I know it's likely to be the merge window next week, but since there were a couple of changes from Catalin's review I thought I'd send another version out - there are some minor conflicts with what's currently in -next so I'll rebase after -rc1. 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 v10[1]: * Replace pte_valid_user() with (pte_val(pte) & PTE_USER) in set_pte_at() as the former has been removed with the EPAN patches. * Don't attempt to check tags on memory which is going to be mapped in stage 2 as DEVICE as the guest won't be able to see the tags. * Use pfn_to_online_page() instead of pfn_to_page() in user_mem_abort() to prevent ZONE_DEVICE memory being populated in stage 2 if tags are enabled. [1] https://lore.kernel.org/r/20210312151902.17853-1-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 | 20 ++++++ arch/arm64/kvm/sys_regs.c | 28 ++++++-- include/uapi/linux/kvm.h | 2 + 16 files changed, 317 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
