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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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! To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1285708/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp