Messages in this thread |  | | | Date | Wed, 21 May 2008 18:38:31 -0700 | | From | "H. Peter Anvin" <> | | Subject | Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions |
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Roland McGrath wrote: >> 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.
Yes, but I suspect for legacy apps running without vDSO might matter.
-hpa
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