Re: [PATCH v3 00/24] KVM: TDX huge page support for private memory

[Sean Christopherson]

On Wed, Jan 07, 2026, Rick P Edgecombe wrote:
> On Tue, 2026-01-06 at 15:43 -0800, Sean Christopherson wrote:
> > Mapping a hugepage for memory that KVM _knows_ is contiguous and homogenous is
> > conceptually totally fine, i.e. I'm not totally opposed to adding support for
> > mapping multiple guest_memfd folios with a single hugepage.   As to whether we
> > do (a) nothing, (b) change the refcounting, or (c) add support for mapping
> > multiple folios in one page, probably comes down to which option provides "good
> > enough" performance without incurring too much complexity.
> 
> Can we add "whether we can push it off to the future" to the considerations
> list? The in-flight gmem stuff is pretty complex and this doesn't seem to have
> an ABI intersection.

Ya, for sure.  The only wrinkle I can think of is if the refcounting somehow
bleeds into userspace, but that seems like it'd be a flaw on its own.