Okay, so I need to figure out whether this bug report is related to user-mode or system-mode in QEMU. The error message says "Failure with macOS 15.2 on ARM64: Property 'host-arm-cpu.sme' not found." First, let's break down the components here. QEMU can run in both user mode and system mode. User-mode emulation typically involves running a single process without a full OS, while system-mode runs an entire operating system with all its services. The error mentions macOS 15.2 on ARM64, which suggests that it's dealing with hardware virtualization or system-level operations because macOS is the host OS here. The property 'host-arm-cpu.sme' not found—SME usually stands for Scalable Vector Extension (SVE) in ARM contexts. Maybe this relates to CPU features required by the virtualized environment. Since the issue occurs on macOS, which is a higher privilege environment when running VMs, and it's about a missing property related to ARM CPU features, this likely pertains to system-mode because it involves the host's CPU capabilities needed for running a full OS in a VM. So I think it's a system-mode issue. system