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| author | Peter Collingbourne <pcc@google.com> | 2022-11-04 02:10:41 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-29 10:26:07 +0100 |
| commit | a4baf8d2639f24d4d31983ff67c01878e7a5393f (patch) | |
| tree | 65133fd8a6e2f143506fe64fc314fa102345cb51 /Documentation/virt | |
| parent | KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled (diff) | |
| download | linux-a4baf8d2639f24d4d31983ff67c01878e7a5393f.tar.xz linux-a4baf8d2639f24d4d31983ff67c01878e7a5393f.zip | |
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
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index eee9f857a986..b55f80dadcfe 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -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. |