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Subject: Re: [PATCH v6 09/14] x86: Secure Launch SMP bringup support Content-Language: en-US To: Simon Horman Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, iommu@lists.linux-foundation.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, luto@amacapital.net, nivedita@alum.mit.edu, kanth.ghatraju@oracle.com, trenchboot-devel@googlegroups.com References: <20230504145023.835096-1-ross.philipson@oracle.com> <20230504145023.835096-10-ross.philipson@oracle.com> From: Ross Philipson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH2PR10CA0008.namprd10.prod.outlook.com (2603:10b6:610:4c::18) To BY5PR10MB3793.namprd10.prod.outlook.com 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G_olDgCwebQXrxYicBUWYgvyP4aIiJGY Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On 5/5/23 13:54, Simon Horman wrote: > On Thu, May 04, 2023 at 02:50:18PM +0000, Ross Philipson wrote: >> On Intel, the APs are left in a well documented state after TXT performs >> the late launch. Specifically they cannot have #INIT asserted on them so >> a standard startup via INIT/SIPI/SIPI cannot be performed. Instead the >> early SL stub code parked the APs in a pause/jmp loop waiting for an NMI. >> The modified SMP boot code is called for the Secure Launch case. The >> jump address for the RM piggy entry point is fixed up in the jump where >> the APs are waiting and an NMI IPI is sent to the AP. The AP vectors to >> the Secure Launch entry point in the RM piggy which mimics what the real >> mode code would do then jumps to the standard RM piggy protected mode >> entry point. >> >> Signed-off-by: Ross Philipson > > Hi Ross, > > just one minor nit on this one. Will fix, thanks. Ross > >> /* >> * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad >> * (ie clustered apic addressing mode), this is a LOGICAL apic ID. >> @@ -1132,6 +1210,13 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle, >> cpumask_clear_cpu(cpu, cpu_initialized_mask); >> smp_mb(); >> >> + /* With Intel TXT, the AP startup is totally different */ >> + if ((slaunch_get_flags() & (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) == > > nit: spaces around '|' > >> + (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) { >> + boot_error = slaunch_wakeup_cpu_from_txt(cpu, apicid); >> + goto txt_wake; >> + } From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 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BY5PR10MB3793.namprd10.prod.outlook.com (2603:10b6:a03:1f6::14) by PH8PR10MB6528.namprd10.prod.outlook.com (2603:10b6:510:228::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6363.22; Fri, 5 May 2023 19:00:01 +0000 Received: from BY5PR10MB3793.namprd10.prod.outlook.com ([fe80::a007:b0c1:5cb:329a]) by BY5PR10MB3793.namprd10.prod.outlook.com ([fe80::a007:b0c1:5cb:329a%5]) with mapi id 15.20.6363.026; Fri, 5 May 2023 19:00:01 +0000 Message-ID: <4a174baa-a60d-4d16-683d-80729f0c85af@oracle.com> Date: Fri, 5 May 2023 14:59:57 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [PATCH v6 09/14] x86: Secure Launch SMP bringup support Content-Language: en-US To: Simon Horman Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, iommu@lists.linux-foundation.org, kexec@lists.infradead.org, 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G_olDgCwebQXrxYicBUWYgvyP4aIiJGY X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230505_200030_675150_EC44DE2A X-CRM114-Status: GOOD ( 19.99 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 5/5/23 13:54, Simon Horman wrote: > On Thu, May 04, 2023 at 02:50:18PM +0000, Ross Philipson wrote: >> On Intel, the APs are left in a well documented state after TXT performs >> the late launch. Specifically they cannot have #INIT asserted on them so >> a standard startup via INIT/SIPI/SIPI cannot be performed. Instead the >> early SL stub code parked the APs in a pause/jmp loop waiting for an NMI. >> The modified SMP boot code is called for the Secure Launch case. The >> jump address for the RM piggy entry point is fixed up in the jump where >> the APs are waiting and an NMI IPI is sent to the AP. The AP vectors to >> the Secure Launch entry point in the RM piggy which mimics what the real >> mode code would do then jumps to the standard RM piggy protected mode >> entry point. >> >> Signed-off-by: Ross Philipson > > Hi Ross, > > just one minor nit on this one. Will fix, thanks. Ross > >> /* >> * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad >> * (ie clustered apic addressing mode), this is a LOGICAL apic ID. >> @@ -1132,6 +1210,13 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle, >> cpumask_clear_cpu(cpu, cpu_initialized_mask); >> smp_mb(); >> >> + /* With Intel TXT, the AP startup is totally different */ >> + if ((slaunch_get_flags() & (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) == > > nit: spaces around '|' > >> + (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) { >> + boot_error = slaunch_wakeup_cpu_from_txt(cpu, apicid); >> + goto txt_wake; >> + } _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec