Linux 6.3-rc3 Adding Protection From Malicious Guests Hammering AMD's Secure Processor

[phoronix]

Phoronix: Linux 6.3-rc3 Adding Protection From Malicious Guests Hammering AMD's Secure Processor

A change sent in this Sunday ahead of the Linux 6.3-rc3 release is a late addition adding a throttling mechanism to protect the hypervisor from potentially malicious AMD Secure Encrypted Virtualization (SEV) guests. The change is to protect the AMD Secure Processor from being potentially overloaded with requests by nefarious guest VMs...

https://www.phoronix.com/news/Linux-6.3-AMD-SEV-Throttling

[kylew77]

Is SEV only supported by KVM or is it supported by any of the other hypervisors in particular the three BSD ones of VMM, Bhyve, and NVMM?

For example I see this in the man page for NVMM(4): The following backends are supported:
- x86-SVM, for x86 AMD CPUs
-x86-VMX, for x86 Intel CPUs
source: https://man.netbsd.org/nvmm.4