linux-kernel - Re: [tip: x86/boot] x86/boot/sev: Avoid shared GHCB page for early memory acceptance

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Message-ID: <CAMj1kXGTP31w7vM+jWqpbJPmoyPU9vqOrmvXsueoPnBin0y_hQ@mail.gmail.com>
Date: Fri, 18 Apr 2025 09:12:21 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org, 
	Tom Lendacky <thomas.lendacky@....com>, Dionna Amalie Glaze <dionnaglaze@...gle.com>, 
	Kevin Loughlin <kevinloughlin@...gle.com>, 
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, linux-efi@...r.kernel.org, x86@...nel.org
Subject: Re: [tip: x86/boot] x86/boot/sev: Avoid shared GHCB page for early
 memory acceptance

On Sat, 12 Apr 2025 at 22:45, Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Ard Biesheuvel <ardb@...nel.org> wrote:
>
> > On Sat, 12 Apr 2025 at 22:29, tip-bot2 for Ard Biesheuvel
> > <tip-bot2@...utronix.de> wrote:
> > >
> > > The following commit has been merged into the x86/boot branch of tip:
> > >
> >
> > This may be slightly premature. I took some of Tom's code, hence the
> > co-developed-by, but the should really confirm that what I did is
> > correct before we queue this up.
>
> OK, I've zapped it again, especially as the rest of the series wasn't
> ready either, please include the latest version of this patch as part
> of the boot/setup/ series, which hard-relies upon it.
>

I have sent out a v4 here [0].

I am not including it in the next rev of the startup/ refactor series,
given that this change is a fix that also needs to go to stable.
Please apply it as a fix and merge back the branch into tip/x86/boot -
I will rebase the startup/ refactor series on top of that.

Thanks,

[0] https://lore.kernel.org/linux-efi/20250417202120.1002102-2-ardb+git@google.com/T/#u