Re: [PATCH] x86: Don't add RNG seed to Linux cmdline for SEV guests

[Jason A. Donenfeld]

On Wed, Feb 8, 2023 at 12:49 PM Dov Murik <dovmurik@linux.ibm.com> wrote:
> Even if the DTB itself doesn't change and the Guest Owner could somehow add
> it to the expected cmdline to calculate the hash, the current implementation
> adds both the SetupData entry and the dtb itself to the cmdline.  The 
> SetupData
> entry contains pointers which may be harder to predict (even though currently
> I assume that .next=0 and the rest are known, so it should be possible (but 
> ugly)).

No, setup_data isn't even hooked up under SEV. That part is skipped already.