Re: FAILED: patch "[PATCH] x86/sev: Make the #VC exception stacks part of the default" failed to apply to 5.15-stable tree

[Borislav Petkov <bp@suse.de>]

On Tue, Nov 16, 2021 at 12:24:01PM +0100, Greg KH wrote:
> Nope, planning ahead:
> 	$ ~/linux/stable/commit_tree/id_found_in 7fae4c24a2b8
> 	5.16-rc1 queue-4.4 queue-4.9 queue-4.14 queue-4.19 queue-5.4 queue-5.10 queue-5.14 queue-5.15
> 
> That commit is in the current -rc releases right now.

Bah, there's stuff in-flight.

> The problem with this commit is that the cc_platform_has() function is
> not present.  I thought about backporting it as well, but that seemed
> odd as I do not think that feature is in the 5.15 and older kernels,
> right?

The cc_platform_has() was a small set:

https://lore.kernel.org/r/YX%2B5ekjTbK3rhX%2BY@zn.tnic

which wants to keep all those checks confidential guests are going to do
around the code, sane. So you don't really need it but...

> Or is it ok to take the cc_platform_has() function?

... it will simplify all those backports which use it in the future. And
we will use cc_platform_has() from now on in common code.

In any case, we're going to backport it into SLE just for that reason -
so that it can ease backports and there's no kABI nightmares.

HTH.

-- 
Regards/Gruss,
    Boris.

SUSE Software Solutions Germany GmbH, GF: Ivo Totev, HRB 36809, AG Nürnberg