Comment by mcbridematt

IIRC Qualcomm smartphone SoCs have always run some kind of hypervisor, I believe it's to allow partitioning of the CPU cores with the modem/DSP.

They used to (mid-late 2000s) use an L4 derivative ("REX"?), with the more recent chips (including the 'X' series for PCs) using their homegrown "Gunyah" hypervisor (https://github.com/quic/gunyah-hypervisor)