In preparation for Xeon Scalable “Sapphire Rapids” processors, Linux 5.16 adds support for Advanced Matrix Extensions. But that AMX bring-up is more invasive than when introducing AVX as with AMX the feature needs to be “requested” for use by user-space, among other changes. As such extra handling also needed to be introduced for the Kernel-based Virtual Machine (KVM) that hadn’t made it for v5.16 but now it looks like the AMX KVM support may be ready for mainline…

Source: Phoronix – Intel AMX Support For KVM Use May Be Ready For Mainline