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Documentation: document the ABI changes for KVM_CAP_ARM_MTE

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Document both the restriction on VM_MTE_ALLOWED mappings and
the relaxation for shared mappings.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221104011041.290951-9-pcc@google.com
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Peter Collingbourne 2022-11-03 18:10:41 -07:00 committed by Marc Zyngier
parent c911f0d468
commit a4baf8d263
1 changed files with 3 additions and 2 deletions
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Documentation/virt/kvm/api.rst
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@ -7385,8 +7385,9 @@ hibernation of the host; however the VMM needs to manually save/restore the
tags as appropriate if the VM is migrated.
When this capability is enabled all memory in memslots must be mapped as
not-shareable (no MAP_SHARED), attempts to create a memslot with a
MAP_SHARED mmap will result in an -EINVAL return.
``MAP_ANONYMOUS`` or with a RAM-based file mapping (``tmpfs``, ``memfd``),
attempts to create a memslot with an invalid mmap will result in an
-EINVAL return.
When enabled the VMM may make use of the ``KVM_ARM_MTE_COPY_TAGS`` ioctl to
perform a bulk copy of tags to/from the guest.