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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Yangchao Zhou <zhouyates@gmail.com>, dev@dpdk.org
Subject: Re: [PATCH v2] kni: fix possible kernel crash with va2pa
Date: Tue, 19 Mar 2019 18:35:19 +0000
Message-ID: <0463b35b-d38f-3e09-60bb-40bebf7c3cfd@intel.com> (raw)
In-Reply-To: <20190312092232.93640-1-zhouyates@gmail.com>

On 3/12/2019 9:22 AM, Yangchao Zhou wrote:
> va2pa depends on the physical address and virtual address offset of
> current mbuf. It may get the wrong physical address of next mbuf which
> allocated in another hugepage segment.
> 
> In rte_mempool_populate_default(), trying to allocate whole block of
> contiguous memory could be failed. Then, it would reserve memory in
> several memzones that have different physical address and virtual address
> offsets. The rte_mempool_populate_default() is used by
> rte_pktmbuf_pool_create().
> 
> Signed-off-by: Yangchao Zhou <zhouyates@gmail.com>
> ---
> v2: Add an explanation that causes this problem.
>     Use m->next to store physical address.

Overall code looks good to me, thanks for the work, it looks pretty clean.
I would like to do some test before giving an ack.

Meanwhile, can you please update kni documentation, to document for the mbufs
sent to kernel has mbuf->next fields as physical address. It is OK to send as a
new version of the patch with documentation.

Thanks,
ferruh

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-28  7:30 [PATCH] " Yangchao Zhou
2019-03-06 17:31 ` Ferruh Yigit
2019-06-14 18:41   ` [dpdk-dev] " Dey, Souvik
2019-03-12  9:22 ` [PATCH v2] " Yangchao Zhou
2019-03-19 18:35   ` Ferruh Yigit [this message]
2019-03-22 20:49   ` Ferruh Yigit
2019-06-18  4:06     ` [dpdk-dev] " Dey, Souvik
2019-06-18 15:48   ` Stephen Hemminger
2019-06-25 15:04   ` [dpdk-dev] [PATCH v3] " Yangchao Zhou
2019-07-02 20:07     ` [dpdk-dev] [v3] " Junxiao Shi
2019-07-10 20:11       ` Ferruh Yigit
2019-07-10 20:40         ` yoursunny
2019-07-10 21:23           ` Ferruh Yigit
2019-07-10 23:52             ` yoursunny
2019-07-10 20:09     ` [dpdk-dev] [PATCH v3] " Ferruh Yigit
2019-07-11  7:46       ` Ferruh Yigit
2019-07-15 20:50         ` Thomas Monjalon

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