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Documentation: document the ABI changes for KVM_CAP_ARM_MTE 

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
This commit is contained in:
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. tags as appropriate if the VM is migrated.
When this capability is enabled all memory in memslots must be mapped as 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_ANONYMOUS`` or with a RAM-based file mapping (``tmpfs``, ``memfd``),
MAP_SHARED mmap will result in an -EINVAL return. 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 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. perform a bulk copy of tags to/from the guest.