Abstract:
Management of storage used by pageable guests of a computing environment is facilitated. An enhanced suppression-on-protection facility is provided that enables the determination of which level of protection (host or guest) caused a fault condition, in response to an attempted storage access.
Abstract:
A method is provided for determining whether a logical processor of an information processing system has access to an address space of the information processing system. An instruction is issued by a first processor, the instruction referencing a target logical processor and a target address space. In response to the instruction, first information is checked to determine whether the target logical processor is running. When it is determined that the target logical processor is not running, second information is checked by a host program to determine whether the target logical processor has access to the target address space.
Abstract:
What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being executed. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field.
Abstract:
An instruction is provided to perform a reset address translation protection operation when executed. Executing the instruction includes determining, by a processor, that an address translation protection bit in a specified translation table entry associated with a storage block is to be reset. Based on determining that the address translation protection bit is to be reset, executing the instruction includes resetting the address translation protection bit to deactivate write protection for the storage block. The resetting is absent waiting for an action by one or more other processors of the computing environment.
Abstract:
A guarded storage facility sets up a boundary indicating a range of addresses to be guarded or protected. When a program attempts to access an address in a guarded section defined by the boundary, a guarded storage event occurs. Use of this facility facilitates performance of certain tasks within a computing environment, including storage reclamation.
Abstract:
A system and method of implementing a modified priority routing of an input/output (I/O) interruption. The system and method determines whether the I/O interruption is pending for a core and whether any of a plurality of guest threads of the core is enabled for guest thread processing of the interruption in accordance with the determining that the I/O interruption is pending. Further, the system and method determines whether at least one of the plurality of guest threads enabled for guest thread processing is in a wait state and, in accordance with the determining that the at least one of the plurality of guest threads enabled for guest thread processing is in the wait state, routes the I/O interruption to a guest thread enabled for guest thread processing and in the wait state.
Abstract:
Un método para llevar a cabo una función de gestión de trama en un procesador (101) capaz de traducir una dirección virtual a una dirección traducida de un bloque de datos en almacenamiento principal en un sistema informático (100) de una arquitectura de máquina que tiene una jerarquía de tablas (410, 412, 414, 416) de traducción utilizadas para la traducción de dicha dirección virtual, estando definida dicha función de gestión de trama para dicha arquitectura de máquina, estando el método caracterizado por que comprende: obtener una instrucción de máquina que contiene un código de operación para una instrucción de activar clave de almacenamiento y borrar; y ejecutar la instrucción de máquina, comprendiendo: obtener un campo de gestión de trama con un campo de clave que comprende una serie de bits de protección de acceso y un campo de indicador del tamaño de bloque; obtener una dirección de operando de una trama de almacenamiento sobre la que ha de llevarse a cabo dicha instrucción de máquina, siendo dicha dirección de operando una entre una dirección de bloque grande de datos y una dirección de un bloque pequeño de datos; en respuesta a la habilitación de una función de activar clave de almacenamiento, poner los bits de protección de acceso de almacenamiento de cada clave de almacenamiento asociada con dicho bloque datos determinado, a un valor de dichos bits de protección de acceso de dicho campo de clave; y en respuesta a la habilitación de una función de borrar, borrar cada bloque datos al que se dirige dicha dirección de operando poniendo a cero todos los bytes de cada bloque de datos.