FPState VSO is a fictional (or unspecified) term that could refer to one of several things depending on context: a software component, a hardware register/state in a floating-point unit, a vendor-specific object (VSO) in virtualization/storage, or an acronym used in a niche project. Below I provide a concise, useful article that assumes two likely interpretations and covers definition, technical details, use cases, examples, and troubleshooting.
While there is no official "vso" feature for fpstate, the proximity of these terms in technical discussions usually centers on system call overhead. The Linux Kernel Archives Floating-point API - The Linux Kernel documentation fpstate vso
Traditionally, operating systems handled floating-point state with a static approach. When a task (process or thread) is context-switched out, the kernel needs to save the FPU/SIMD state to memory so the next task can use the registers. FPState VSO — Overview and Guide FPState VSO
Thus, a County Veteran Service Officer who works for the State of Texas (not a VSO) is actually an FPSTATE agent, even though they function like a VSO. This is the primary source of confusion. The Linux Kernel Archives Floating-point API - The