[Xen-bugs] [Bug 1779] New: pv-grub in xen-4.1.0 cannot boot kernel in graphical mode (vfb)

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1779

           Summary: pv-grub in xen-4.1.0 cannot boot kernel in graphical
                    mode (vfb)
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Linux-pv_ops domU
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: johneed@xxxxxxxxxxx


Have a gentoo64 guest made with a stable kernel 2.6.38-r6 compiled in pvops
mode.
Have adjusted the kernel config extensively.  It now boots to a console in the
host gentoo console.

#  This PV domU can be started after you finishes the installation under HVM
mode.
name        = 'gentoo64'
#  Virtual FrameBuffer + extra configuration
# vfb         = [ 'type=vnc,vncdisplay=20' ]
extra       = '(hd0,0)/grub/menu.lst console=hvc0'
kernel  = '/usr/lib64/xen/boot/pv-grub-x86_64.gz'
memory      = '1256'
disk        = [ 'file:/mnt/karmic/xen/gentoo64/disk.img,xvda,w' ]

on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
vif         = [ 'mac=e6:1b:4e:4c:d8:66, bridge=virbr0' ]

On inquiry in irc, discovered a number of past entries in xen-devel re this
flaw.

On using the vfb, the grub list is displayed in the vnc console with the entry

extra       = '(hd0,0)/grub/menu.lst console=hvc0'

in the .cfg file.  On selecting the kernel, results in either a hang (freeze)
or a reboot.  On selecting 'c' to a grub console, the kernel never is setup.
selecting root (hd0,0) yields result as expected
selecting kernel /vmlinuz-version ......
yields a blank line.  ie. the kernel is recognized by grub but is never setup
with loading a address.  On selecting 'b' to boot, it does not boot.

De-selecting the vfb entry in the .cfg file, or commenting out the vfb line,
and booting with xm create -c does get to boot it, but ofcourse is restricted
to a system console.  There is the option of installing a vnc server, but the
aim is to get pv-grub to boot as it should with vfb.

from a host console, one can acquire the following

idella@gentoo64 ~ $ sudo xm create -c PVM-gen.cfg
Using config file "/etc/xen/PVM-gen.cfg".
Started domain gentoo64 (id=82)
                               Xen Minimal OS!
  start_info: 0xc15000(VA)
    nr_pages: 0x4e800
  shared_inf: 0xbbd96000(MA)
     pt_base: 0xc18000(VA)
nr_pt_frames: 0xb
    mfn_list: 0x9a1000(VA)
   mod_start: 0x0(VA)
     mod_len: 0
       flags: 0x0
    cmd_line: (hd0,0)/grub/menu.lst console=hvc0
  stack:      0x9609e0-0x9809e0
MM: Init
      _text: 0x0(VA)
     _etext: 0x6fccf(VA)
   _erodata: 0x8a000(VA)
     _edata: 0x92c60(VA)
stack start: 0x9609e0(VA)
       _end: 0x9a0fe0(VA)
  start_pfn: c26
    max_pfn: 4e800
Mapping memory range 0x1000000 - 0x4e800000
setting 0x0-0x8a000 readonly
skipped 0x1000

    GNU GRUB  version 0.97  (1286144K lower / 0K upper memory)

       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename.  ESC at any time
         exits. ]

grubdom> root (hd0,0)                                                          
Error ENOENT when reading the backend path device/vkbd/0/backend
Thread "kbdfront" exited.

This line has a number of entries in the xen-devel archives.  They all appear
to pertain to the use of pv-grub, just as I am using.  I cannot find an entry
that offers a resolution.

Instead of hanging, it boots

grubdom> kernel /vmlinuz-2.6.38-gentoo-r6 ro console=hvc0 root=/dev/xvda2 
video=uvesafb

grubdom> boot                                                                  
close blk: backend=/local/domain/0/backend/vbd/82/51712 node=device/vbd/51712

.............................

It is still missing the line that sets up the kernel to a loading address.

So the resultant boot is absent of vnc or sdl graphical.

The host's

gentoo64 grub # uname -r
3.0.0-gentoo-amd64


I could add kernel configs and such; to keep it short, will wait for your
perusal and request for more config info.

The hypervisor is 
/boot/xen-4.1.0-rc7-pre.gz


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