linux-kernel - Re: [PATCH 0/7] x86/seves: Support 32-bit boot path and other updates

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Date:   Wed, 10 Feb 2021 10:19:38 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     daniel.kiper@...cle.com, x86@...nel.org,
        Joerg Roedel <jroedel@...e.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 0/7] x86/seves: Support 32-bit boot path and other updates

On Wed, Feb 10, 2021 at 04:12:25PM +0100, Joerg Roedel wrote:
> Hi Konrad,
> 
> On Wed, Feb 10, 2021 at 09:58:35AM -0500, Konrad Rzeszutek Wilk wrote:
> > What GRUB versions are we talking about (CC-ing Daniel Kiper, who owns
> > GRUB).
> 
> I think this was about 32-bit GRUB builds used by distributions. I
> personally tested it with a kernel which has EFI support disabled, in
> this case the OVMF firmware will also boot into the startup_32 boot
> path.

I think I am missing something obvious here - but why would you want
EFI support disabled?

Or is the idea that "legacy" OSes can nicely run under AMD SEV?
But since you are having a kernel patch that is not "legacy OS" anymore.

> 
> > By 'some firmware' we talking SeaBIOS?
> 
> No, SeaBIOS is not supported for SEV-ES, only OVMF has handling for #VC
> so far.
> 
> Regards,
> 
> 	Joerg