Re: [Xen-devel] Need help with qemu args debug

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 2 Mar 2012, Fantu wrote:
> Stefano Stabellini-3 wrote
> > 
> > On Wed, 29 Feb 2012, Fantu wrote:
> >> Now I search for other options, found and tried with -global
> >> qxl-vga.vram_size=4194304 but same problem...
> >> 
> >> do_spice_init: starting 0.10.1
> >> spice_server_add_interface: SPICE_INTERFACE_MIGRATION
> >> spice_server_add_interface: SPICE_INTERFACE_KEYBOARD
> >> spice_server_add_interface: SPICE_INTERFACE_MOUSE
> >> qemu: hardware error: xen: failed to populate ram at 40000000
> > 
> > You are going in the right direction but I think QXL might be doing
> > other allocations other than the main vga videoram.
> > Now that I think about it, another way around the memory allocation
> > problem would be to add "maxmem=MEMORY" in your VM config file, where
> > MEMORY is equal to the amount of memory you assign to the VM plus the
> > videram.
> > 
> > So if you have:
> > 
> > memory=1024
> > 
> > then you could try adding:
> > 
> > maxmem=1088
> > 
> With only maxmem add not work but also with videoram and high value start
> and give other error.
> With videoram=64:
> qemu: hardware error: xen: failed to populate ram at 44002000
> With videoram=128 start qemu and spice is working but system not.
> 
> The actual domU configuration files:
> ----------------------------------------------------
> name='PRECISEHVM'
> builder="hvm"
> memory=1024
> maxmem=1536
> vcpus=2
> #hap=1
> #pae=1
> #acpi=1
> #apic=1
> #nx=1
> vif=['bridge=xenbr0']
> #vfb=['vnc=1,vncunused=1,vnclisten="0.0.0.0",keymap="it"']
> disk=['/mnt/vm/disks/PRECISEHVM.disk1.xm,raw,hda,rw',
> '/dev/sr0,raw,hdb,ro,cdrom']
> boot='c'
> #xen_platform_pci=1
> device_model_version='qemu-xen'
> vnc=0
> #vncunused=1
> #vnclisten="0.0.0.0"
> #keymap="it"
> #stdvga=1
> #videoram=16
> #sdl=0
> spice=1
> spicehost='0.0.0.0'
> spiceport=6000
> spicedisable_ticketing=1
> #spicepasswd='test'
> device_model_override="/usr/lib/xen/bin/qemu-debug.sh"
> #device_model_args=["-global qxl-vga.vram_size=8388308"]
> #on_crash='preserve'
> videoram=128
> ----------------------------------------------------
> 
> Starting QEMU with: -xen-domid 45 -chardev
> socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-45,server,nowait -mon
> chardev=libxl-cmd,mode=control -name PRECISEHVM -vga qxl -spice
> port=6000,tls-port=0,addr=0.0.0.0,disable-ticketing,agent-mouse=on -boot
> order=c -smp 2,maxcpus=3 -device
> rtl8139,id=nic0,netdev=net0,mac=00:16:3e:56:77:cd -netdev
> type=tap,id=net0,ifname=tap45.0,script=no -M xenfv -m 1024 -drive
> file=/mnt/vm/disks/PRECISEHVM.disk1.xm,if=ide,index=0,media=disk,format=raw
> -drive file=/dev/sr0,if=ide,index=1,media=cdrom,format=raw
> 
> 
> The xl dmesg PRECISEHVM: 
> http://xen.1045712.n5.nabble.com/file/n5530386/xl-dmesg-PRECISEHVM
> xl-dmesg-PRECISEHVM 
> 
> Connect to domU with spice work but qemu show Boot failed: could not read
> the boot disk.
> 
> If you need more data require and I will post.

I think this might be just a disk configuration issue.
If you want to boot from the cdrom you need:

boot='dc' in the vm config file and as command line option to qemu
instead of just 'c'.

If that doesn't work, please post QEMU's logs and the output of
xenstore-ls once the VM is started.

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