Another round of updates following review comments from Marc (thanks!). This is rather late for v5.12, so I'll rebase again after -rc1 is out. This series adds support for using the Arm Memory Tagging Extensions (MTE) in a KVM guest. This version splits the change to the tag synchronisation out to it's own patch (patch 1), and also separates the introduction and exposing of KVM_ARM_CAP_MTE into two patches (2 and 4) to avoid a dependency problem with the save/restore patch (3). As before patch 5 is an RFC for adding a new ioctl for reading/writing tags (I would appreciate feedback!). Changes since v7[1]: * Split into hopefully more logic patches. * Save/restore of TFSRE0_EL1 is now done in C code. * Make save/restore of TFSR_EL1 conditional on the VM having MTE enabled. * Replaced register descriptions boilerplate in sys_regs.c with a new MTE_REG() macro. [1] https://lore.kernel.org/r/20210115152811.8398-1-steven.price%40arm.com Steven Price (5): 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 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 | 13 +++++ arch/arm64/kernel/asm-offsets.c | 3 + arch/arm64/kernel/mte.c | 16 ++++-- arch/arm64/kvm/arm.c | 66 ++++++++++++++++++++++ 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 + 15 files changed, 246 insertions(+), 12 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
