[Xen-devel] [PATCH 0 of 4 V2] oxenstored fixes -- fixes recent pvops kernel hang

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Currently PVHVM Linux guests after ddacf5ef684a "xen/pv-on-hvm kexec:
add xs_reset_watches to shutdown watches from old kernel" hang when
run against oxenstored because it does not handle the unknown
XS_RESET_WATCHES operation and does not reply.

The symptom of this issue is a hang during boot at this point:
    cpu 1 spinlock event irq 70
    CPU 1 irqstacks, hard=dec94000 soft=dec96000
    Booting Node   0, Processors  #1
    smpboot cpu 1: start_ip = 99000
    Initializing CPU#1
    installing Xen timer for CPU 1
    Brought up 2 CPUs
    Total of 2 processors activated (9625.99 BogoMIPS).
    NET: Registered protocol family 16
    <HANG>

This series makes oxenstored handle unknown operations by returning an
error indicating that the operation is unknown. I have not actually
implemented support for XS_RESET_WATCHES.

I also include a patch which I've been using for some time to enable
the use of oxenstored in preference to C xenstored when available.

Also included are two (more) little cleanup patches

Changes since v1: 

* First two cleanup patches applied already
* Two more cleanup patches added
* Fixed warning in "handle unknown operations by returning an error to
  the client"

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