On Thu, 26 Mar 2026 11:01:20 +0100
Borislav Petkov [off-list ref] wrote:

On Thu, Mar 26, 2026 at 01:39:34AM -0700, Pawan Gupta wrote:

quoted

I believe the equivalent for cpu_feature_enabled() in asm is the
ALTERNATIVE. Please let me know if I am missing something.  

Yes, you are.

The point is that you don't want to stick those alternative calls inside some
magic bhb_loop function but hand them in from the outside, as function
arguments.

Basically what I did.

Then you were worried about this being C code and it had to be noinstr... So
that outer function can be rewritten in asm, I think, and still keep it well
separate.

I'll try to rewrite it once I get a free minute, and see how it looks.

I think someone tried getting C code to write the values to global data
and getting the asm to read them.
That got discounted because it spilt things between two largely unrelated files.

I think the BPF code would need significant refactoring to call a C function.

	David