On 2013-04-16 12:19, 李春奇 <Arthur Chunqi Li> wrote: > I looked up Intel manual for VM instruction error. Error number 7 means "VM > entry with invalid control field(s)", which means in process of VM > switching some control fields are not properly configured. > > I wonder why some emulated CPUs (e.g.Nehalem) can run properly without > nested VMCS MSR support? MSRs are only switched between host (L0) and guest (L1/L2) if their value differ. That saves some cycles. Therefore, if either the guest is not using a specific MSR (due to differences in the virtual CPU feature set) or it is using it in the same way like the host, there is no switching, thus no risk to hit this unimplemented feature. Jan
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