Hello, On a Westmere EX system I tried to boot a 3.10-rc1 kernel in the guest and tripped over a panic. [ 'was only able to capture part of the info. on the guest console... Pl. see the JPG file and also the qemu command line below. ] 'am using qemu (from qemu.git 1.4.91) that is about a day old. This worked fine with 3.9-rc7 kernels in the guest. I had also tried smaller guests with and without VFIO and huge pages etc...and got the same panic. Is this a known issue [or an operator error on my part] ? Thanks Vinod /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ -cpu host \ -name vm1 \ -smp sockets=8,cores=10,threads=1 \ -numa node,nodeid=0,cpus=0-9,mem=96g \ -numa node,nodeid=1,cpus=10-19,mem=96g \ -numa node,nodeid=2,cpus=20-29,mem=96g \ -numa node,nodeid=3,cpus=30-39,mem=96g \ -numa node,nodeid=4,cpus=40-49,mem=96g \ -numa node,nodeid=5,cpus=50-59,mem=96g \ -numa node,nodeid=6,cpus=60-69,mem=96g \ -numa node,nodeid=7,cpus=70-79,mem=96g \ -m 786432 \ -mem-path /dev/hugepages \ -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vm1.monitor,server,nowait \ -drive file=/dev/libvirt_lvm3/vm1,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native \ -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \ -monitor stdio \ -net nic,model=virtio,macaddr=52:54:00:71:01:01,netdev=nic-0 \ -netdev tap,id=nic-0,ifname=tap0,script=no,downscript=no,vhost=on \ -device vfio-pci,host=05:00.0,id=hostdev0 \ -device vfio-pci,host=05:00.1,id=hostdev1 \ -vnc :4