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b=HFXCtq6w+mRp28UZlsi+f4x5O7pKgqmMZr2OFm9pfkN2dlxgmXmR4ZTpn3c3mxiCvHY40/baZX35WNQfdmiOJ+PM/eLbnySYXxeiqKTwaxPXR4LDUMHrqeFn7EahXvm19E82cg8kvwJrvzecN8m5utA5SII4aaNs5F9YqsWz8YE= 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 IA0PR12MB7578.namprd12.prod.outlook.com (2603:10b6:208:43d::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.270.17; Mon, 3 Aug 2026 18:56:28 +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 15.21.0270.017; Mon, 3 Aug 2026 18:56:28 +0000 Message-ID: <748785f1-f176-4f0a-8b8d-eadf46b20960@amd.com> Date: Mon, 3 Aug 2026 13:56:23 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 4/6] x86/sev: Add support to perform RMP optimizations asynchronously From: "Kalra, Ashish" To: Borislav Petkov 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, KPrateek.Nayak@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: <7f582569acea933c3045be604a81975e29b5ee2b.1784844080.git.ashish.kalra@amd.com> <20260731054425.GNamw2OelKuNhVwnrU@fat_crate.local> Content-Language: en-US Autocrypt: addr=ashish.kalra@amd.com; 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>>> + this_cpu = smp_processor_id(); >>> + >>> + cpumask_andnot(follower_mask, rmpopt_cpumask, >>> + topology_sibling_cpumask(this_cpu)); >>> + >>> + for (pa = rmpopt_pa_start; pa < rmpopt_pa_end; pa += SZ_1G) >>> + rmpopt(pa); >>> + >>> + migrate_enable(); >>> + >>> + /* >>> + * Followers: run RMPOPT on the remaining cores. cpus_read_lock() is >>> + * intentionally not held here: CPU hotplug is disabled for the entire >>> + * time SNP is active (see snp_prepare()), and this work only runs while >>> + * SNP is active, so the follower set stays valid across the whole scan. >>> + */ >>> + for (pa = rmpopt_pa_start; pa < rmpopt_pa_end; pa += SZ_1G) >>> + on_each_cpu_mask(follower_mask, rmpopt_smp, (void *)pa, true); >> >> An IPI per 1G pa?!?!? On each CPU?! >> >> Instead of IPIing each CPU and inside the handler, doing the loop? >> >> Nope. >> > > You're right — an IPI per 1 GB is far too many. Will restructure to a single IPI per follower core: a new on_each_cpu() > callback can loop over the whole range on the CPU it runs on. The leader will call it directly (migrate-disabled) to populate > the RMP scan cache, then one on_each_cpu_mask() will run it on the remaining cores. > > This will also fold nicely with the earlier cleanup: __rmpopt() getting merged into rmpopt(). > > One important tradeoff to be aware of: each follower IPI handler will now run a 2048-iteration loop with IRQs disabled — > but followers are RMP-scan cache hits (the leader populated the cache), so each rmpopt() there is cheap, and this only runs > at setup and guest-teardown re-optimization time. > Following up again on the tradeoff above. Referencing your point about not IPIing per 1 GB, two ways to run the follower scan (followers = primary threads only, one per core, so ~half the logical CPUs — not every CPU): A) Loop on the worker, IPI per 1 GB: loop is preemptible / IRQs on, only a single op per IPI runs IRQs-off — but 2048 IPIs per follower. B) One IPI per core, loop in the handler: a single IPI per follower, but the whole ~2048-iteration loop runs non-preemptible with IRQs disabled. Followers are RMP-scan cache hits (cheap) and this only runs at setup/teardown, so I'm leaning toward (B) — but it does mean a bounded non-preemptible/IRQ-off window per core. If you'd rather keep it preemptible, I can run the per-core loop as per-CPU work instead. Which do you prefer? Thanks, Ashish