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From: | Chegu Vinod |
Subject: | [Qemu-devel] Unable to enable +x2apic for the guest cpus... |
Date: | Fri, 12 Oct 2012 19:38:42 -0700 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 |
Hello, I am using a very recent upstream version of qemu.git along with kvm.git kernels (in the host and guest). [Guest kernel had been compiled with CONFIG_X86_X2APIC and CONFIG_IRQ_REMAP both set] When I attempt to start a guest with +x2apic flag (pl. see the qemu cmd line below) I end up with a hang of the qemu and a kernel BUG at /arch/x86/kvm/lapic.c:159 ! Pl. see the attached screen shot of the console for additional info. I am able to boot the same guest without the +x2apic flag in the qemu cmd line. Not sure if this an issue (or) if I have something incorrectly specified in the qemu cmd line ? If its the latter...pl. advise the correct usage for enabling x2apic for the guest cpus.. for the upstream bits. Thanks Vinod ---- /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ -machine kernel_irqchip=on \ -cpu Westmere,+rdtscp,+pdpe1gb,+dca,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pclmuldq,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme,+x2apic \ -m 786432 -smp 80,sockets=80,cores=1,threads=1 \ -name vm1 \ -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vm1.monitor,server,nowait \ -drive file=/dev/libvirt_lvm/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,macaddr=52:54:00:71:01:01 \ -net tap,ifname=tap0,script=no,downscript=no \ -vnc :4 |
kvm.JPG
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