Re: [Qemu-devel] Running KVM guest on X86

[Gleb Natapov <gleb@redhat.com>]

On Fri, Aug 10, 2012 at 08:19:49AM +0000, Bhushan Bharat-R65777 wrote:
> > > > >> On Mon, 2012-08-06 at 15:40 +0000, Bhushan Bharat-R65777 wrote:
> > > > >> > Hi Avi/All,
> > > > >> >
> > > > >> > I am facing issue to boot KVM guest on x86 (I used to work on
> > > > >> > PowerPC platform
> > > > >> and do not have enough knowledge of x86). I am working on making
> > > > >> VFIO working on PowerPC Booke, So I have cloned Alex Williamsons
> > > > >> git repository, compiled kernel for x86 on fedora with
> > > > >> virtualization configuration (selected all kernel config options
> > > > >> for same). Run below command to boot Guest (I have not provided vfio
> > device yet):
> > > > >> >
> > > > >> > "qemu-system-x86_64 -enable-kvm -m 1024 -nographic -kernel
> > > > >> arch/x86_64/boot/bzImage -initrd /boot/initramfs-3.5.0-rc4+.img
> > > > >> -serial tcp::4444,server,telnet"
> > > > >> >
> > > > >> > After the I can see qemu command line (able to run various
> > > > >> > commands like "info
> > > > >> registers" etc), while guest does not boot (not even the first print
> > comes).
> > > > >> >
> > > > >> > Can anyone help in what I am missing or doing wrong?
> > > > >>
> > > > >> x86 doesn't use the serial port for console by default, so you're
> > > > >> making things quite a bit more difficult that way.  Typically
> > > > >> you'll want to provide a disk image (the -hda option is the
> > > > >> easiest way to do this), a display (-vga std -vnc :0 is again
> > > > >> easiest), and probably something to install from (-cdrom
> > > > >> <image.iso>).  You can also add a -boot d to get it to choose the cdrom
> > the first time for install.
> > > > >> Thanks,
> > > > >
> > > > > Thanks Avi and Alex, I can see the KVM guest boot prints by adding
> > > > > -append
> > > > "console=ttyS0"
> > > >
> > > > Note, once you get to user space you will need a getty specified in
> > > > inittab in order to get a login on your serial port.   Something like:
> > > >
> > > >    T0:23:respawn:/sbin/getty -L ttyS0
> > >
> > > 1)
> > > I tried booting with prebuilt qcow2 then it works for me:
> > > qemu-system-x86_64  -enable-kvm  -nographic  -device sga  -m 1024 -hda
> > > debian_squeeze_amd64_standard.qcow2
> > >
> > > Does anyone help on how I can add my kernel to qcow2? Or create a proper
> > qcow2?
> > >
> > > 2)
> > > Also I tried as mentioned in section "3.9 Direct Linux Boot":
> > http://qemu.weilnetz.de/qemu-doc.html#disk_005fimages :
> > >
> > > qemu-kvm  -enable-kvm  -nographic -kernel /boot/vmlinuz-3.5.0+ -hda
> > > /boot/initramfs-3.5.0+.img  -append "console=ttyS0 root=/dev/sda" -m
> > > 1024
> > >
> > -hda  /boot/initramfs-3.5.0+.img is incorrect. Should be -hda
> > debian_squeeze_amd64_standard.qcow2 -initrd /boot/initramfs-3.5.0+.img and
> > root=/dev/sda1 probably.
> 
> I tried :
> qemu-system-x86_64  -enable-kvm  -nographic  -kernel /boot/vmlinuz-3.5.0+  -initrd /boot/initramfs-3.5.0+.img  -append "root=/dev/sda1 rw console=ttyS0" -m 1024 -hda debian_squeeze_amd64_standard.qcow2
> 
> With this I get the login prompt, but it is not taking input character from keyboard properly (not able to give login credentials even). Seeing some weird behavior, like sometimes it treat normal character as like ENTER pressed.
> 
See other email in this thread about getty config. It would be simple
for you to not use -nographic.

--
			Gleb.