[Xen-API] [PATCH 0 of 5 v3] Tools: Console ring improvements

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Hello,

The following set of patches came about when trying to fix the 32K limitation
with stub_xc_readconsolering() in the ocaml bindings.

Patch 1 is a hypervisor patch adding a new SYSCTL hypercall to query the size
of the console ring, which is fixed but otherwise inaccessible after boot.

Patches 2 thru 5 are tools patches:
 * Patch 2 adds a libxc function to use the new SYSCTL hypercall.
 * Patch 3 implements an alternative xc_readconsolering() to prevent bounce
   buffering.
 * Patch 4 uses the preceding patches to fix the implementation of
   stub_xc_readconsolering() in the ocaml bindings.
 * Patch 5 is a misc threading fix in the ocaml bindings, discovered when
   trying to fix the console functionality.

There are minimal changes in v3.  The changes are mostly style tweaks, extra
comments and rebasing on top of unstable.

CC'd is xen-api@xxxxxxxxxxxxx as well, for comment on the ocaml patches.

This patch set has been compile-tested on unstable, and functionally tested
via backport to 4.2 (which was only one whitespace fuzz issue and no code
change).

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>


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