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author | Ian Jackson <ian.jackson@eu.citrix.com> | 2012-06-28 18:43:21 +0100 |
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committer | Ian Jackson <ian.jackson@eu.citrix.com> | 2012-06-28 18:43:21 +0100 |
commit | 8f48fc7f4cd15624f8b2bd666d53502d12aff621 (patch) | |
tree | c1fef94312da9ec41d8631909462984fd9a217bb /.rootkeys | |
parent | 7649bfcf318675e017ba22ab1cc46b83802ff361 (diff) | |
download | xen-8f48fc7f4cd15624f8b2bd666d53502d12aff621.tar.gz xen-8f48fc7f4cd15624f8b2bd666d53502d12aff621.tar.bz2 xen-8f48fc7f4cd15624f8b2bd666d53502d12aff621.zip |
libxl: domain save: API changes for asynchrony
Change the internal and external APIs for domain save (suspend) to be
capable of asynchronous operation. The implementation remains
synchronous. The interfaces surrounding device model saving are still
synchronous.
Public API changes:
* libxl_domain_save takes an ao_how.
* libxl_domain_remus_start takes an ao_how. If the
libxl_domain_remus_info is NULL, we abort rather than returning an
error.
* The `suspend_callback' function passed to libxl_domain_save is
never called by the existing implementation in libxl. Abolish it.
* libxl_domain_save takes its flags parameter as an argument.
Thus libxl_domain_suspend_info is abolished.
* XL_SUSPEND_* flags renamed to LIBXL_SAVE_*.
* Callers in xl updated.
Internal code restructuring:
* libxl__domain_suspend_state member types and names rationalised.
* libxl__domain_suspend renamed from libxl__domain_suspend_common.
(_common here actually meant "internal function").
* libxl__domain_suspend takes a libxl__domain_suspend_state, which
where the parameters to the operation are filled in by the caller.
* xc_domain_save is now called via libxl__xc_domain_save which can
itself become asynchronous.
* Consequently, libxl__domain_suspend is split into two functions at
the callback boundary; the second half is
libxl__xc_domain_save_done.
* libxl__domain_save_device_model is now called by the actual
implementation rather than by the public wrapper. It is already in
its proper place in the domain save execution sequence. So
officially make it part of that execution sequence, renaming it to
domain_save_device_model.
* Effectively, rewrite the public wrapper functions
libxl_domain_suspend and libxl_domain_remus_start.
* Remove a needless #include <xenctrl.h>
* libxl__domain_suspend aborts on unexpected domain types rather
than mysteriously returning EINVAL.
* struct save_callbacks moved from the stack to the dss.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
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