Re: [PATCH v4 07/16] x86/virt/tdx: Add tdx_alloc/free_page() helpers

[Edgecombe, Rick P]

On Wed, 2025-12-03 at 12:13 -0800, Dave Hansen wrote:
> BTW, I *DO* expect the DPAMT pages to be mostly allocated forever. Maybe
> I'm just a pessimist, but you can't get them back for compaction or
> reclaim, so they're basically untouchable. Sure, if you kill all the TDX
> guests you get them back, but that's a very different kind of kernel
> memory from stuff that's truly reclaimable under pressure.

If we want to improve it (later) we could topup via a single higher order
allocation. So like if we need 15 pages we could round up to an order-4, then
hand them out individually. But I suspect someone would want to see some proof
before that kind of tweak.

So I take it you are ok to leave the general approach, but worth trying to
remove the dynamic sizing.