[Bug 1898954] [NEW] x86 f1 opcode hangs qemu

[pat leese]

Public bug reported:

I have qemu installed and running in linux and windows
in linux i execute the following simple code in real mode of cpu in my vm
90 nop
90 nop
90 nop
f1         ;this should conjure up my interrupt handler from ivt int 1
--------- end of code ----
it works properly in vbox,qemu linux,and even in my boot loder
on a real platform
   it doeas not work fine in windows 10 (32 bit efi) based qemu
---
all of the below was retyped there may be typo
so onwards to the flawed software 
********** for qemu-system-x86_64.exe **********
info version 
4.2.0v4.2.0.11797-g2890edc853-dirty
********** for qemu-system-i386.exe **********
info version 
4.2.0v4.2.0.11797-g2890edc853-dirty
***********************************************
my startup code is
"d:\programs\qemu\qemu-system-x86_64.exe" -m 16M -boot a -fda "d:\floppy.img" 
-cpu Nehalem -machine pc
---
also same flaw if i change above section to
"d:\programs\qemu\qemu-system-i386.exe"

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1898954

Title:
  x86 f1 opcode hangs qemu

Status in QEMU:
  New

Bug description:
  I have qemu installed and running in linux and windows
  in linux i execute the following simple code in real mode of cpu in my vm
  90 nop
  90 nop
  90 nop
  f1         ;this should conjure up my interrupt handler from ivt int 1
  --------- end of code ----
  it works properly in vbox,qemu linux,and even in my boot loder
  on a real platform
     it doeas not work fine in windows 10 (32 bit efi) based qemu
  ---
  all of the below was retyped there may be typo
  so onwards to the flawed software 
  ********** for qemu-system-x86_64.exe **********
  info version 
  4.2.0v4.2.0.11797-g2890edc853-dirty
  ********** for qemu-system-i386.exe **********
  info version 
  4.2.0v4.2.0.11797-g2890edc853-dirty
  ***********************************************
  my startup code is
  "d:\programs\qemu\qemu-system-x86_64.exe" -m 16M -boot a -fda "d:\floppy.img" 
-cpu Nehalem -machine pc
  ---
  also same flaw if i change above section to
  "d:\programs\qemu\qemu-system-i386.exe"

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