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Pawel Wieczorkiewicz
ef87efee9d
By default, in the quiescing zone, a livepatch payload is applied with apply_payload() and reverted with revert_payload() functions. Both of the functions receive the payload struct pointer as a parameter. The functions are also a place where standard 'load' and 'unload' module hooks are executed. To increase livepatching system's agility and provide more flexible long-term livepatch solution, allow to overwrite the default apply and revert action functions with hook-like supplied alternatives. The alternative functions are optional and the default functions are used by default. Since the alternative functions have direct access to the livepatch payload structure, they can better control context of the 'load' and 'unload' hooks execution as well as exact instructions replacement workflows. They can be also easily extended to support extra features in the future. To simplify the alternative function generation move code responsible for payload and livepatch region registration outside of the function. That way it is guaranteed that the registration step occurs even for newly supplied functions. Signed-off-by: Pawel Wieczorkiewicz <wipawel@amazon.de> Reviewed-by: Petre Eftime <epetre@amazon.com> Reviewed-by: Martin Pohlack <mpohlack@amazon.com> Reviewed-by: Norbert Manthey <nmanthey@amazon.com> Reviewed-by: Andra-Irina Paraschiv <andraprs@amazon.com> Reviewed-by: Bjoern Doebel <doebel@amazon.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Ross Lagerwall <ross.lagerwall@citrix.com>
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