[Xen-devel] [PATCH 0 of 3 V2] libxl: domain shutdown cleanup

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

The existing libxl_domain_shutdown is a bit odd, it takes an integer
"req" which can be used to indicate one of:
  * [0] = "poweroff",
  * [1] = "reboot",
  * [2] = "suspend",
  * [3] = "crash",
  * [4] = "halt",

"suspend" is not usable via this interface since it requires other
scaffolding, libxl_domain_suspend provides this already.

"halt" is the same as "poweroff".

"crash" is unused and at least Linux does not implement it. If a user
steps forward then libxl_domain_crash is trivial to add.

Therefore split libxl_domain_shutdown into libxl_domain_shutdown and
libxl_domain_reboot corresponding to "poweroff" and "reboot"
respectively.

Also push responsibility for dealing with lack of PV drivers into the
caller and at the same time improve the error messages presented to
the user when they try and "xl shutdown/reboot" an HVM guest with no
PV drivers and the corresponding documentation.

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