On Thu, 2012-08-09 at 18:06 +0000, Bhushan Bharat-R65777 wrote: > > > -----Original Message----- > > From: Alex Williamson [mailto:alex.william...@redhat.com] > > Sent: Thursday, August 09, 2012 11:25 PM > > To: Bhushan Bharat-R65777 > > Cc: Stuart Yoder; qemu-devel@nongnu.org; Avi Kivity > > Subject: Re: [Qemu-devel] Running KVM guest on X86 > > > > On Thu, 2012-08-09 at 17:39 +0000, Bhushan Bharat-R65777 wrote: > > > > > > > -----Original Message----- > > > > From: Stuart Yoder [mailto:b08...@gmail.com] > > > > Sent: Thursday, August 09, 2012 8:28 PM > > > > To: Bhushan Bharat-R65777 > > > > Cc: Alex Williamson; qemu-devel@nongnu.org; Avi Kivity > > > > Subject: Re: [Qemu-devel] Running KVM guest on X86 > > > > > > > > On Tue, Aug 7, 2012 at 1:30 AM, Bhushan Bharat-R65777 > > > > <r65...@freescale.com> > > > > wrote: > > > > > > > > > > > > > > >> -----Original Message----- > > > > >> From: Alex Williamson [mailto:alex.william...@redhat.com] > > > > >> Sent: Monday, August 06, 2012 9:27 PM > > > > >> To: Bhushan Bharat-R65777 > > > > >> Cc: qemu-devel@nongnu.org; Avi Kivity > > > > >> Subject: Re: Running KVM guest on X86 > > > > >> > > > > >> 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 > > > > > > I get below error : > > > [ 1.299225] No filesystem could mount root, tried: ext3 ext2 ext4 > > > iso9660 > > > [ 1.303232] Kernel panic - not syncing: VFS: Unable to mount root fs on > > unknown-block(8,0) > > > > > > Chances are your root is a partition on /dev/sda, not the disk itself (ex. > > sda1, > > sda2)... Why exactly are you causing yourself so much pain by doing these > > direct > > boot, no VGA options instead of starting with an ISO image, installing it, > > then > > setting up a serial console if you want serial access? This may be the > > norm for > > powerpc VMs, but it's not how I think most people setup x86 VMs. Thanks, > > I have a fedora machine to which I do not have direct access (but I can > reboot remotely, have a console). So far what I was trying direct booting VM > using same initramfs and bzimage as of host, > > Alex, How I can create a ISO image with my kernel? Where I should place that > on host?
No, what I'm suggesting is to get an ISO image of the distribution you want to run on the guest and use the -cdrom <iso image> -boot d options to boot the VM from the ISO and install onto your disk image. If you want to make the process even easier, use something like virt-manager to install the guest, then use the disk image directly with qemu if you want. Thanks, Alex
