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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2946de0fdc1sm8343475ad.48.2025.10.22.21.14.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Oct 2025 21:14:43 -0700 (PDT) Message-ID: <5a13811b-628f-4e47-86b9-fad1ab7df244@redhat.com> Date: Thu, 23 Oct 2025 14:14:27 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC V6 05/24] arm/virt,kvm: Pre-create KVM vCPUs for 'disabled' QOM vCPUs at machine init To: Salil Mehta Cc: qemu-devel@nongnu.org, qemu-arm@nongnu.org, mst@redhat.com, salil.mehta@huawei.com, maz@kernel.org, jean-philippe@linaro.org, jonathan.cameron@huawei.com, lpieralisi@kernel.org, peter.maydell@linaro.org, richard.henderson@linaro.org, imammedo@redhat.com, armbru@redhat.com, andrew.jones@linux.dev, david@redhat.com, philmd@linaro.org, eric.auger@redhat.com, will@kernel.org, ardb@kernel.org, oliver.upton@linux.dev, pbonzini@redhat.com, rafael@kernel.org, borntraeger@linux.ibm.com, alex.bennee@linaro.org, gustavo.romero@linaro.org, npiggin@gmail.com, harshpb@linux.ibm.com, linux@armlinux.org.uk, darren@os.amperecomputing.com, ilkka@os.amperecomputing.com, vishnu@os.amperecomputing.com, gankulkarni@os.amperecomputing.com, karl.heubaum@oracle.com, miguel.luis@oracle.com, zhukeqian1@huawei.com, wangxiongfeng2@huawei.com, wangyanan55@huawei.com, wangzhou1@hisilicon.com, linuxarm@huawei.com, jiakernel2@gmail.com, maobibo@loongson.cn, lixianglai@loongson.cn, shahuang@redhat.com, zhao1.liu@intel.com, Keqian Zhu References: <20251001010127.3092631-1-salil.mehta@opnsrc.net> <20251001010127.3092631-6-salil.mehta@opnsrc.net> From: Gavin Shan In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Vl9sMhzONCwKP4OO-J86AtvKVFSTYmPJlSqQw0clHJE_1761192885 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=gshan@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Hi Salil, On 10/23/25 11:29 AM, Salil Mehta wrote: [...] >> >> Ah, I see. I think I understand the issue. It's complaining >> about calling the finalize twice. Is it possible to check as >> I do not have a way to test it? >> >> >> int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature) >> { >> switch (feature) { >> case KVM_ARM_VCPU_SVE: >> [...] >> if (kvm_arm_vcpu_sve_finalized(vcpu)) >> return -EPERM;-----> this where it must be popping? >> [...] >> } > > I've pushed the fix to avoid calling the finalizing SVE > feature (KVM_ARM_VCPU_FINALIZE) twice on the > same RFC-V6.2 branch. > > May I kindly request you to validate the fix again and > check SVE works on NVIDIA grace-hopper? > With the latest rfc-v6.2 branch, I don't hit the issue. The vCPU can be hot added and removed on grace-hopper host. host$ /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \ -accel kvm -machine virt,gic-version=host,nvdimm=on \ -cpu host,sve=on \ -smp maxcpus=4,cpus=2,disabledcpus=2,sockets=2,clusters=2,cores=1,threads=1 \ -m 4096M,slots=16,maxmem=128G \ -object memory-backend-ram,id=mem0,size=2048M \ -object memory-backend-ram,id=mem1,size=2048M \ -numa node,nodeid=0,memdev=mem0,cpus=0-1 \ -numa node,nodeid=1,memdev=mem1,cpus=2-3 \ -L /home/gavin/sandbox/qemu.main/build/pc-bios \ -monitor none -serial mon:stdio -nographic -gdb tcp::6666 \ -qmp tcp:localhost:5555,server,wait=off \ -bios /home/gavin/sandbox/qemu.main/build/pc-bios/edk2-aarch64-code.fd \ -kernel /home/gavin/sandbox/linux.guest/arch/arm64/boot/Image \ -initrd /home/gavin/sandbox/images/rootfs.cpio.xz \ -append memhp_default_state=online_movable : : guest$ cd /sys/devices/system/cpu guest$ cat present enabled online 0-3 0-1 0-1 (qemu) device_set host-arm-cpu,socket-id=1,cluster-id=0,core-id=0,thread-id=0,admin-state=enable guest$ echo 1 > cpu2/online guest$ cat present enabled online 0-3 0-2 0-2 : : guest$ cd /sys/device/system/cpu guest$ cat present enabled online 0-3 0-2 0-2 (qemu) device_set host-arm-cpu,socket-id=1,cluster-id=0,core-id=0,thread-id=0,admin-state=disable guest$ cat present enabled online 0-3 0-1 0-1 Thanks, Gavin