linux-kernel - Re: [PATCH v7 0/9] x86: Confine early 1:1 mapped startup code

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Message-ID: <CAMj1kXH9um-r09AGk7E4h+OHGUYWxvmqGM4QBUOhAnTg3T8yOw@mail.gmail.com>
Date: Tue, 5 Mar 2024 09:46:30 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Tom Lendacky <thomas.lendacky@....com>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org, 
	Kevin Loughlin <kevinloughlin@...gle.com>, Dionna Glaze <dionnaglaze@...gle.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, 
	Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH v7 0/9] x86: Confine early 1:1 mapped startup code

On Mon, 4 Mar 2024 at 23:41, Tom Lendacky <thomas.lendacky@....com> wrote:
>
> On 3/4/24 13:13, Ard Biesheuvel wrote:
> > On Mon, 4 Mar 2024 at 18:07, Tom Lendacky <thomas.lendacky@....com> wrote:
> >>
> >> On 2/27/24 09:19, Ard Biesheuvel wrote:
> >>> From: Ard Biesheuvel <ardb@...nel.org>
> >>>
> >>> This is resend #2 of v5 [0] with some touchups applied.
> >>>
> >>> Changes since v6:
> >>> - Drop flawed patch to move some SME/SEV related calls out of the early
> >>>     boot path to avoid the potential need for backporting patches #6/#7
> >>>     to kernels where SEV support may not be crucial. This problem will be
> >>>     dealt with if/when it arises while doing those backports.
> >>>
> >>> Changes since v5:
> >>> - drop patches that have been merged
> >>> - rebase onto latest tip/x86/boot
> >>> - fix comment regarding CR4.PGE wrt flushing of global TLB entries
> >>> - avoid adding startup code to .noinstr.text as it triggers objtool
> >>>     warnings
> >>>
> >>> [0] https://lore.kernel.org/all/20240221113506.2565718-18-ardb+git@google.com/
> >>>
> >>> Cc: Kevin Loughlin <kevinloughlin@...gle.com>
> >>> Cc: Tom Lendacky <thomas.lendacky@....com>
> >>> Cc: Dionna Glaze <dionnaglaze@...gle.com>
> >>> Cc: Thomas Gleixner <tglx@...utronix.de>
> >>> Cc: Ingo Molnar <mingo@...hat.com>
> >>> Cc: Borislav Petkov <bp@...en8.de>
> >>> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> >>> Cc: Andy Lutomirski <luto@...nel.org>
> >>> Cc: Brian Gerst <brgerst@...il.com>
> >>
> >> For the series, tested bare metal boots with mem_encrypt=on /
> >> mem_encrypt=off and boots of SVM, SEV, SEV-ES and SEV-SNP guests.
> >>
> >> Tested-by: Tom Lendacky <thomas.lendacky@....com>
> >>
> >
> > Thanks a lot! I take it this was a kernel built with GCC?
>
> Yes, it was a GCC build, so I went back and rebuilt with Clang-14 and
> everything was fine there, too.
>

OK, thanks again.