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b=XgXSlqIj5YyKpMOFd5V1wBZuK68N2eEUJATaMUBcfrfQPC/1hZf9b9AYozjy8W7pcJWI1ZHjwixZC921ff6wGROHUvSkEScQKnibotB85OAwMAu8Blg3E0xAUWFCimI5mC6MPQ25q3CEmAZymXRB1jqB+gXE/DIQgG50aBLDcic= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL3PR12MB9049.namprd12.prod.outlook.com (2603:10b6:208:3b8::21) by PH7PR12MB5976.namprd12.prod.outlook.com (2603:10b6:510:1db::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.245.10; Thu, 23 Jul 2026 13:25:01 +0000 Received: from BL3PR12MB9049.namprd12.prod.outlook.com ([fe80::ae6a:9bdd:af5b:e9ad]) by BL3PR12MB9049.namprd12.prod.outlook.com ([fe80::ae6a:9bdd:af5b:e9ad%7]) with mapi id 15.21.0245.009; Thu, 23 Jul 2026 13:25:00 +0000 Message-ID: <0b471f38-8c96-4d6b-869a-44a3684ebdd7@amd.com> Date: Thu, 23 Jul 2026 08:24:56 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 2/6] x86/sev: Initialize RMPOPT configuration MSRs From: "Kalra, Ashish" To: Borislav Petkov , K Prateek Nayak Cc: tglx@kernel.org, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, peterz@infradead.org, thomas.lendacky@amd.com, herbert@gondor.apana.org.au, davem@davemloft.net, ardb@kernel.org, pbonzini@redhat.com, aik@amd.com, Michael.Roth@amd.com, Tycho.Andersen@amd.com, Nathan.Fontenot@amd.com, ackerleytng@google.com, jackyli@google.com, pgonda@google.com, rientjes@google.com, jacobhxu@google.com, xin@zytor.com, pawan.kumar.gupta@linux.intel.com, babu.moger@amd.com, dyoung@redhat.com, nikunj@amd.com, john.allen@amd.com, darwi@linutronix.de, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev References: <8518e02c46d6edf1f37a180569c708a3cfa7c413.1782841284.git.ashish.kalra@amd.com> <20260723011031.GGamFqB1i4zt4Zlsx6@fat_crate.local> <9cfe76f4-8e16-4b21-a414-126a06859489@amd.com> <20260723051422.GGamGjLhlTqRDcFlee@fat_crate.local> <5460b946-b511-4060-8951-264d17a2b21b@amd.com> Content-Language: en-US Autocrypt: addr=ashish.kalra@amd.com; 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RMPOPT >>> is simply a performance optimization for RMP checks and leaving the >>> offline cores (that will never exit idle) unoptimized should be >>> acceptable. >> >> What happens if you boot with a subset of cores, the boot flow enables RMPOPT >> and then you online the rest? >> >> Have we tried that? >> > > It can't happen here. snp_prepare() does the following, in order: > > 1. cpu_hotplug_disable() — freeze the CPU set. > 2. fail SNP init (-EOPNOTSUPP) unless every present CPU is online (cpumask_equal(cpu_online_mask, cpu_present_mask). > 3. enable SNP. > > snp_setup_rmpopt() runs only after snp_prepare() succeeds, so all present CPUs are online and stay online (hotplug is > disabled). No core's primary thread can be offline at this point. > > (The kexec path is the one exception — snp_prepare() returns early there — which I'm handling in the other thread.) > > Thanks, > Ashish > Additionally for kexec considerations: on RMPOPT-capable platforms kexec clears SnpEn (full SNP_SHUTDOWN_EX, x86_snp_shutdown=1), so snp_prepare() re-runs its cpumask_equal() all-online check on the kexec boot exactly as on a normal boot. So no kexec-specific case where RMPOPT gets set up with a partial CPU set. Thanks, Ashish