While the Linux kernel still hasn’t added any formal control yet for AMD Predictive Store Forwarding to disable it short of also toggling Spectre V4 / SSBD, with the Linux 5.16 kernel the AMD PSF bit will now be exposed to KVM guest virtual machines so that they — either with a patched/future kernel or for other operating systems — may choose to toggle explicitly disable this AMD CPU feature…

Source: Phoronix – Linux 5.16 To Expose AMD PSF Disable Bit To KVM Guests