Re: [Xen-devel] [PATCH 3/4 V3] X86: MPX IA32_BNDCFGS msr handle

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> >>>> Unlikely, but in case VMX support is not available, not expose
> >>>> MPX to hvm guest.
> >>> You are still missing the point.
> >>> 
> >>> I as the administrator choose to prevent an HVM guest from using
> >>> MPX. Perhaps I want to create a heterogeneous pool.
> >>> 
> >>> Therefore, the bit is disabled in the domains cpuid policy, despite
> >>> being available on the hardware.
> >>> 
> >>> ~Andrew
> >>> 
> >> Could you tell me the reason why choose to prevent HVM from using
> >> MPX? 
> >> 
> >> Thanks,
> >> Jinsong
> > 
> > For exactly the case I gave - a VM in a heterogeneous pool where one
> > server supports MPX and the other is lacking the MPX feature.
> > 
> > ~Andrew
> > 
> 
> I didn't see the point of your case to prevent HVM MPX feature.
> Could you elaborate more of your concern?

B/c the other nodes (that you migrate to) don't support the MPX and the
guest will crash when it tries to use it.

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