linux-kernel - Re: [RFC PATCH v3 06/12] memory-provider: dmabuf devmem memory provider

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Date:   Tue, 7 Nov 2023 17:10:09 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Mina Almasry <almasrymina@...gle.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jeroen de Borst <jeroendb@...gle.com>,
        Praveen Kaligineedi <pkaligineedi@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 06/12] memory-provider: dmabuf devmem memory
 provider

On 11/7/23 5:02 PM, Mina Almasry wrote:
> On Mon, Nov 6, 2023 at 1:02 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>>
>> On 11/05, Mina Almasry wrote:
>>> +static inline bool page_is_page_pool_iov(const struct page *page)
>>> +{
>>> +     return (unsigned long)page & PP_DEVMEM;
>>> +}
>>
>> Speaking of bpf: one thing that might be problematic with this PP_DEVMEM
>> bit is that it will make debugging with bpftrace a bit (more)
>> complicated. If somebody were trying to get to that page_pool_iov from
>> the frags, they will have to do the equivalent of page_is_page_pool_iov,
>> but probably not a big deal? (thinking out loud)
> 
> Good point, but that doesn't only apply to bpf I think. I'm guessing
> even debugger drgn access to the bv_page in the frag will have trouble
> if it's actually accessing an iov with LSB set.
> 
> But this is not specific to this use for LSB pointer trick. I think
> all code that currently uses LSB pointer trick will have similar
> troubles. In this context my humble vote is that we get such big
> upside from reducing code churn that it's reasonable to tolerate such
> side effects.

+1

> 
> I could alleviate some of the issues by teaching drgn to do the right
> thing for devmem/iovs... time permitting.
> 
Tools like drgn and crash have to know when the LSB trick is used  -
e.g., dst_entry - and handle it when dereferencing pointers.