ++++++
arch/arm64/kvm/mmu.c | 16 +++++
arch/arm64/kvm/sys_regs.c | 28 ++++++--
include/uapi/linux/kvm.h | 2 +
16 files changed, 313 insertions(+), 11 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_mte.h

--
2.20.1

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