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Subject[PATCH v8 0/5] MTE support for KVM guest
Date
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

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