[Qemu-devel] [Bug 1285708] Re: FreeBSD Guest crash on boot due to xsave instruction issue

[Chris J Arges]

Testing with the identified patch doesn't solve the issue, in addition
looking at the cpu flags (core2duo +xsave) this may not be a valid
configuration since xsave assumes additional features will be there
(instead of creating an older cpu model with xsave.) Therefore I believe
this is a configuration issue.

The comment above in #4 assumes your host has the correct cpu features, you can 
always run something like:
kvm -cpu host,+xsave,check   to check if are issues with the host plus 
additional features settings. In addition I've been able to use '-cpu 
SandyBridge,+xsave' and this also works.

Marking this 'Won't Fix' as there is a clear workaround (use another CPU
model), and this configuration may not be valid.

Thanks

** Changed in: linux (Ubuntu Trusty)
       Status: In Progress => Won't Fix

** Changed in: linux (Ubuntu)
       Status: Fix Released => Invalid

** Changed in: linux (Ubuntu Precise)
   Importance: Medium => Undecided

** Changed in: linux (Ubuntu Trusty)
   Importance: Medium => Undecided

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https://bugs.launchpad.net/bugs/1285708

Title:
  FreeBSD Guest crash on boot due to xsave instruction issue

Status in QEMU:
  Invalid
Status in qemu-kvm:
  New
Status in “linux” package in Ubuntu:
  Invalid
Status in “linux” source package in Precise:
  Won't Fix
Status in “linux” source package in Trusty:
  Won't Fix

Bug description:
  When trying to boot a working FreeBSD 9.1/9.2 guest on a kvm/qemu host
  with the following command:

  kvm -m 256 -cdrom FreeBSD-9.2-RELEASE-amd64-disc1.iso -drive
  file=FreeBSD-9.2-RELEASE-amd64.qcow2,if=virtio -net nic,model=virtio
  -net user -nographic -vnc :10 -enable-kvm -balloon virtio -cpu
  core2duo,+xsave

  The FreeBSD Guest will kernel crash on boot with the following error:

  panic: CPU0 does not support X87 or SSE: 0

  When launching the guest without the cpu flags, it works just fine.

  This bug has been resolved in source:
  https://lkml.org/lkml/2014/2/22/58

  Can this fix be included in Precise ASAP!

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