Re: [PATCH v3 07/30] kho: add interfaces to unpreserve folios and physical memory ranges

On Mon, Aug 18, 2025 at 9:55 AM Jason Gunthorpe [off-list ref] wrote:

On Fri, Aug 15, 2025 at 12:12:10PM +0300, Mike Rapoport wrote:

quoted

quoted

Which is perhaps another comment, if this __get_free_pages() is going
to be a common pattern (and I guess it will be) then the API should be
streamlined alot more:

 void *kho_alloc_preserved_memory(gfp, size);
 void kho_free_preserved_memory(void *);

This looks backwards to me. KHO should not deal with memory allocation,
it's responsibility to preserve/restore memory objects it supports.

Then maybe those are luo_ helpers

But having users open code __get_free_pages() and convert to/from
struct page, phys, etc is not a great idea.

I added:

void *luo_contig_alloc_preserve(size_t size);
void luo_contig_free_unpreserve(void *mem, size_t size);

Allocate contiguous, zeroed, and preserved memory.

Pasha