On Thu, Nov 02, 2023, Fuad Tabba wrote: > On Wed, Nov 1, 2023 at 9:55 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > E.g. a misbehaving userspace could prematurely delete a memslot. And the more > > fun example is intrahost migration, where the plan is to allow pointing multiple > > guest_memfd files at a single guest_memfd inode: > > https://lore.kernel.org/all/cover.1691446946.git.ackerleytng@xxxxxxxxxx > > > > There was a lot of discussion for this, but it's scattered all over the place. > > The TL;DR is is that the inode will represent physical memory, and a file will > > represent a given "struct kvm" instance's view of that memory. And so the memory > > isn't reclaimed until the inode is truncated/punched. > > > > I _think_ this reflects the most recent plan from the guest_memfd side: > > https://lore.kernel.org/all/1233d749211c08d51f9ca5d427938d47f008af1f.1689893403.git.isaku.yamahata@xxxxxxxxx Doh, sitting in my TODO folder... https://lore.kernel.org/all/20231016115028.996656-1-michael.roth@xxxxxxx > Thanks for pointing that out. I think this might be the way to go. > I'll have a closer look at this and see how to get it to work with > pKVM.
