linux-kernel - Re: [RFT PATCH v3 09/21] x86/sev: Pass SVSM calling area down to early page state change API

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Message-ID: <CAMj1kXE_aQm7w05Mck0umYzA8uH+fPb_FoJjO3XyB5NdznveeQ@mail.gmail.com>
Date: Tue, 13 May 2025 14:58:13 +0100
From: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org, x86@...nel.org, 
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>, 
	Dionna Amalie Glaze <dionnaglaze@...gle.com>, Kevin Loughlin <kevinloughlin@...gle.com>, 
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFT PATCH v3 09/21] x86/sev: Pass SVSM calling area down to
 early page state change API

On Tue, 13 May 2025 at 14:55, Ard Biesheuvel <ardb@...nel.org> wrote:
>
> On Mon, 12 May 2025 at 20:11, Ard Biesheuvel <ardb+git@...gle.com> wrote:
> >
> > From: Ard Biesheuvel <ardb@...nel.org>
> >
> > The early page state change API is mostly only used very early, when
> > only the boot time SVSM calling area is in use. However, this API is
> > also called by the kexec finishing code, which runs very late, and
> > potentially from a different CPU (which uses a different calling area).
> >
> > To avoid pulling the per-CPU SVSM calling area pointers and related SEV
> > state into the startup code, refactor the page state change API so the
> > SVSM calling area virtual and physical addresses can be provided by the
> > caller.
> >
> > No functional change intended.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
>
> This patch is broken - I'll send a followup fix asap.

... or actually, the one before it.