Re: pvgrub

[Jeremy Fitzhardinge <jeremy@goop.org>]

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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