Re: [PATCH bpf-next v2 0/5] execmem_alloc for BPF programs

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On Tue, Nov 15, 2022 at 2:14 PM Edgecombe, Rick P
<rick.p.edgecombe@xxxxxxxxx> wrote:
>
> On Tue, 2022-11-15 at 13:54 -0800, Song Liu wrote:
> > On Tue, Nov 15, 2022 at 9:34 AM Edgecombe, Rick P
> > <rick.p.edgecombe@xxxxxxxxx> wrote:
> > >
> > > On Mon, 2022-11-14 at 17:30 -0800, Song Liu wrote:
> > > > Currently, I have got the following action items for v3:
> > > > 1. Add unify API to allocate text memory to motivation;
> > > > 2. Update Documentation/x86/x86_64/mm.rst;
> > > > 3. Allow none PMD_SIZE allocation for powerpc.
> > >
> > > So what do we think about supporting the fallback mechanism for the
> > > first version, like:
> > >
> > >
> https://lore.kernel.org/all/9e59a4e8b6f071cf380b9843cdf1e9160f798255.camel@xxxxxxxxx/
> > >
> > > It helps the (1) story by actually being usable by non-text_poke()
> > > architectures.
> >
> > I personally think this might be a good idea. We will need this when
> > we use
> > execmem_alloc for modules. But I haven't got a chance to look at
> > module code in
> > great detail. I was thinking of adding this logic with changes in
> > module code.
>
> BPF used to have a generic allocator that just called module_alloc().
> If you had a fallback method could you unify all of BPF to use
> execmem()?

Yes, we can use execmem as the unified API for all BPF JIT engines.

Song



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