Re: [Patch v3 05/14] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently

Borislav Petkov
2022-11-21T14:45:03Z

On Fri, Nov 18, 2022 at 02:55:32AM +0000, Michael Kelley (LINUX) wrote:
> But I had not thought about TDX. In the TDX case, it appears that
> sme_postprocess_startup() will not decrypt the bss_decrypted section.
> The corresponding mem_encrypt_free_decrypted_mem() is a no-op unless
> CONFIG_AMD_MEM_ENCRYPT is set. But maybe if someone builds a
> kernel image that supports both TDX and AMD encryption, it could break

sme_me_mask better be 0 on a kernel with both built in and running as a
TDX guest.

--
Regards/Gruss,
Boris.