linux-kernel - [RFC PATCH v3 5/6] kvm: document KVM_GMEM_NO_DIRECT

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Message-ID: <20241030134912.515725-6-roypat@amazon.co.uk>
Date: Wed, 30 Oct 2024 13:49:09 +0000
From: Patrick Roy <roypat@...zon.co.uk>
To: <tabba@...gle.com>, <quic_eberman@...cinc.com>, <david@...hat.com>,
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CC: Patrick Roy <roypat@...zon.co.uk>, <graf@...zon.com>,
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Subject: [RFC PATCH v3 5/6] kvm: document KVM_GMEM_NO_DIRECT_MAP flag

Signed-off-by: Patrick Roy <roypat@...zon.co.uk>
---
 Documentation/virt/kvm/api.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index edc070c6e19b2..c8e21c523411c 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6382,6 +6382,20 @@ a single guest_memfd file, but the bound ranges must not overlap).
 
 See KVM_SET_USER_MEMORY_REGION2 for additional details.
 
+The following flags are defined:
+
+KVM_GMEM_NO_DIRECT_MAP
+   Ensure memory backing this guest_memfd inode is unmapped from the kernel's
+   address space.
+
+Errors:
+
+  ========== ===============================================================
+  EOPNOTSUPP `KVM_GMEM_NO_DIRECT_MAP` was set in `flags`, but the host does
+             not support direct map manipulations.
+  ========== ===============================================================
+
+
 4.143 KVM_PRE_FAULT_MEMORY
 ---------------------------
 
-- 
2.47.0