Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

[Roland McGrath]

> The biggest potential problem with this that I see is that relying on 
> CPUID can mess with certain virtualization solutions.  Another option to 
> accomplish the same thing would be to have a system call (preferrably a 
> prctl, since it is at least in theory personality-dependent) to query 
> what information is included in the fpstate data - since it will always 
> be the same for any particular kernel.

It's easy and cheap to add an indicator to the vDSO for this.


Thanks,
Roland
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