linux-kernel - Re: [RFC PATCH v4 2/3] mm/mempolicy: export memory policy symbols

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Message-ID: <23487b60-eb7a-4b11-ab34-ab21e3efc335@amd.com>
Date: Wed, 19 Feb 2025 12:15:33 +0530
From: Shivank Garg <shivankg@....com>
To: Sean Christopherson <seanjc@...gle.com>, Vlastimil Babka <vbabka@...e.cz>
Cc: akpm@...ux-foundation.org, willy@...radead.org, pbonzini@...hat.com,
 linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
 linux-coco@...ts.linux.dev, chao.gao@...el.com, ackerleytng@...gle.com,
 david@...hat.com, bharata@....com, nikunj@....com, michael.day@....com,
 Neeraj.Upadhyay@....com, thomas.lendacky@....com, michael.roth@....com
Subject: Re: [RFC PATCH v4 2/3] mm/mempolicy: export memory policy symbols



On 2/18/2025 8:52 PM, Sean Christopherson wrote:
> On Mon, Feb 17, 2025, Vlastimil Babka wrote:
>> On 2/10/25 07:32, Shivank Garg wrote:
>>> Export memory policy related symbols needed by the KVM guest-memfd to
>>> implement NUMA policy support.
>>>
>>> These symbols are required to implement per-memory region NUMA policies
>>> for guest memory, allowing VMMs to control guest memory placement across
>>> NUMA nodes.
>>>
>>> Signed-off-by: Shivank Garg <shivankg@....com>
>>
>> I think we should use EXPORT_SYMBOL_GPL() these days.

Thanks Vlastimil, will use EXPORT_SYMBOL_GPL.

>>
>> Wasn't there also some way to limit the exports to KVM?
> 
> The infrastructure is still a WIP[1], though when that lands, I definitely plan
> on tightening down the KVM-induced exports[2].
> 
> [1] https://lore.kernel.org/all/20241202145946.108093528@infradead.org
> [2] https://lore.kernel.org/all/ZzJOoFFPjrzYzKir@google.com