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[Qemu-devel] [Bug 530077] Re: kvm: 16-bit code execution failure should

From: Thomas Huth
Subject: [Qemu-devel] [Bug 530077] Re: kvm: 16-bit code execution failure should be more friendly
Date: Mon, 13 Nov 2017 09:29:47 -0000

Triaging old bug tickets... has this ever been fixed, thus could we
close this ticket nowadays? Or is there something left to do here?

** Changed in: qemu
       Status: Confirmed => Incomplete

** Changed in: qemu
     Assignee: Anthony Liguori (anthony-codemonkey) => (unassigned)

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  kvm: 16-bit code execution failure should be more friendly

Status in QEMU:

Bug description:
  Today, when kvm fails at 16-bit code execution, we report:

       spirit:~/qemu> qemu-kvm ./hda-fedora.img 
       kvm: unhandled exit 80000021
       kvm_run returned -22

  There are three reasons exit reason 21 happens.  The first is that a
  user is executing an image containing a workload that uses GFXBOOT or
  some other bootloader that exercises big real mode.  On pre-Westmere
  Intel processors, VT could not handle big real mode.  The second
  reason is that the guest's image is corrupted and we're executing
  random code.  We accidentally fall into one of the unsupported modes
  for VT.  Again, this is addressed on WSM.  The third case is where
  there's an actual bug in KVM.  This should be exceedingly rare at this

  We should present a friendly error message explaining the possible
  causes and recommending corrective action.

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