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-rw-r--r--Documentation/virt/kvm/api.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 2b52eb77e29c..5fe84f2427b5 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -1000,6 +1000,10 @@ blobs in userspace. When the guest writes the MSR, kvm copies one
page of a blob (32- or 64-bit, depending on the vcpu mode) to guest
memory.
+The MSR index must be in the range [0x40000000, 0x4fffffff], i.e. must reside
+in the range that is unofficially reserved for use by hypervisors. The min/max
+values are enumerated via KVM_XEN_MSR_MIN_INDEX and KVM_XEN_MSR_MAX_INDEX.
+
::
struct kvm_xen_hvm_config {