FEMU TODOs

Plans to improve FEMU

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(1). Refactor the code base: black-box and white-box modes are better designed as children of the base FEMUCtrl structure

(2). Add ZNS (Zoned-NameSpace) support

(3). Add SmartSSD support: emulating existing SmartSSDs for in/near-storage computing

(4). Add KVSSD support: emulating an SSD with a KV interface

• NVMe KV standard protocol support
• KV-FTL

(5). FEMU Black-box FTL Improvement

• Add multi-stream support
• Add TRIM/deallocate support
• Add statistics (through SMART information)
• Add more policies for GC, WL, mapping, etc.
• Add reliability feature emulation

(7). Base FEMU performance optimization:

• VMexit-less virtual interrupt injection (profiling and elimination)
• Dynamic poller activation, no need to always poll, make efficient use of CPUs while still reaping the benefits of polling

(8). Module media/NAND emulation layer:

• Add support for more media types, e.g. more NAND types (TLC/QLC/PLC), DRAM/NVM
• Add support for more advanced NAND commands and efficient arbitration mechanism

(9). FEMU Management Utilities

• Unify the configuration interface for black-box and white-box modes
• Persist the data and SSD states to files and restore them upon VM reboot
• Add a method to quickly warmup the device to steady state