PRM: SMM Goes on a Diet - Michael Kubacki from uefi boot mode secure boot off vs on Watch Video
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⏲ Duration: 24 min 18 sec ✓ Published: 07-Dec-2020
Description: System Management Mode (SMM), often referred to as ring -2, is an operating mode in x86 computer architecture that is notoriously difficult to debug and secure. To system software including the hypervisor and kernel, SMM is a lurking black box that can asynchronously take control of all system processors for an arbitrary duration of time leading to unpredictable performance degradation. SMM code is stored on non-volatile storage such as SPI flash and loaded during firmware boot alongside other U
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