On Tue, Nov 23, 2021 at 09:41:34AM +0100, Paolo Bonzini wrote: > On 11/19/21 14:47, Chao Peng wrote: > > For fd-based memslot store the file references for shared fd and the > > private fd (if any) in the memslot structure. Since there is no 'hva' > > concept we cannot call hva_to_pfn() to get a pfn, instead kvm_memfd_ops > > is added to get_pfn/put_pfn from the memory backing stores that provide > > these fds. > > > > Signed-off-by: Yu Zhang<yu.c.zhang@xxxxxxxxxxxxxxx> > > Signed-off-by: Chao Peng<chao.p.peng@xxxxxxxxxxxxxxx> > > --- > > What about kvm_read/write_guest? Hmm, that would be another area KVM needs to change. Not totally undoable. > Maybe the proposal which kept > userspace_addr for the shared fd is more doable (it would be great to > ultimately remove the mandatory userspace mapping for the shared fd, but I > think KVM is not quite ready for that). Agree for short term keeping shared part unchanged would be making work easy:) Let me try that to see if any blocker. > > Paolo
