From: ebiederm@xmission.com (Eric W. Biederman)
To: Borislav Petkov <bp@alien8.de>
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
Date: Mon, 01 Nov 2021 16:11:42 -0500 [thread overview]
Message-ID: <87pmrjbmy9.fsf@disp2133> (raw)
In-Reply-To: <YYARccITlowHABg1@zn.tnic> (Borislav Petkov's message of "Mon, 1 Nov 2021 17:10:25 +0100")
Borislav Petkov <bp@alien8.de> writes:
> 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.
I seem to remember the consensus when this was reviewed that it was
unnecessary and there is already support for doing something like
this at a more fine grained level so we don't need a new kexec hook.
Eric
next prev parent reply other threads:[~2021-11-01 21:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 15:55 [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 01/12] kexec: Allow architecture code to opt-out at runtime Joerg Roedel
2021-11-01 16:10 ` Borislav Petkov
2021-11-01 21:11 ` Eric W. Biederman [this message]
2021-11-02 16:37 ` Joerg Roedel
2021-11-02 17:00 ` Joerg Roedel
2021-11-02 18:17 ` Eric W. Biederman
2021-11-02 17:17 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel
2021-11-03 14:27 ` Borislav Petkov
2022-01-26 9:27 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 04/12] x86/sev: Do not hardcode " Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel
2021-11-03 16:05 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 06/12] x86/sev: Cache AP Jump Table Address Joerg Roedel
2021-11-08 18:14 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 07/12] x86/sev: Setup code to park APs in the AP Jump Table Joerg Roedel
2021-11-10 16:37 ` Borislav Petkov
2022-01-26 14:26 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel
2021-11-12 16:33 ` Borislav Petkov
2022-01-27 9:01 ` Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel
2021-11-15 18:44 ` Borislav Petkov
2021-09-13 15:56 ` [PATCH v2 10/12] x86/sev: Add MMIO handling support to boot/compressed/ code Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 11/12] x86/sev: Handle CLFLUSH MMIO events Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 12/12] x86/sev: Support kexec under SEV-ES with AP Jump Table blob Joerg Roedel
2021-09-13 16:02 ` [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Dave Hansen
2021-09-13 16:14 ` Joerg Roedel
2021-09-13 16:21 ` Dave Hansen
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