Jordan,

Commit dee9376ffc6e5522bb5e50512b521952a5421fa5 appears to break osx
smp mode (single-cpu on Mavericks seems to still work fine).

Fedora 20 and 21 live still work fine in either single- or multi-cpu
configurations.

I realize this must be an annoying bug report, since starting a qemu
osx guest requires not-yet-committed patches (e.g. Reza's pending
ahci series, and another bunch of osx specific stuff)...

For the record, my command line is:

bin/qemu-system-x86_64 -enable-kvm -m 2048 -cpu core2duo -smp 4,cores=2 \
  -machine q35 -device ide-drive,bus=ide.2,drive=MacHDD \
  -drive id=MacHDD,if=none,snapshot=on,file=./mac_10.9.img \
  -device isa-applesmc,osk="secret-smc-osk-string" \
  -netdev user,id=usr0 -device e1000-82545em,netdev=usr0,id=vnet0 \
  -usb -device usb-kbd -device usb-mouse \
  -bios OVMF.fd \
  -smbios type=0,vendor="ovmf",version="svn.16189",date="09/29/14",uefi=on \
  -debugcon file:debug.log -global isa-debugcon.iobase=0x402 \
  -monitor stdio

And it hangs right before switching to graphics mode (so probably during
apple's boot.efi) with the following message:


efiboot loaded from device: 
Acpi(PNP0A03,0)/Pci(1F|2)/SATA(2,0)/HD(Part2,SigF402FAFD-C5D8-49C3-953C-91354746C321)
boot file path:
.Loading kernel cache file
'System\Library\Caches\com.apple.kext.caches\Startup\kernelcache'.....
root device uuid is 'D3720931-EC86-377F-8606-DB54F76A1050'


To boot with PIIX instead of q35, simply

   s/-machine q35/-device ahci,id=ide/

in the command line above. Then, it reboots after logging a similar
message.


The patch in question is a one-liner adding a "StartApsStackless()"
call to UefiCpuPkg/CpuDxe/CpuMp.c, and osx obviously dislikes
*something* about the state of the APs when it finds them, but beyond
that I have no idea what might be wrong.


Jordan, if by any chance you have a hunch and would like me to test an
alternative way of doing things for qemu/osx guest compatibility, I'd
be happy to.


Otherwise, this should serve as a heads-up for Reza: now that ovmf q35
support is upstream, once your ahci patches are applied, this will be
something you'll end up running into when submitting osx patches next :)

Thanks again,
--Gabriel

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