Hello all, I'm booting a CentOS kernel under today's KVM git and it hangs after initializing the serial port when the drive if=virtio, but not when drive if=ide. Look close---this is not a "forgot to add virtio_blk" problem. If I use 0.12.3 from Ubuntu 10.04 it works properly. Reproduction: Using kvm 0.12.3 on ubuntu 10.04 (1:84+dfsg-0ubuntu16+0.12.3+noroms +0ubuntu9) it will work properly: qemu-system-x86_64 -drive file=dummy-disk-image,if=virtio \ -kernel vmlinuz-2.6.18-194.3.1.el5.centos.plus As expected, the kernel panics unable to mount root (good-boot.png). This makes sense, as "dummy-disk-image" is 1MB of 0x00 bytes. ---However---if I use today's git (2010-07-01) of kvm: /usr/local/kvm-git/bin/qemu-system-x86_64 -drive file=dummy-disk-image,if=virtio \ -kernel vmlinuz-2.6.18-194.3.1.el5.centos.plus This hangs just after initializing the Serial device (obtained by adding -serial stdio -append console=ttyS0): Note that this only happens with the disk interface set to virtio (if=virtio). It works fine for ide (if=ide). Am I doing something wrong here? Is anyone else having this problem? The pictures, disk and kernel image is available here: http://www.portlandlinuxsupport.com/src/kvm-20100701-regression/ -Eric More detail: ==== snip ==== (see also bad-boot.png) PCI: PIIX3: Enabling Passive Release on 0000:00:01.0 Activating ISA DMA hang workarounds. pci_hotplug: PCI Hot Plug PCI Core version: 0.5 Real Time Clock Driver v1.12ac Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled [[ hangs here and spins at >100% cpu ]] ==== snip ==== And the qemu-system-x86_64 process spins at >100% cpu: == snip from top == PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 8895 root 20 0 287m 28m 3124 S 102 0.5 0:56.82 qemu-system-x86 == snip from top == -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
