Re: [XEN PATCH] x86/ACPI: Ignore entries with invalid APIC IDs when parsing MADT

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>

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
 
-    Status, x86: Supported
+    Status, x86: Experimental
 
 ### Physical Memory