Re: [PATCH v2 3/3] CHANGELOG: Note the new SVM bus-lock intercept

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 21/01/2026 2:28 pm, Alejandro Vallejo wrote:
> Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
> ---
>  CHANGELOG.md | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/CHANGELOG.md b/CHANGELOG.md
> index 53d92a2597..07c1745f22 100644
> --- a/CHANGELOG.md
> +++ b/CHANGELOG.md
> @@ -9,6 +9,9 @@ The format is based on [Keep a 
> Changelog](https://keepachangelog.com/en/1.0.0/)
>  ### Changed
>  
>  ### Added
> + - On x86:
> +     - AMD bus-lock detect, used by Xen to mitigate (by rate-limiting) the
> +       system wide impact of an HVM guest misusing atomic instructions.
>  

A little too much copy&paste from the SPR section.  This wants
unindenting by one level.

Also, this text most importantly needs to identify which hardware the
feature exists in.  I've reworked it to:

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53d92a259731..9c3bf0411ccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,10 @@ The format is based on [Keep a
Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Changed
 
 ### Added
+ - On x86:
+   - Support for Bus Lock Threshold on AMD Zen5 and later CPUs, used by
Xen to
+     mitigate (by rate-limiting) the system wide impact of an HVM guest
+     misusing atomic instructions.
 
 ### Removed
  - On x86:


The internet suggests that it's Zen5 rather than Zen4.

Also I personally put the CHANGELOG update in the commit which finally
implements the feature, rather than doing it after the fact.  This is
more helpful when git blame-ing CHANGELOG to find things.

~Andrew