I delete cdrom and IDE controller, the vm start sucessfully.

But when I increate memory to 1100G, vm hang at hpet_enable when start.

The panic is page_fault when execute   hpet_period =
hpet_readl(HPET_PERIOD);

It seems that ioremap_nocache does not works correctly.

hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);

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https://bugs.launchpad.net/bugs/1562653

Title:
  Ubuntu 15.10: QEMU VM hang if memory >= 1T

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