On Wed, 10 Jul 2024 07:45:52 +0100, Tangnianyao <tangnianyao@xxxxxxxxxx> wrote: > > Hi Marz, > > I'm trying to learn pKVM and have a question. > > Why pKVM developed on E2H=0 firstly? It tried to avoid host access > guest memory with stage2 translation, and it seems not necessarily > rely on HCR_EL2.E2H=0. Because we don't want to leave ARMv8.0 systems behind. They are still a large portion of the arm64 HW running Linux. > Is hVHE an alternative plan of pKVM ? To allow pKVM run on E2H res1 system ? Supporting E2H RES1 implementations is indeed one of the motivations. But there is a lot more to it, such as being able to use the two TTBRs to perform address space isolation inside the hypervisor. I presented this[1] at KVM Forum two years ago, which explains what we could do (some of which is already in progress). M. [1] https://static.sched.com/hosted_files/kvmforum2022/b4/NYSM-NYD-KVM-2022.pdf -- Without deviation from the norm, progress is not possible.
