[Qemu-devel] [Bug 1535497] [NEW] Guest can not boot up when assigned more than 20 vcpus with option "-no-acpi"

[Robert Hu]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "host dmesg log"
   https://bugs.launchpad.net/bugs/1535497/+attachment/4552327/+files/dmesg.log

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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:
  New

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.

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