[Bug 1894836] Re: kernel panic using hvf with CPU passthrough

[Jessica Clarke]

0f 01 f9 is RDTSCP; use -cpu host,-rdtscp to mask out the feature. KVM
couldn't pass the feature through for a while, and HVF currently can't,
though HVF should be modified to automatically hide the feature until it
can emulate it.

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https://bugs.launchpad.net/bugs/1894836

Title:
  kernel panic using hvf with CPU passthrough

Status in QEMU:
  New

Bug description:
  Host Details
  QEMU 5.1 (Homebrew)
  macOS 10.15.6 Catalina
  Late 2014 iMac
  i5-4690 @ 3.5 GHz
  8 GB RAM

  Guest Details
  Ubuntu Desktop 20.04.1 Installer ISO

  Problem
  Whenever I boot with "-accel hvf -cpu host", the Ubuntu desktop installer 
will immediately crash with a kernel panic after the initial splash screen.
  See the attached picture of the kernel panic for more details.

  Steps to recreate
  From 
https://www.jwillikers.com/posts/virtualize_ubuntu_desktop_on_macos_with_qemu/

  1. Install QEMU with Homebrew.
  $ brew install qemu

  2. Create a qcow2 disk image to which to install.
  $ qemu-img create -f qcow2 ubuntu2004.qcow2 60G

  3. Download the ISO.
  $ curl -L -o ubuntu-20.04.1-desktop-amd64.iso 
https://releases.ubuntu.com/20.04/ubuntu-20.04.1-desktop-amd64.iso

  4. Run the installer in QEMU.
  $ qemu-system-x86_64 \
    -accel hvf \
    -cpu host \
    -smp 2 \
    -m 4G \
    -usb \
    -device usb-tablet \
    -vga virtio \
    -display default,show-cursor=on \
    -device virtio-net,netdev=vmnic -netdev user,id=vmnic \
    -audiodev coreaudio,id=snd0 \
    -device ich9-intel-hda -device hda-output,audiodev=snd0 \
    -cdrom ubuntu-20.04.1-desktop-amd64.iso \
    -drive file=ubuntu2004.qcow2,if=virtio

  Workaround
  Emulating the CPU with "-cpu qemu64" does not result in a kernel panic.

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