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Date:   Mon, 1 Nov 2021 17:10:25 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     Eric Biederman <ebiederm@xmission.com>
Cc:     Joerg Roedel <joro@8bytes.org>, x86@kernel.org,
        kexec@lists.infradead.org, Joerg Roedel <jroedel@suse.de>,
        stable@vger.kernel.org, hpa@zytor.com,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Jiri Slaby <jslaby@suse.cz>,
        Dan Williams <dan.j.williams@intel.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Juergen Gross <jgross@suse.com>,
        Kees Cook <keescook@chromium.org>,
        David Rientjes <rientjes@google.com>,
        Cfir Cohen <cfir@google.com>,
        Erdem Aktas <erdemaktas@google.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Mike Stunes <mstunes@vmware.com>,
        Sean Christopherson <seanjc@google.com>,
        Martin Radev <martin.b.radev@gmail.com>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v2 01/12] kexec: Allow architecture code to opt-out at
 runtime
Message-ID: <YYARccITlowHABg1@zn.tnic>
References: <20210913155603.28383-1-joro@8bytes.org>
 <20210913155603.28383-2-joro@8bytes.org>
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On Mon, Sep 13, 2021 at 05:55:52PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
> 
> Allow a runtime opt-out of kexec support for architecture code in case
> the kernel is running in an environment where kexec is not properly
> supported yet.
> 
> This will be used on x86 when the kernel is running as an SEV-ES
> guest. SEV-ES guests need special handling for kexec to hand over all
> CPUs to the new kernel. This requires special hypervisor support and
> handling code in the guest which is not yet implemented.
> 
> Cc: stable@vger.kernel.org # v5.10+
> Signed-off-by: Joerg Roedel <jroedel@suse.de>
> ---
>  include/linux/kexec.h |  1 +
>  kernel/kexec.c        | 14 ++++++++++++++
>  kernel/kexec_file.c   |  9 +++++++++
>  3 files changed, 24 insertions(+)

I guess I can take this through the tip tree along with the next one.

Eric?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette