MSRs load/store

2009-12-07 Thread Jiaqing Du
Hi List, My question is about VM-Exit VM-Entry controls for MSRs on Intel's processors. For VM-Exit, a VMM can specify lists of MSRs to be stored and loaded on VM exits. But for VM-Entry, a VMM can only specify a list of MSRs to be loaded on VM entries. Why does not the processor have the

Re: MSRs load/store

2009-12-07 Thread Avi Kivity
On 12/07/2009 05:07 PM, Jiaqing Du wrote: Hi List, My question is about VM-Exit VM-Entry controls for MSRs on Intel's processors. For VM-Exit, a VMM can specify lists of MSRs to be stored and loaded on VM exits. But for VM-Entry, a VMM can only specify a list of MSRs to be loaded on VM

Re: MSRs load/store

2009-12-07 Thread Jiaqing Du
Hi Avi, I did not get your point. But if we want to multiplex some of the MSRs across the VMM and the guest(s), it would be handy if the hardware provides this feature: save host's version and load guest's version. Of course, we can do this manually. I'm just wondering why this feature is

Re: MSRs load/store

2009-12-07 Thread Avi Kivity
On 12/07/2009 05:32 PM, Jiaqing Du wrote: Hi Avi, I did not get your point. But if we want to multiplex some of the MSRs across the VMM and the guest(s), it would be handy if the hardware provides this feature: save host's version and load guest's version. Of course, we can do this manually.