From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out02.mta.xmission.com (out02.mta.xmission.com [166.70.13.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 107992C86 for ; Mon, 1 Nov 2021 21:43:19 +0000 (UTC) Received: from in01.mta.xmission.com ([166.70.13.51]:44908) by out02.mta.xmission.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1mhebJ-0082VH-1q; Mon, 01 Nov 2021 15:12:17 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95]:34474 helo=email.xmission.com) by in01.mta.xmission.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1mhebH-002zh6-PG; Mon, 01 Nov 2021 15:12:16 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Borislav Petkov Cc: Joerg Roedel , x86@kernel.org, kexec@lists.infradead.org, Joerg Roedel , stable@vger.kernel.org, hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , Arvind Sankar , linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org References: <20210913155603.28383-1-joro@8bytes.org> <20210913155603.28383-2-joro@8bytes.org> Date: Mon, 01 Nov 2021 16:11:42 -0500 In-Reply-To: (Borislav Petkov's message of "Mon, 1 Nov 2021 17:10:25 +0100") Message-ID: <87pmrjbmy9.fsf@disp2133> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1mhebH-002zh6-PG;;;mid=<87pmrjbmy9.fsf@disp2133>;;;hst=in01.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1/dOcje8rMk6fFebgEu/saSTasGNFo4jXQ= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on sa08.xmission.com X-Spam-Level: ** X-Spam-Status: No, score=2.5 required=8.0 tests=ALL_TRUSTED,BAYES_50, DCC_CHECK_NEGATIVE,TR_XM_BayesUnsub,T_TM2_M_HEADER_IN_MSG, T_TooManySym_01,XMSubLong,XM_B_Unsub autolearn=disabled version=3.4.2 X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.8 BAYES_50 BODY: Bayes spam probability is 40 to 60% * [score: 0.4982] * 0.7 XMSubLong Long Subject * 0.0 T_TM2_M_HEADER_IN_MSG BODY: No description available. * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa08 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject * 0.5 XM_B_Unsub Unsubscribe in body of email but missing unsubscribe * header * 1.5 TR_XM_BayesUnsub High bayes score with no unsubscribe header X-Spam-DCC: XMission; sa08 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: **;Borislav Petkov X-Spam-Relay-Country: X-Spam-Timing: total 611 ms - load_scoreonly_sql: 0.05 (0.0%), signal_user_changed: 14 (2.3%), b_tie_ro: 12 (2.0%), parse: 0.91 (0.1%), extract_message_metadata: 17 (2.8%), get_uri_detail_list: 1.38 (0.2%), tests_pri_-1000: 11 (1.8%), tests_pri_-950: 1.41 (0.2%), tests_pri_-900: 1.43 (0.2%), tests_pri_-90: 131 (21.5%), check_bayes: 112 (18.4%), b_tokenize: 8 (1.3%), b_tok_get_all: 8 (1.3%), b_comp_prob: 2.8 (0.5%), b_tok_touch_all: 88 (14.4%), b_finish: 1.62 (0.3%), tests_pri_0: 416 (68.0%), check_dkim_signature: 0.64 (0.1%), check_dkim_adsp: 3.1 (0.5%), poll_dns_idle: 1.11 (0.2%), tests_pri_10: 3.8 (0.6%), tests_pri_500: 11 (1.8%), rewrite_mail: 0.00 (0.0%) Subject: Re: [PATCH v2 01/12] kexec: Allow architecture code to opt-out at runtime X-SA-Exim-Version: 4.2.1 (built Sat, 08 Feb 2020 21:53:50 +0000) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Borislav Petkov writes: > On Mon, Sep 13, 2021 at 05:55:52PM +0200, Joerg Roedel wrote: >> From: Joerg Roedel >> >> 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 >> --- >> 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