Comment 8 for bug 1021649

when the guest is waiting for the keypress, it is sitting in KVM_RUN ioctl and eating 100% CPU. When enabling Seabios debugging, the last lines before the stall is this:

Returned 57344 bytes of ZoneHigh
e820 map has 7 items:
  0: 0000000000000000 - 000000000009dc00 = 1 RAM
  1: 000000000009dc00 - 00000000000a0000 = 2 RESERVED
  2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
  3: 0000000000100000 - 000000001fffe000 = 1 RAM
  4: 000000001fffe000 - 0000000020000000 = 2 RESERVED
  5: 00000000feffc000 - 00000000ff000000 = 2 RESERVED
  6: 00000000fffc0000 - 0000000100000000 = 2 RESERVED
enter handle_19:
  NULL
Booting from Hard Disk...
_

So far it only happens when "booting" from a VIRTIO hard disk. With IDE disk it boots fine.

So, in order for it to actually stall,

  qemu -machine pc,accel=kvm,kernel_irqchip=on -drive file=foo,if=virtio -nographics

is needed.

Thanks,

/mjt