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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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https://bugs.launchpad.net/bugs/530077
Title:
kvm: 16-bit code execution failure should be more friendly
Status in QEMU:
Incomplete
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
stage.
We should present a friendly error message explaining the possible
causes and recommending corrective action.
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