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 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
