On 21/01/2026 2:28 pm, Alejandro Vallejo wrote: > Signed-off-by: Alejandro Vallejo <[email protected]> > --- > 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
