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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>,
	<seanjc@...gle.com>, <pbonzini@...hat.com>, <jthoughton@...gle.com>,
	<ackerleytng@...gle.com>, <vannapurve@...gle.com>, <rppt@...nel.org>
CC: Patrick Roy <roypat@...zon.co.uk>, <graf@...zon.com>,
	<jgowans@...zon.com>, <derekmn@...zon.com>, <kalyazin@...zon.com>,
	<xmarcalx@...zon.com>, <linux-mm@...ck.org>, <corbet@....net>,
	<catalin.marinas@....com>, <will@...nel.org>, <chenhuacai@...nel.org>,
	<kernel@...0n.name>, <paul.walmsley@...ive.com>, <palmer@...belt.com>,
	<aou@...s.berkeley.edu>, <hca@...ux.ibm.com>, <gor@...ux.ibm.com>,
	<agordeev@...ux.ibm.com>, <borntraeger@...ux.ibm.com>, <svens@...ux.ibm.com>,
	<gerald.schaefer@...ux.ibm.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	<hpa@...or.com>, <luto@...nel.org>, <peterz@...radead.org>,
	<rostedt@...dmis.org>, <mhiramat@...nel.org>,
	<mathieu.desnoyers@...icios.com>, <shuah@...nel.org>, <kvm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <loongarch@...ts.linux.dev>,
	<linux-riscv@...ts.infradead.org>, <linux-s390@...r.kernel.org>,
	<linux-trace-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
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


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