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

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Message-ID: <CA+CK2bDc+-R=EuGM2pU=Phq8Ui-8xsDm0ppH6yjNR0U_o4TMHg@mail.gmail.com>
Date: Sun, 21 Sep 2025 18:20:50 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Mike Rapoport <rppt@...nel.org>, pratyush@...nel.org, jasonmiu@...gle.com, 
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Subject: 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 <jgg@...dia.com> wrote:
>
> On Fri, Aug 15, 2025 at 12:12:10PM +0300, Mike Rapoport wrote:
> > > 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