On Mon, Jun 02, 2025 at 01:19:29 +0200, Hector Cao wrote: > Several Intel CPU models with TSX technology (HLE & RTM features) are > affected by the vulnerability TAA[1]. One of the mitigation methods > for TAA is to disable TSX support on the host system. For that purpose, > in 2021, Intel published a microcode update to disable TSX. Linux kernel > also disables TSX globally by default. Even though TSX can be activated via > the kernel command line (tsx=on), many Linux distributions stick with > this default behavior and have TSX disabled. This makes existing CPU > models that have HLE and RTM enabled not correctly detected by > libvirt.
Can you describe the issue in more details? Especially where libvirt incorrectly detects CPU models because of this? > This commit adds 2 remaining -noTSX models: > - SapphireRapids-noTSX > - GraniteRapids-noTSX QEMU switched away from adding suffixes to CPU models and just adds a new version for a CPU model in case it needs to be updated. There's no point adding these models to libvirt. Any CPU model that would only exist in libvirt would not be directly usable anyway and would have to be translated to another CPU model. Jirka
