On 6/2/23 09:11, Michael Kelley (LINUX) wrote: > Tom -- Does the above sequence *depend* on the hypervisor doing anything > to make it work? I'm not clear on why KVM would automatically change the > page over to private. If there's a dependency on the hypervisor doing > something, then it seems like we'll need to standardize that "something" > across hypervisors, lest we end up with per-hypervisor code in Linux to handle > this scenario. And running SEV-SNP with multiple VMPLs probably makes it > even more complicated. > > Kirill -- Same question about TDX. Does making load_unaligned_zeropad() > work in a TDX VM depend on the hypervisor doing anything? Or is the > behavior seen by the guest dependent only on architected behavior of > the TDX processor? No, there's no active help from the hypervisor here. Also, fwiw, the "architected behavior" here is really just the TDX module policy and _arguably_ the hardware Secure-EPT controlled by the TDX module.
