Re: [PATCH v10 40/41] KVM: selftests: Update private_mem_conversions_test to mmap() guest_memfd

[Sean Christopherson]

On Fri, Aug 21, 2026, Xiaoyao Li wrote:
> On 8/8/2026 5:53 AM, Ackerley Tng via B4 Relay wrote:
> > From: Ackerley Tng<ackerleytng@xxxxxxxxxx>
> > 
> > Update the private memory conversions selftest to also test conversions
> > that are done "in-place" via per-guest_memfd memory attributes. In-place
> > conversions require the host to be able to mmap() the guest_memfd so that
> > the host and guest can share the same backing physical memory.
> > 
> > This includes several updates, that are conditioned on the system
> > supporting per-guest_memfd attributes (kvm_has_gmem_attributes):
> > 
> > 1. Set up guest_memfd requesting MMAP and INIT_SHARED.
> 
> If I understand correctly, even with in-place gmem, the model that shared
> memory comes from the userspace_addr and private memory comes from gmem can
> still work without passing GUEST_MEMFD_FLAG_MMAP flag.
> 
> Since this model is not prohibited by KVM. I think we should keep the
> testcase for this model to ensure test coverage?

+1.  Deprecated doesn't mean unsupported.