spapr: Allow some cases where we can't set VSMT mode in the kernel
At present if we require a vsmt mode that's not equal to the kernel's default, and the kernel doesn't let us change it (e.g. because it's an old kernel without support) then we always fail. But in fact we can cope with the kernel having a different vsmt as long as a) it's >= the actual number of vthreads/vcore (so that guest threads that are supposed to be on the same core act like it) b) it's a submultiple of the requested vsmt mode (so that guest threads spaced by the vsmt value will act like they're on different cores) Allowing this case gives us a bit more freedom to adjust the vsmt behaviour without breaking existing cases. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Tested-by: NGreg Kurz <groug@kaod.org> Reviewed-by: NGreg Kurz <groug@kaod.org>
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