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Subject[PATCH v16 0/7] MTE support for KVM guest
Date
This series adds support for using the Arm Memory Tagging Extensions
(MTE) in a KVM guest.

This time with less BKL but hopefully no new races!

Changes since v15[1]:

- Prevent VM_SHARED mappings with an MTE-enabled VM.

- Dropped the mte_prepare_page_tags() function, sanitise_mte_tags() now
does the PG_mte_tagged dance without extra locks.

- Added a comment to sanitise_mte_tags() explaining why the apparent
race with the test/set of page->flags is safe.

- Added a sentence to kvm/api.rst explaining that VM_SHARED is not
permitted when used with MTE in a guest.

- Dropped the Reviewed-by tags on patches 3 and 7 due to the changes.

[1] https://lore.kernel.org/r/20210614090525.4338-1-steven.price%40arm.com

Steven Price (7):
arm64: mte: Handle race when synchronising tags
arm64: mte: Sync tags for pages where PTE is untagged
KVM: arm64: Introduce MTE VM feature
KVM: arm64: Save/restore MTE registers
KVM: arm64: 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 | 61 ++++++++++++++++
arch/arm64/include/asm/kvm_arm.h | 3 +-
arch/arm64/include/asm/kvm_emulate.h | 3 +
arch/arm64/include/asm/kvm_host.h | 12 ++++
arch/arm64/include/asm/kvm_mte.h | 66 +++++++++++++++++
arch/arm64/include/asm/mte-def.h | 1 +
arch/arm64/include/asm/mte.h | 4 +-
arch/arm64/include/asm/pgtable.h | 22 +++++-
arch/arm64/include/asm/sysreg.h | 3 +-
arch/arm64/include/uapi/asm/kvm.h | 11 +++
arch/arm64/kernel/asm-offsets.c | 2 +
arch/arm64/kernel/mte.c | 37 ++++++++--
arch/arm64/kvm/arm.c | 16 +++++
arch/arm64/kvm/guest.c | 82 ++++++++++++++++++++++
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 | 62 +++++++++++++++-
arch/arm64/kvm/reset.c | 3 +-
arch/arm64/kvm/sys_regs.c | 32 +++++++--
include/uapi/linux/kvm.h | 2 +
21 files changed, 432 insertions(+), 21 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_mte.h

--
2.20.1

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