title: QEMU Hangs At Boot Time
body: <p>Attempting to boot from a Live Linux Mint 18.4 (x64) ISO using QEMU under macOS Catalina (with patches to use hvf as hypervisor in place of kvm).
  I am able to get as far as the boot menu, but attempting to boot into the installer leaves me with a blinking cursor.
  Booting in verbose mode, I see it hangs at:</p>
  
  <blockquote>
    <p>clocksource: switched to clocksource tsc</p>
  </blockquote>
  
  <p>I have also attempted to boot a CentOS and Kali iso. The CentOS VM exits abruptly when booted in verbose mode after a flash of text too fast for me to read, whereas the Kali iso merely shows a black screen, without even a blinking cursor.</p>
  
  <p>I attempted to also boot with the notsc kernel flag enabled, this however merely caused the Mint ISO to hang at </p>
  
  <pre><code>PCI Interrupt Link [LNKB] enabled at IRQ 10
  </code></pre>
  
  <p>instead, and made no apparent difference in the case of the Kali and CentOS isos.</p>
  
  <p>I'm unsure if this is specifically an hvf issue, but any suggestions are welcome.</p>
  
  <p>These are the command parameters I am launching my VM with.</p>
  
  <pre><code>qemu-system-x86_64 \
    -m 4096 \
    -show-cursor \
    -vga virtio \
    -usb \
    --device usb-tablet \
    -enable-kvm \
    -cdrom ./linuxmint.iso \
    -drive file=./mint.qcow2,if=virtio \
    -accel hvf \
    -cpu max
  </code></pre>