I could not upgrade from Xubuntu 18.04 to Xubuntu 18.10, due to possible
demise of 32-bit support, so I have done a fresh install of Xubuntu
18.10 64-bit. Windows 10 guest will still not boot, but now I get the
BIOS flash and the Windows 10 Logo, on which it stays indefinitely with
100% cpu. Here is my qemu command:

qemu-system-x86_64 \
-name windows-10-pro \
-pidfile /tmp/windows-10-pro.pid \
-m 2047M \
-cpu host \
-smp 1 \
-enable-kvm \
-rtc clock=host,base=localtime \
-machine type=ubuntu \
-k en-us \
-drive 
file=/media/V-BOX/KVM/Win10/Win10-VM.qcow2,if=virtio,media=disk,format=qcow2,index=0
 \
-drive 
file=/media/Big_NTFS/G/Backup/KVM/Win10/Win10-VM_Backup_Disk.qcow2,if=virtio,media=disk,format=qcow2,index=1
 \
-drive 
file=/media/Shared/E/Win10-VM_Page_File.qcow2,if=virtio,media=disk,format=qcow2,index=2
 \
-usb \
-device usb-ehci,id=ehci \
-device piix3-usb-uhci \
-device usb-tablet

If I add ",hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time" to "-cpu
host" the cpu usage goes to 0-5% but still stuck on Windows 10 logo.

This command still works well on Xubuntu 16.04 32-bit (running qemu-
system-x86, of course), kernel 4.8.0-58.

Back to Xubuntu 18.10 64-bit, I can boot from xubuntu-18.10-desktop-
amd64.iso using this qemu command:

qemu-system-x86_64 \
-name xubuntu-18.10-desktop-amd64 \
-pidfile /tmp/xubuntu-18.10-desktop-amd64.pid \
-m 2047M \
-cpu host \
-smp 1 \
-enable-kvm \
-rtc clock=host,base=localtime \
-machine type=ubuntu \
-k en-us \
-boot d -cdrom /media/Shared/E/ISO/xubuntu-18.10-desktop-amd64.iso \
-usb \
-device piix3-usb-uhci \
-device usb-tablet

This leads me to believe it is a different problem than the original
post - maybe related to Windows. The same thing happens if I try
anything Windows related (WinXP Install ISO, Win10 Install ISO, WinPE
ISO, etc).

I tried virt-manager with an AOMEI Backupper WinPE ISO that I use to
backup Windows 10 guest and was able to get that to boot but no mouse
and no keyboard. When I Add Hardware > USB Host Device > Logitech MK260
Wireless Mouse/KB Combo, then run, my whole machine freezes and I have
to hard reboot. I know next to nothing about virt-manager so I don't
know how to proceed with that.

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https://bugs.launchpad.net/bugs/1767857

Title:
  Kernel 4.4.0-122 Breaks qemu-system-x86

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