[Xen-API] [PATCH 0 of 5 v4] 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.

The only change for v4 is to change from caml_copy_string to
caml_alloc_string/memcpy to allow for NULL characters in the console ring.

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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