Hi, The Intel SDM says: "The launch state of a VMCS determines which VM-entry instruction should be used with that VMCS: the VMLAUNCH instruction requires a VMCS whose launch state is “clear”; the VMRESUME instruction requires a VMCS whose launch state is “launched”. A logical processor maintains a VMCS’s launch state in the corresponding VMCS region." "There are no other ways to modify the launch state of a VMCS (it cannot be modified using VMWRITE) and there is no direct way to discover it (it cannot be read using VMREAD).' According to the above description, the launch state is stored in the VMCS region, but it seems the SDM doesn't say where exactly the launch state is stored in the VMCS. For example, the VMCS data is organized into six logic groups: Guest-state area, Host-state area, VM-execution control fields, VM-exit control fields, VM-entry control fields, VM-exit information fields. However, I can't find the "launch state" in any of these fields. If it's in the VMCS region, then why can't I find it? and why it can't be discovered by VMREAD? I saw in the kvm source code a variable called launched is defined, which enables kvm to trace the launch state of the VMCS, but is this launch state really existing in the VMCS region? If so, where exactly is it? -Jidong
