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Re: [Xen-devel] pvgrub

To: "David P. Quigley" <dpquigl@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] pvgrub
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 02 Apr 2010 11:45:32 -0700
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On 04/02/2010 10:21 AM, David P. Quigley wrote:
So a little bit of background.

I have a vm which I know boots properly as an HVM and I want to run it
as a paravirt guest. It is a fedora 11 based image that I built from a
kickstart so I know the kernel has paravirt guest support. I have built
the latest xen-unstable tree including the stub domains to get pvgrub to
attempt to boot from. My domU config has the following lines in it.

kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd0,0)/boot/grub/menu.lst"

If I remove my storage devices from the config it boots into the grub
console so I know the stub domain is working. When I leave the the
storage devices in and boot with xm create -c<configfile>  I get the
output below and then it hangs.

Is there any additional debug information that I can grab to try to
figure this out?

Make sure your /boot is ext3, not ext4. I found that pvgrub doesn't seem to notice the "extents" feature flag, and will drop into an infinite loop if it encounters a directory with extents (probably any extent-based file will make it upset in some way).

    J

Dave

# xm create -c domU-pv.conf
/usr/lib64/python2.6/site-packages/xen/xm/group.py:23: DeprecationWarning: the 
sets module is deprecated
   from sets import Set
Using config file "./domU-pv.conf".
Started domain SEHostStorage (id=8)
                                    Xen Minimal OS!
   start_info: 0xaa6000(VA)
     nr_pages: 0x20000
   shared_inf: 0xbfa56000(MA)
      pt_base: 0xaa9000(VA)
nr_pt_frames: 0x9
     mfn_list: 0x9a6000(VA)
    mod_start: 0x0(VA)
      mod_len: 0
        flags: 0x0
     cmd_line: (hd0,0)/boot/grub/menu.lst
   stack:      0x965980-0x985980
MM: Init
       _text: 0x0(VA)
      _etext: 0x69774(VA)
    _erodata: 0x8f000(VA)
      _edata: 0x97ae0(VA)
stack start: 0x965980(VA)
        _end: 0x9a5f88(VA)
   start_pfn: ab5
     max_pfn: 20000
Mapping memory range 0xc00000 - 0x20000000
setting 0x0-0x8f000 readonly
skipped 0x1000
MM: Initialise page allocator for baf000(baf000)-20000000(20000000)
MM: done
Demand map pfns at 20001000-2020001000.
Heap resides at 2020002000-4020002000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0x20001000.
Initialising scheduler
Thread "Idle": pointer: 0x2020002050, stack: 0xcc0000
Initialising xenbus
Thread "xenstore": pointer: 0x2020002800, stack: 0xcd0000
Dummy main: start_info=0x985a80
Thread "main": pointer: 0x2020002fb0, stack: 0xce0000
Thread "pcifront": pointer: 0x2020003760, stack: 0xcf0000
"main" "(hd0,0)/boot/grub/menu.lst"
pcifront_watches: waiting for backend path to appear device/pci/0/backend
vbd 768 is hd0
******************* BLKFRONT for device/vbd/768 **********


backend at /local/domain/0/backend/vbd/8/768
Failed to read /local/domain/0/backend/vbd/8/768/feature-flush-cache.
2097152 sectors of 512 bytes
**************************
vbd 5632 is hd1
******************* BLKFRONT for device/vbd/5632 **********


backend at /local/domain/0/backend/vbd/8/5632




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