Can you still reproduce this issue with the latest version of QEMU? If this is a bug in seabios, have you tried to report this to seabios instead?
** Changed in: qemu Status: New => Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1535497 Title: Guest can not boot up when assigned more than 20 vcpus with option "-no-acpi" Status in QEMU: Incomplete Bug description: Environment: ------------------------------- KVM commit/branch: da3f7ca3/next Qemu commit/branch: 7b8a354d/master Host OS: RHEL7.2 ia32e Host Kernel: 4.4-rc2 Guest OS: RHEL7.2 ia32e Description: -------------------------------- When assign more than 20 vpcus with option "-no-acpi", guest can not boot up. Reproduce: ---------------- 1.qemu-system-x86_64 --enable-kvm -m 1024 -smp 20 -no-acpi -device virtio-net-pci,netdev=nic0,mac=00:16:3e:17:9b:4c -netdev tap,id=nic0,script=/etc/kvm/qemu-ifup -drive file=/root/7u2.qcow2,if=none,id=virtio-disk0 -device virtio-blk-pci,drive=virtio-disk0 Bisect show the bad commit is 9ee2e2625 of seabios. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1535497/+subscriptions