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

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Message-Id: <20210603132233.10004-1-joro@8bytes.org>
Date:   Thu,  3 Jun 2021 15:22:31 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Eric Biederman <ebiederm@...ssion.com>, x86@...nel.org
Cc:     Joerg Roedel <joro@...tes.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 <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: [PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

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