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[v4,8/8] Documentation: document the ABI changes for KVM_CAP_ARM_MTE

Message ID 20220921035140.57513-9-pcc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: permit MAP_SHARED mappings with MTE enabled | expand

Commit Message

Peter Collingbourne Sept. 21, 2022, 3:51 a.m. UTC 
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>
---
 Documentation/virt/kvm/api.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index abd7c32126ce..7afe603567fd 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7486,8 +7486,9 @@  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.