[Bug 1886318] Re: Qemu after v5.0.0 breaks macos guests

[Mark Cave-Ayland]

Indeed it is, but bear in mind it was QEMU 5.1 release feature freeze
this week so most developers are busy rebasing and fixing up bugs from
the resulting merge.

Given that you have already built QEMU from source, what would help
enormously is if you can do a "git bisect" between the v5.0.0 tag
(working) and your current master (not working) and provide the output
of "git bisect log" in this bug report. By identifying the individual
commit that broke your test case, it is much easier for developers to
understand the issue and propose a fix.


ATB,

Mark.

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https://bugs.launchpad.net/bugs/1886318

Title:
  Qemu after v5.0.0 breaks macos guests

Status in QEMU:
  New

Bug description:
  The Debian Sid 5.0-6 qemu-kvm package can no longer get further than
  the Clover bootloader whereas 5.0-6 and earlier worked fine.

  So I built qemu master from github and it has the same problem,
  whereas git tag v5.0.0 (or 4.2.1) does not, so something between
  v5.0.0 release and the last few days has caused the problem.

  Here's my qemu script, pretty standard macOS-Simple-KVM setup on a
  Xeon host:

  qemu-system-x86_64 \
      -enable-kvm \
      -m 4G \
      -machine q35,accel=kvm \
      -smp 4,sockets=1,cores=2,threads=2 \
      -cpu 
  
Penryn,vendor=GenuineIntel,kvm=on,+sse3,+sse4.2,+aes,+xsave,+avx,+xsaveopt,+xsavec,+xgetbv1,+avx2,+bmi2,+smep,+bmi1,+fma,+movbe,+invtsc
 
  \
      -device 
  
isa-applesmc,osk="ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
 
  \
      -smbios type=2 \
      -drive if=pflash,format=raw,readonly,file="/tmp/OVMF_CODE.fd" \
      -drive if=pflash,format=raw,file="/tmp/macos_catalina_VARS.fd" \
      -vga qxl \
      -device ich9-ahci,id=sata \
      -drive id=ESP,if=none,format=raw,file=/tmp/ESP.img \
      -device ide-hd,bus=sata.2,drive=ESP \
      -drive id=InstallMedia,format=raw,if=none,file=/tmp/BaseSystem.img \
      -device ide-hd,bus=sata.3,drive=InstallMedia \
      -drive id=SystemDisk,if=none,format=raw,file=/tmp/macos_catalina.img \
      -device ide-hd,bus=sata.4,drive=SystemDisk \
      -usb -device usb-kbd -device usb-mouse

  Perhaps something has changed in Penryn support recently, as that's
  required for macos?

  See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964247

  Also on a related note, kernel 5.6/5.7 (on Debian) hard crashes the
  host when I try GPU passthrough on macos, whereas Ubuntu20/Win10 work
  fine - as does 5.5 kernel.

  See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961676

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