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Date:   Sat, 5 Aug 2023 16:40:30 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Ard Biesheuvel <ardb@kernel.org>
Cc:     linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Evgeniy Baskov <baskov@ispras.ru>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Alexey Khoroshilov <khoroshilov@ispras.ru>,
        Peter Jones <pjones@redhat.com>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Dave Young <dyoung@redhat.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        Kees Cook <keescook@chromium.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Joerg Roedel <jroedel@suse.de>
Subject: Re: [PATCH v8 00/23] efi/x86: Avoid bare metal decompressor during
 EFI boot
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References: <20230802154831.2147855-1-ardb@kernel.org>
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On Wed, Aug 02, 2023 at 05:48:08PM +0200, Ard Biesheuvel wrote:
> Update the x86 boot path to avoid the bare metal decompressor when
> booting via the EFI stub. The bare metal decompressor inherits the
> loader's 1:1 mapping of DRAM when entering in 64-bit mode, and assumes
> that all of it is mapped read/write/execute, which will no longer be the
> case on systems built to comply with recently tightened logo
> requirements (*).
> 
> Changes since v7 [10]:

My Zen1 box fails booting with those. It is related to memory encryption
because if I supply "mem_encrypt=off", it boots.

The failure is (typing it off from the video from the BMC):

/dev/root: Can't open blockdev
VFS: Cannot open root device "UUID=..."
Please append a correct "root=" boot option;
...

I'll bisect now but it is pretty clear which one is the culprit.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette