[PATCH 3/5] x86/cfi: Add option for cfi=debug bootparam

[Kees Cook]

On Wed, Aug 27, 2025 at 12:57:53PM -0700, Nathan Chancellor wrote:
> On Mon, Aug 25, 2025 at 07:25:50AM -0700, Kees Cook wrote:
> > From: Kees Cook <kees at outflux.net>
> > 
> > Add "debug" option for "cfi=" bootparam to get details on early CFI
> > initialization steps. Standardize CFI pr_info() lines to use "CFI:"
> > prefix. Standardize "CFI: Using ..." to always report which CFI mode is
> > being used, regardless of CONFIG_FINEIBT. Document all the "cfi=" options.
> > 
> > Signed-off-by: Kees Cook <kees at outflux.net>
> 
> I am not sure if the x86 maintainers are "patch count adverse" but it
> feels like this would be a little easier to review as four separate
> patches. Every sentence in the commit message is basically its own
> change.
> 
> 1. The initial documentation for cfi= and its current values.
> 2. Standardization of pr_info() calls to use "CFI:"
> 3. Adding "CFI: Using" to __apply_fineibt()
> 4. Adding cfi=debug
> 
> Patch four would become much simpler to understand, especially with
> Peter's suggested change.

Yeah, that's entirely fair. :) I will split this up.

-- 
Kees Cook