Re: [PATCH v2] x86/bugs: Break down mitigations configurations

[Breno Leitao]

On Tue, Jun 20, 2023 at 05:13:27PM -0700, Pawan Gupta wrote:
> On Fri, Jun 16, 2023 at 09:48:50AM -0700, Breno Leitao wrote:
> > There is no way to disable MDS, TAA, MMIO Stale data mitigation today at
> > compilation time. These mitigations are enabled even if
> > CONFIG_SPECULATION_MITIGATIONS is unset.
> > 
> > Create a new KCONFIG option for each mitigation under
> > CONFIG_SPECULATION_MITIGATIONS that allows these
> > mitigations to be disabled by default at compilation time.
> 
> I don't think all mitigations are still controllable at build-time e.g.
> spectre_v2 eIBRS mitigation will still be deployed irrespective of the
> config.

Right. This patchset only cares about MDS, TAA and MMIO. I am more than
happy to send a new patch to also disable spectre_v2 eIBRS.