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

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Message-ID: <aNTSelHwg7mvs1KI@kernel.org>
Date: Thu, 25 Sep 2025 08:26:18 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: Jason Gunthorpe <jgg@...dia.com>, pratyush@...nel.org,
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Subject: Re: [PATCH v3 07/30] kho: add interfaces to unpreserve folios and
 physical memory ranges

On Sun, Sep 21, 2025 at 06:20:50PM -0400, Pasha Tatashin wrote:
> 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);

Why not add them to KHO?
 
> Allocate contiguous, zeroed, and preserved memory.
> 
> Pasha

-- 
Sincerely yours,
Mike.