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[79.242.61.58]) by smtp.gmail.com with ESMTPSA id m20sm2353656wmq.11.2021.11.16.03.11.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Nov 2021 03:11:30 -0800 (PST) Message-ID: <188faab7-1e57-2bc1-846f-9457433c2f9d@redhat.com> Date: Tue, 16 Nov 2021 12:11:29 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH v2] hw/arm/virt: Expose empty NUMA nodes through ACPI To: Igor Mammedov References: <20211027052958.280741-1-gshan@redhat.com> <20211027174028.1f16fcfb@redhat.com> <20211101094431.71e1a50a@redhat.com> <47dc3a95-ed77-6c0e-d024-27cb22c338eb@redhat.com> <20211102073948.am3p3hcqqd3cfvru@gator.home> <20211110113304.2d713d4a@redhat.com> <5180ecee-62e2-cd6f-d595-c7c29eff6039@redhat.com> <20211112142751.4807ab50@redhat.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20211112142751.4807ab50@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -48 X-Spam_score: -4.9 X-Spam_bar: ---- X-Spam_report: (-4.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.697, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-1.446, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, Andrew Jones , Gavin Shan , ehabkost@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, shan.gavin@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" >> >> Examples include exposing HBM or PMEM to the VM. Just like on real HW, >> this memory is exposed via cpu-less, special nodes. In contrast to real >> HW, the memory is hotplugged later (I don't think HW supports hotplug >> like that yet, but it might just be a matter of time). > > I suppose some of that maybe covered by GENERIC_AFFINITY entries in SRAT > some by MEMORY entries. Or nodes created dynamically like with normal > hotplug memory. > I'm certainly no SRAT expert, but seems like under VMWare something similar can happen: https://lkml.kernel.org/r/BAE95F0C-FAA7-40C6-A0D6-5049B1207A27@vmware.com "VM was powered on with 4 vCPUs (4 NUMA nodes) and 4GB memory. ACPI SRAT reports 128 possible CPUs and 128 possible NUMA nodes." Note that that discussion is about hotplugging CPUs to memory-less, hotplugged nodes. But there seems to be some way to expose possible NUMA nodes. Maybe that's via GENERIC_AFFINITY. -- Thanks, David / dhildenb