Google contributes KVM patches upstream. See https://www.phoronix.com/news/KVM-CPUFreq-RFC-Patches , https://www.phoronix.com/news/Google-New-ASI-KVM-2022, https://www.phoronix.com/forums/forum/hardware/processors-me...
Regarding AWS, I would also add Firecracker for AWS Lambda, which uses KVM.