[PATCH v11 0/6] MTE support for KVM guest

From: Steven Price
Date: Fri Apr 16 2021 - 11:43:31 EST


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

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2.20.1