On Mon, Sep 11, 2023 at 03:38:05PM -0700, Stefano Stabellini wrote: > On Mon, 11 Sep 2023, Andrew Cooper wrote: > > Physical CPU Hotplug does not pass the bar for being anything more than > > experimental. It's absolutely not tech-preview level because the only > > demo it has had in an environment (admittedly virtual) which does > > implement the spec in a usable way demonstrates that it doesn't function. > > > > The fact no-one has noticed until now shows that the feature isn't used, > > which comes back around full circle to the fact that Intel never made it > > work and never shipped it. > > So we actually have agreement on how to move forward > > --- > SUPPORT: downgrade Physical CPU Hotplug to Experimental > > The feature is not commonly used, and we don't have hardware to test it, > not in OSSTest, not in Gitlab, and not even ad-hoc manually by community > members.
We could use QEMU to test, so it's not impossible to test, just that AFAICT there aren't (that m)any users of it. > Signed-off-by: Stefano Stabellini <[email protected]> > > diff --git a/SUPPORT.md b/SUPPORT.md > index 3461f5cf2f..02e2f6eaa8 100644 > --- a/SUPPORT.md > +++ b/SUPPORT.md > @@ -48,7 +48,7 @@ For the Cortex A77 r0p0 - r1p0, see Errata 1508412. > > ### Physical CPU Hotplug I think it would be clearer to rename this to "ACPI CPU Hotplug", as to not be confused with the late CPU bringup done by the pvshim. Thanks, Roger.
