linux-kernel - Re: [PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

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Message-ID: <YMdMgCAIYN4zOX4N@8bytes.org>
Date:   Mon, 14 Jun 2021 14:33:04 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Eric Biederman <ebiederm@...ssion.com>, x86@...nel.org
Cc:     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 <seanjc@...gle.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

Gentle ping.

On Thu, Jun 03, 2021 at 03:22:31PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Changes v1->v2:
> 
> 	- Rebased to v5.13-rc4
> 	- Add the check also to the kexec_file_load system call
> 
> Original cover letter:
> 
> Hi,
> 
> two small patches to disable kexec on x86 when running as an SEV-ES
> guest. Trying to kexec a new kernel would fail anyway because there is
> no mechanism yet to hand over the APs from the old to the new kernel.
> Supporting this needs changes in the Hypervisor and the guest kernel
> as well.
> 
> This code is currently being work on, but disable kexec in SEV-ES
> guests until it is ready.
> 
> Please review.
> 
> Regards,
> 
> 	Joerg
> 
> Joerg Roedel (2):
>   kexec: Allow architecture code to opt-out at runtime
>   x86/kexec/64: Forbid kexec when running as an SEV-ES guest
> 
>  arch/x86/kernel/machine_kexec_64.c |  8 ++++++++
>  include/linux/kexec.h              |  1 +
>  kernel/kexec.c                     | 14 ++++++++++++++
>  kernel/kexec_file.c                |  9 +++++++++
>  4 files changed, 32 insertions(+)
> 
> -- 
> 2.31.1