: When the hypervisor needs to switch between VMs, it saves the current floating-point state of the active VM into its designated FPState VSO. Then, it restores the floating-point state of the VM that will be running next by loading the state from its FPState VSO.
In traditional computing environments, when the operating system switches between processes, it saves and restores the FPSTATE to ensure continuity. However, in virtualized environments, this process becomes more complex due to the additional layer of abstraction introduced by the hypervisor (the software that creates and manages VMs). fpstate vso
FPState VSO can either be a vendor-extended representation of CPU floating-point state used in kernels/hypervisors or a software module for managing FP contexts. Key considerations are correct capture/restore semantics, alignment and compatibility with CPU features, secure serialization for migration, and versioned extensibility. : When the hypervisor needs to switch between
Demystifying fpstate and vDSO in the Linux Kernel: High-Performance Context Switching and Signal Handling Demystifying fpstate and vDSO in the Linux Kernel:
The FPSTATE structure is not a monolithic blob but is composed of distinct fields, as seen in the Pin API documentation:
The _vstate member is thus a critical component for any tool that needs to understand or control a program's numerical computation.
To understand what "fpstate vso" refers to in a technical context, one must look at how modern operating systems handle processor states.