[PATCH v3 7/7] Documentation: document the ABI changes for KVM_CAP_ARM_MTE

From: Peter Collingbourne <pcc@google.com>
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu
Cc: Peter Collingbourne <pcc@google.com>,
	Cornelia Huck <cohuck@redhat.com>,
	 Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
	 Evgenii Stepanov <eugenis@google.com>,
	kvm@vger.kernel.org,  Steven Price <steven.price@arm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>
Subject: [PATCH v3 7/7] Documentation: document the ABI changes for KVM_CAP_ARM_MTE
Date: Wed, 10 Aug 2022 12:30:33 -0700	[thread overview]
Message-ID: <20220810193033.1090251-8-pcc@google.com> (raw)
In-Reply-To: <20220810193033.1090251-1-pcc@google.com>

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

Signed-off-by: Peter Collingbourne <pcc@google.com>
---
 Documentation/virt/kvm/api.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 9788b19f9ff7..30e0c35828ef 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.
-- 
2.37.1.559.g78731f0fdb-goog


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