Firecracker now tells T2S guests that fill-buffer flush works
Brief
The template now advertises that the flush works, even on host kernels older than 6.4.
Notes
05d47d0f8ab1e5564b0cd5db680c4fd404152420 (Takahiro Itazuri). Sets FB_CLEAR in the static and custom T2S definitions. Changelog updated. Intel MMIO stale-data guidance: https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/processor-mmio-stale-data-vulnerabilities.html
No CVE in the commit. Do not invent one.
Commit 05d47d0f8ab1e5564b0cd5db680c4fd404152420