linux-kernel - [PATCH v19 015/130] KVM: Document KVM_MEMORY

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Date: Mon, 26 Feb 2024 00:25:17 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com,
	isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>,
	erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>,
	Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com,
	hang.yuan@...el.com,
	tina.zhang@...el.com
Subject: [PATCH v19 015/130] KVM: Document KVM_MEMORY_MAPPING ioctl

From: Isaku Yamahata <isaku.yamahata@...el.com>

Adds documentation of KVM_MEMORY_MAPPING ioctl.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
v19:
- newly added
---
 Documentation/virt/kvm/api.rst | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 3ec0b7a455a0..667dc58f7d2f 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6323,6 +6323,34 @@ a single guest_memfd file, but the bound ranges must not overlap).
 
 See KVM_SET_USER_MEMORY_REGION2 for additional details.
 
+4.143 KVM_MEMORY_MAPPING
+------------------------
+
+:Capability: KVM_CAP_MEMORY_MAPPING
+:Architectures: none
+:Type: vcpu ioctl
+:Parameters: struct kvm_memory_mapping(in/out)
+:Returns: 0 on success, <0 on error
+
+KVM_MEMORY_MAPPING populates guest memory without running vcpu.
+
+::
+
+  struct kvm_memory_mapping {
+	__u64 base_gfn;
+	__u64 nr_pages;
+	__u64 flags;
+	__u64 source;
+  };
+
+KVM_MEMORY_MAPPING populates guest memory in the underlying mapping. If source
+is not zero and it's supported (it depends on underlying technology), the guest
+memory content is populated with the source.  If nr_pages is large, it may
+return -EAGAIN and the values (base_gfn and nr_pages. source if not zero) are
+updated to point the remaining range.
+
+The "flags" field is reserved for future extensions and must be '0'.
+
 5. The kvm_run structure
 ========================
 
-- 
2.25.1