International Business Machines Corporation

Janet R Easton

Leslie W Wyman

Damian Leo Osisek

Richard P Tarcza

Gustav E Sittmann, Iii

Frank William Brice

Tan Lu

William Alan Holder

Kenneth J Oakes

Bernd Nerz

Mark S Farrell

Harry M Yudenfriend

Thomas Anthony Gregg

Jeffrey Paul Kubala

Donald W Schmidt

Charles W Gainey, Jr

David F Craddock

Steven G Glassen

John S Trotter

Brenton F Belmar

Charles E Shapley

Marten J Halma

Hans-Helge Lehmann

Joachim Von Buttlar

Martin Taubert

Andrew W Piechowski

Gustav E Sittman, Iii

Lisa Cranton Heller

Daniel Francis Casper

Charles Franklin Webb

Bruce H Ratcliff

Scott M Carlson

Eric N Lais

Beth A Glendening

Geoffrey Owen Blandy

Arthur James Stagg

Eugene P Hefferon

Michael E Baskey

Allan Samuel Meritt

Dale Francis Riedy, Jr

Jeffrey Mark Nick

Jerry Wayne Stevens

Norbert Hagspiel

Kulwant M Pandey

Ugochukwu Charles Njoku

Gary E Strait

John Andrew Aiken, Jr

Anthony R Sager

Ambrose A Verdibello, Jr

Stephen G Wilkins

Elke G Nass

Douglas G Balazich

Frank W Brice

Wolfgang Eckert

Ambrose Verdibello

Ugochukwu Njoku-Charles

Heinrich K Lindner

Steven Messinger

Michael D Campbell

Robert M Whalen, Jr

Marcus Eder

Ming H Cheung

Donald William Schmidt

Gustav Iii Sittmann

Mark Farrel

Brenton Francois Belmar

Eric Norman Lais

Gustav Sittmann Iii

Gustav Sittmann

Input/output (I/O) operation requests from pageable storage mode guests are interpreted without host intervention. In a pageable mode virtual environment, requests issued by pageable storage mode guests are processed by one or more processors of the environment absent intervention from one or more hosts of the environment. Processing of the requests includes manipulating, by at least one processor on behalf of the guests, buffer state information stored in host storage. The manipulating is performed via instructions initiated by the guests and processed by one or more of the processors.

Set buffer state instruction

Interpreting I/O operation requests from pageable guests without host intervention

Host page management assist functions are employed to manage storage of a pageable mode virtual environment. These functions enable storage to be managed by a processor of the environment absent intervention of a host of the environment. The functions include a resolve host page function; a pin function; and unpin functions.

Facilitating management of storage of a pageable mode virtual environment absent intervention of a host of the environment

A command is issued to reset one or more pending interrupt indicators and arbitrate for ownership of the interrupt. Responsive to a processor receiving the command, a check is made of a selected pending interrupt indicator. If the selected pending interrupt indicator is not set, another pending interrupt indicator is checked, instead of providing a negative response and reissuing the command. In this way, one dequeue command can replace multiple dequeue commands and the overhead of leaving and re-entering the interrupt handler is reduced. A negative response is reserved for those situations in which there are no pending interrupt indicators to be reset.

Dequeue operation using mask vector to manage input/output interruptions

One or more message signaled interruption requests from one or more input/output (I/O) adapters are converted to I/O adapter event notifications. Each I/O adapter event notification includes the setting of one or more specific indicators in system memory and an interruption request, the first of which results in a pending I/O adapter interruption request. While a request for an I/O adapter interruption is pending, subsequent message signaled interruption requests are converted to I/O adapter event notifications, but do not result in additional requests for I/O adapter interruptions.

Converting a message signaled interruption into an I/O adapter event notification

A source identification facility is provided that enables identification of the one or more types of adapters requesting an interrupt in order to facilitate processing of the interrupt. The adapter types are accessible to the operating system and are used to tailor processing by the operating system of the interrupt.

Identification of types of sources of adapter interruptions

The conditions under which adapter interruptions are made pending are controlled. Responsive to an interruption being presented to an operating system, subsequent interruptions are suppressed on all central processing units in the configuration. The operating system processes the interruption, including examining and processing indicators of reported events until the operating system discontinues the suppression. This enables the operating system to control the number of pending interruptions and the number of processors processing those interruptions.

Controlling a rate at which adapter interruption requests are processed

One or more message signaled interruption requests from one or more input/output (I/O) adapters are converted to I/O adapter event notifications while retaining the message vector indication. An I/O adapter event notification may be routed and presented to a host or to a guest that the host is executing. To present the notification to the correct host or to the correct guest, various data structures in host and/or guest memory are used.

Converting a message signaled interruption into an I/O adapter event notification to a guest operating system

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Woodstock, NY, United States of America

Janet R Easton