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scancount=1 engine=8.12.0-2304280000 definitions=main-2306010090 X-Proofpoint-GUID: 1KHf9RS-KY_6dSa9RI3GF6UAtuMok_LV X-Proofpoint-ORIG-GUID: 1KHf9RS-KY_6dSa9RI3GF6UAtuMok_LV Received-SPF: pass client-ip=205.220.165.32; envelope-from=joao.m.martins@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 31/05/2023 23:51, Suravee Suthikulpanit wrote: > Since KVM_MAX_VCPUS is currently defined to 1024 for x86 as shown in > arch/x86/include/asm/kvm_host.h, update QEMU limits to the same number. > > In case KVM could not support the specified number of vcpus, QEMU would > return the following error message: > > qemu-system-x86_64: kvm_init_vcpu: kvm_get_vcpu failed (xxx): Invalid argument > > Signed-off-by: Suravee Suthikulpanit > --- > > Changes from V1: > (https://lore.kernel.org/all/YnkDGsIi1vFvXmiP@redhat.com/T/) > * Bump from 512 to KVM_MAX_VCPUS (per Igor's suggestion) > > Note: > From the last discussion, Daniel mentioned that SMBIO 2.1 tables might > cause overflow at approx 720 CPUs, and it might require using the > SMBIO 3.0 entry point. Also, we might need to change the default for > the x86 machine type to SMBIO 3.0. However, I do not know the status > of this. > I suspect smbios 3.0 (64-bit entry point) is already supported. With current qemu and all the smbios fixes in the last cycle, perhaps this is mainly just setting smbios_entry_point_type to SMBIOS_ENTRY_POINT_TYPE_64 if MachineState::smp::max_cpus is bigger than 720 (e.g. in pc_q35_init()?) > Thank you, > Suravee > > hw/i386/pc_q35.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c > index f02919d92c..e7dc226bd5 100644 > --- a/hw/i386/pc_q35.c > +++ b/hw/i386/pc_q35.c > @@ -370,7 +370,7 @@ static void pc_q35_machine_options(MachineClass *m) > machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE); > machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE); > machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE); > - m->max_cpus = 288; > + m->max_cpus = 1024; > } > > static void pc_q35_8_1_machine_options(MachineClass *m)