[PATCH] x86/sev: Fix position dependent variable references in startup code

[Borislav Petkov]

On Tue, Feb 06, 2024 at 02:22:25PM +0000, Ard Biesheuvel wrote:
> Ideally, any kernel that could reasonably be expected to work
> correctly in a SEV guest should get this. And IMHO, the state of SEV
> host support for any of its flavors is irrelevant there. But let's see
> how painful it gets working our way back. I think Kevin mentioned
> v5.10 but I haven't had a look yet how feasible that is.

Ok, I'll add Cc:stable and then you guys can sort it out when the stable
failed-to-apply messages come in.

> Yes - I cannot speak for Kevin outright but I'm sure that between him
> and me, we will be able to allocate the time and effort to make sure
> that those conflicts are resolved and the resolutions tested
> sufficiently. (With Kevin's help, I have been able to test these
> changes myself on our internal SEV infrastructure)

Sounds good.

> One slight complication is that the change currently relies on your
> patch to remove CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT, so if we
> don't want to backport that, I will have to tweak the it. Personally,
> I think it would be fine but others may feel differently.

Well, tip:x86/sev is cast in stone because the KVM folks will use it
eventually to base the KVM SNP host changes ontop so I cannot rebase.

If there's trouble backporting just holler.

Thx.

-- 
Regards/Gruss,
    Boris.

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