On Tue, Aug 9, 2011 at 11:06 PM, Sasha Levin <[email protected]> wrote:
> On Tue, 2011-08-09 at 19:59 +0300, Avi Kivity wrote:
>> On 08/09/2011 06:33 PM, Pekka Enberg wrote:
>> > This patch updates 'kvm run' to boot to host filesystem via 9p '/bin/sh' by
>> > default:
>> >
>> > $ ./kvm run
>> > # kvm run -k ../../arch/x86/boot/bzImage -m 320 -c 2 --name guest-3462
>> > [ 0.000000] Linux version 3.1.0-rc1+ (penberg@tiger) (gcc version
>> > 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #7 SMP PREEMPT Tue Aug 9 16:39:20 EEST 2011
>> > [ 0.000000] Command line: notsc noapic noacpi pci=conf1 reboot=k
>> > panic=1 console=ttyS0 earlyprintk=serial init=/bin/sh root=/dev/vda rw
>> > root=/dev/root rootflags=rw,trans=virtio,version=9p2000.u rootfstype=9p
>> >
>> > [snip]
>> >
>> > [ 1.803261] VFS: Mounted root (9p filesystem) on device 0:13.
>> > [ 1.805153] devtmpfs: mounted
>> > [ 1.808353] Freeing unused kernel memory: 924k freed
>> > [ 1.810592] Write protecting the kernel read-only data: 12288k
>> > [ 1.816268] Freeing unused kernel memory: 632k freed
>> > [ 1.826030] Freeing unused kernel memory: 1448k freed
>> > sh: cannot set terminal process group (-1): Inappropriate ioctl for
>> > device
>> > sh: no job control in this shell
>> > sh-4.1#
>> >
>>
>> Most kernels won't have 9p built-in, so how about building a tiny initrd
>> to load the needed modules?
>>
>> btw, I get
>>
>> # ./kvm run
>> # kvm run -k ../../arch/x86/boot/bzImage -m 1728 -c 24 --name guest-10193
>> <hang>
>>
>
> This is usually the case of missing serial console support in the guest
> kernel.
>
> You can either enable these:
> CONFIG_SERIAL_8250=y
> CONFIG_SERIAL_8250_CONSOLE=y
>
> Switch to virtio console using '--console virtio', or boot into a
> graphical console using '--sdl' or '--vnc'.
Can we somehow sanely detect that the kernel doesn't support serial
console and switch to virtio console?
Pekka
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