[Qemu-devel] [Bug 921208] Re: win7/x64 installer hangs on startup with 0x0000005d.

[Brendan Dolan-Gavitt]

The initial bluescreen is caused because of unsupported CPU feature bits
(the DE flag, specifically). The experimental patch Clemens mentioned is
here:

http://lists.gnu.org/archive/html/qemu-devel/2012-09/msg01412.html

Past that, however, there is a bug in QEMU's self-modifying code support
that causes trouble with PatchGuard and results in a different BSOD.
Patrick Hulin did some work debugging and fixing this:

http://lists.gnu.org/archive/html/qemu-devel/2014-08/msg02161.html

After that, 64-bit Windows 7 will run correctly under TCG. However it
should be noted that his patch introduces other problems – e.g., running
Paint Shop Pro 8.0 on Windows 7 32-bit will now crash on startup.

So there is no proper fix yet, but for some use cases these patches may
suffice.

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https://bugs.launchpad.net/bugs/921208

Title:
  win7/x64 installer hangs on startup with 0x0000005d.

Status in QEMU:
  Confirmed
Status in qemu package in Ubuntu:
  Triaged

Bug description:
  hi,

  during booting win7/x64 installer i'm observing a bsod with 0x0000005d
  ( msdn: unsupported_processor ).

  used command line: qemu-system-x86_64 -m 2048 -hda w7-system.img
  -cdrom win7_x64.iso -boot d

  adding '-machine accel=kvm' instead of default tcg accel helps to
  boot.

  
  installed software:

  qemu-1.0
  linux-3.2.1
  glibc-2.14.1
  gcc-4.6.2

  hw cpu:

  processor       : 0..7
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 42
  model name      : Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
  stepping        : 7
  microcode       : 0x14
  cpu MHz         : 1995.739
  cache size      : 6144 KB
  physical id     : 0
  siblings        : 8
  core id         : 3
  cpu cores       : 4
  apicid          : 7
  initial apicid  : 7
  fpu             : yes
  fpu_exception   : yes
  cpuid level     : 13
  wp              : yes
  flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 
cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave avx 
lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
  bogomips        : 3992.23
  clflush size    : 64
  cache_alignment : 64
  address sizes   : 36 bits physical, 48 bits virtual

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