* Ingo Molnar <mi...@kernel.org> wrote:
>
> * Linus Torvalds <torva...@linux-foundation.org> wrote:
>
> > On Aug 6, 2015 10:15 AM, "Ingo Molnar" <mi...@kernel.org> wrote:
> > >
> > > What sense does it make to have a blob we don't know the exact layout of?
> > > How
> > > will debuggers or user-space in general be able to print (and change) the
> > > register values if they don't know the layout?
> >
> > The usage model is that you only use this for saving and restoring state.
> >
> > If you look at the state, you restore the state and then you look at the
> > registers. You never look at the blob itself.
>
> So we are relying on the saved structure already in a couple of cases, such
> as MPX
> exception handling:
>
> /*
> * We need to look at BNDSTATUS to resolve this exception.
> * A NULL here might mean that it is in its 'init state',
> * which is all zeros which indicates MPX was not
> * responsible for the exception.
> */
> bndcsr = get_xsave_field_ptr(XSTATE_BNDCSR);
> if (!bndcsr)
> goto exit_trap;
>
> trace_bounds_exception_mpx(bndcsr);
>
> get_xsave_field_ptr() very much knows about the structure.
Correction:
get_xsave_field_ptr() users very much know about the structure.
Thanks,
Ingo
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