linux-kernel - Re: [PATCH v8 00/23] efi/x86: Avoid bare metal decompressor during EFI boot

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Date:   Sun, 6 Aug 2023 12:21:36 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Evgeniy Baskov <baskov@...ras.ru>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Peter Jones <pjones@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Dave Young <dyoung@...hat.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Kees Cook <keescook@...omium.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v8 00/23] efi/x86: Avoid bare metal decompressor during
 EFI boot

On Sun, 6 Aug 2023 at 12:17, Borislav Petkov <bp@...en8.de> wrote:
>
> On Sun, Aug 06, 2023 at 12:05:25PM +0200, Ard Biesheuvel wrote:
> > I suspect this should fix the issue:
> >
> > --- a/arch/x86/kernel/head_64.S
> > +++ b/arch/x86/kernel/head_64.S
> > @@ -110,6 +110,7 @@ SYM_CODE_START_NOALIGN(startup_64)
> >          * programmed into CR3.
> >          */
> >         leaq    _text(%rip), %rdi
> > +       movq    %r15, %rsi
> >         call    __startup_64
>
> Yah, I was suspecting we're not passing boot_params properly somewhere.
> Aaand there it is.
>
> So yes, that fixes it.
>
> Lemme know when you've refreshed your branch so that I can continue
> testing.
>

https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/log/?h=x86-efistub-cleanup-v9