On Mon, May 20, 2024, Kai Huang wrote: > On Wed, 2024-05-01 at 03:52 -0500, Michael Roth wrote: > > This will handle the RMP table updates needed to put a page into a > > private state before mapping it into an SEV-SNP guest. > > > > > > [...] > > > +int sev_gmem_prepare(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, int max_order) ... > +Rick, Isaku, > > I am wondering whether this can be done in the KVM page fault handler? No, because the state of a pfn in the RMP is tied to the guest_memfd inode, not to the file descriptor, i.e. not to an individual VM. And the NPT page tables are treated as ephemeral for SNP.
