Fpstate Vso Guide
Executive Summary
- Context switching in kernels: save/restore FPState VSO on thread switch for correctness.
- VM migration: serialize FPState VSO to transfer CPUFPU state across hosts.
- Signal handling: dumping FP registers on crashes for postmortem analysis.
- JIT compilers/VMs: manage extended registers when executing generated code.
Windows
On : Not directly exposed. Windows uses KeSaveExtendedProcessorState with pre-allocated buffers per thread (no VSO equivalent).
Verdict:
VSO + Eager FPU is more secure than lazy FPU, but not more secure than eager FPU with a fixed buffer. fpstate vso
Would you like a focused article for one of these interpretations (kernel/hypervisor integration, or a software library API), or do you have a specific platform in mind (x86_64, ARM, Linux, Windows)? Executive Summary
