Re: List of unaccessible x86 states

[Jan Kiszka]

Jan Kiszka wrote:
> Hi all,
> 
> as the list of yet user-unaccessible x86 states is a bit volatile ATM,
> this is an attempt to collect the precise requirements for additional
> state fields. Once everyone feels the list is complete, we can decide
> how to partition it into one ore more substates for the new
> KVM_GET/SET_VCPU_STATE interface.
> 
> What I read so far (or tried to patch already):
> 
> - nmi_masked
> - nmi_pending
> - nmi_injected
> - kvm_queued_exception (whole struct content)
> - KVM_REQ_TRIPLE_FAULT (from vcpu.requests)
> 
> Unclear points (for me) from the last discussion:
> 
> - sipi_vector
> - MCE (covered via kvm_queued_exception, or does it require more?)
> 
> Please extend or correct the list as required.
> 

Here is a wrap-up of what has been reported so far:

 - NMI
    o nmi_masked
    o nmi_pending
    o nmi_injected
 - queued exception
    o kvm_queued_exception
    o triple_fault
 - SVM
    o gif
    (Are we sure that there is really nothing more here?)
 - sipi_vector

So the next question is how to map these on substates. I'm currently
leaning towards this organization:

 - KVM_X86_VCPU_STATE_EVENTS
    o NMI states
    o pending exception
    o sipi_vector
    o pending interrupt?
      (would be redundant to kvm_sregs.interrupt_bitmap, but that struct
      may be obsoleted one day)
 - KVM_X86_VCPU_STATE_SVM
    o gif

Any concerns or better suggestions?

Jan

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