[Bug 1846392] Re: VCPU shutdown request with HAX

[Stefan Weil <1846392@bugs.launchpad.net>]

Thanks for testing. I think that some of those problems might be issues
of the Intel HAXM driver, so I suggest to report them at
https://github.com/intel/haxm/issues.

As stated on https://qemu.weilnetz.de/FAQ, I consider HAXM support as
experimental and suggest to try WHPX which is also experimental, but
seems to have less limitations and run more stable.

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Title:
  VCPU shutdown request with HAX

Status in QEMU:
  New

Bug description:
  In most scenarios when turning on HAX, QEMU will exit, printing "VCPU
  shutdown request" to the console.

  This is on Windows 8.1 with Intel HAXM 7.5.2.
  QEMU's -version prints v4.1.0-11789-g013a2ecf4f-dirty .
  I've used an installer from qemu.weilnetz.de.
  The host CPU is an IvyBridge i5 (mobile).

  Some miscellaneous notes (you can skip them first):
  Win10-1709-PE_Custom.iso is a custom WinPE image I had meant to test using QEMU. It is likely broken and doesn't boot at all.
  [Stuck, etc.]: I had given that image almost 2h during which the circle of dots continued to spin. I don't know if it or QEMU did anything of interest at all during that period, but this might indicate long-term stability, sort of.
  Win10_1709_German_x32.iso: Stock Win10 1709 32bit ISO I got off a German tech website. I've waited for the install screen to appear.
  TinyCore_10-1.iso: TinyCore by Core Project. A 18MB graphical Linux distribution, pretty barren by default. I've generally opened Apps there, the package manager, then shut it down again.
  On the one marked [Fx stable], I've gotten Firefox 60.8.0 ESR and visited a couple of websites. (I don't know of any available program that would try to execute exotic CPU instructions in weird combinations to do a proper test.)
  Q64 is .\qemu-system-x86_64.exe , substituted for readability (shorter lines).

  
  Invocations that QEMU seemed to handle well (without the headline error):
  Q64 -machine q35 -accel hax
  Q64 -machine q35 -cdrom \!S\Win10-1709-PE_Custom.iso
  Q64 -machine q35 -cdrom \!S\Win10-1709-PE_Custom.iso -m 4096 [Stuck, etc.]
  Q64 -machine q35 -cdrom \!S\Win10_1709_German_x32.iso -m 1920
  Q64 -machine q35 -cdrom \!S\Win10_1709_German_x32.iso -cpu max -m 256 [1]
  Q64 -machine q35 -cdrom \!S\Win10_1709_German_x32.iso -cpu max -m 512
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -cpu max -serial file:\!S\QEMU_TCL_BUG.log [2]
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax [Fx stable, s.a.]
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu Skylake-Client-IBRS
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu Icelake-Client-v1
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu Cascadelake-Server-v2
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu Broadwell-v4
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu IvyBridge-IBRS
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu coreduo
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu pentium
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu base [3]
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -cpu base [4]
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -cpu pentium
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu Icelake-Client-v1 [5]
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu Broadwell-v4 [5]
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu IvyBridge-v1 [5]
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu coreduo

  
  Then, those that made it print "VCPU shutdown request" repeatedly and quit, immediately or after a couple of seconds at most, except where noted. I put an indication of the number of messages into curly braces.
  Q64 -machine q35,accel=hax -cpu max  {many}
  Q64 -machine q35,accel=hax -cdrom \!S\Win10-1709-PE_Custom.iso
  Q64 -machine q35 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -accel hax  {very many}
  Q64 -machine q35 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -accel hax -cpu max  {very many}
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -accel hax  {just two}
  Q64 -cdrom \!S\TinyCore_10-1.iso -m 512 -accel hax -cpu max  {a couple}
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu Icelake-Client-v1 -accel hax  {two}
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu IvyBridge-v1 -accel hax  {two}
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu pentium -accel hax  {three}
  Q64 -cdrom \!S\Win10_1709_German_x32.iso -m 512 -cpu coreduo -accel hax  {a few}


  (I have rewritten a couple of commandlines to make them more uniform
  (changing the placement of parameters and using '-accel hax' instead
  of '-machine ...,accel=hax').)

  [1]: WinPE boot error, not enough RAM.
  [2]: Will cause a kernel BUG: "... \ login[892]: root login on 'tty1' \ BUG: unable to handle kernel paging request at 00010ffa \ ...". See attached file.
  [3]: Stuck after "Booting the kernel.", cursor blinks.
  [4]: Stuck at blinking console prompt, no input possible.
  [5]: According to the printout, TCG doesn't support a bunch of those processor's features that have been requested.

  PS: There should be some note highlighting that there is a strict limit on line length (or at least that's what it looks like).  I can shorten the file names further to enhance skimmability ... :/
  Also, let me know if you need anything else.

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