This series adds support for using the Arm Memory Tagging Extensions
(MTE) in a KVM guest.
Changes since v16[1]:
- Dropped the first patch ("Handle race when synchronising tags") as
it's not KVM specific and by restricting MAP_SHARED in KVM there is
no longer a dependency.
- Change return code when creating a memslot with VM_SHARED regions to
-EFAULT (and correctly jump to out_unlock on this error case).
- Clarify documentation thanks to Catalin.
- Rebase onto v5.13-rc4.
- Add Reviewed-by tags from Catalin - thanks!
[1] https://lore.kernel.org/r/20210618132826.54670-1-steven.price%40arm.com
Steven Price (6):
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 | 18 +++--
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 | 64 ++++++++++++++++-
arch/arm64/kvm/reset.c | 4 ++
arch/arm64/kvm/sys_regs.c | 32 +++++++--
include/uapi/linux/kvm.h | 2 +
21 files changed, 419 insertions(+), 18 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_mte.h
--
2.20.1
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