Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too

[Gerd Hoffmann]

>  	for_each_possible_cpu(cpu) {
>  		data = per_cpu(runtime_data, cpu);
> @@ -1066,6 +1069,14 @@ int __init sev_es_efi_map_ghcbs(pgd_t *pgd)
>  
>  		if (kernel_map_pages_in_pgd(pgd, pfn, address, 1, pflags))
>  			return 1;
> +
> +		address = per_cpu(svsm_caa_pa, cpu);
> +		if (!address)
> +			return 1;
> +
> +		pfn = address >> PAGE_SHIFT;
> +		if (kernel_map_pages_in_pgd(pgd, pfn, address, 1, pflags_enc))
> +			return 1;
>  	}

The kernel allocates the caa page(s) only when running under svsm, see
alloc_runtime_data(), so this is not correct.  I think we either have to
return to the original behavior of only doing something in case address
is not NULL, or wrap the caa code block into a 'if (snp_vmpl) { ... }',
following what alloc_runtime_data() is doing.

take care,
  Gerd