Amazon Technologies, Inc.

Yuhui Zheng

Robert Charles Swanson

Filippo Sironi

Tsung Ho Wu

Pankaj Kumar Rai

Nandagopal Sathyanarayanan

Maulik Kapuria

Sang Phill Park

A host server computer with an uncorrectable memory error can be repaired without a reboot operation. While initially booting a hypervisor, a special software Application Programming Interface (API) can be loaded between a BIOS System Management Mode (SMM) code and the hypervisor. Once the host server computer is booted and a number of virtual machines are executing, a memory error (e.g., uncorrectable error correction code (UECC)) can occur. In response, the hypervisor calls into the special software API identifying the defective memory rows that the BIOS needs to repair. The BIOS starts a soft Post Package Repair (PPR) process on those rows and gives back control to the hypervisor. When the repair is completed, the hypervisor loads a scrubbing virtual machine and validates that the memory is corrected. After the repair is validated, the hypervisor allows the available partition to take a new customer instance.

Runtime memory repair without requiring a reboot of a server computer

Growing community of inventors

Seattle, WA, United States of America

Yuhui Zheng