Keep the old limit of 288 for machine versions 7.2 and earlier. Signed-off-by: Dario Faggioli <dfaggi...@suse.com> --- Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Richard Henderson <richard.hender...@linaro.org> Cc: Eduardo Habkost <edua...@habkost.net> Cc: "Michael S. Tsirkin" <m...@redhat.com> Cc: Marcel Apfelbaum <marcel.apfelb...@gmail.com> --- This is related to:
https://lore.kernel.org/qemu-devel/c705d0d8d6ed1a520b1ff92cb2f83fef19522d30.ca...@suse.com/ With this applied to QEMU, I've been able to start a VM with as high as 980 vCPUs (even if I was on an host with 384 pCPUs, so everything was super slow!). After that, I started to see messages like this: "SMBIOS 2.1 table length 66822 exceeds 65535" Thanks and Regards --- hw/i386/pc_q35.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index a496bd6e74..d2a567a71f 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -367,7 +367,7 @@ 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_7_2_machine_options(MachineClass *m) @@ -386,6 +386,7 @@ static void pc_q35_7_1_machine_options(MachineClass *m) PCMachineClass *pcmc = PC_MACHINE_CLASS(m); pc_q35_7_2_machine_options(m); m->alias = NULL; + m->max_cpus = 288; pcmc->legacy_no_rng_seed = true; compat_props_add(m->compat_props, hw_compat_7_1, hw_compat_7_1_len); compat_props_add(m->compat_props, pc_compat_7_1, pc_compat_7_1_len);
