linux-kernel - Re: [PATCH RFC] rxe: Fix iova-to-va conversion for MR page sizes != PAGE

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Message-ID: <68c333fb-7026-4412-9bcd-be877b95b99f@fujitsu.com>
Date: Tue, 30 Dec 2025 04:47:00 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"zyjzyj2000@...il.com" <zyjzyj2000@...il.com>, "jgg@...pe.ca" <jgg@...pe.ca>,
	"leon@...nel.org" <leon@...nel.org>, Yi Zhang <yi.zhang@...hat.com>
Subject: Re: [PATCH RFC] rxe: Fix iova-to-va conversion for MR page sizes !=
 PAGE_SIZE

Hi Yanjun,


On 30/12/2025 12:02, Zhu Yanjun wrote:
>>>
>>
>> Hi, Yi
>>
>> The mentioned testcase, the link is:
>> https://lore.kernel.org/all/CAHj4cs9XRqE25jyVw9rj9YugffLn5+f=1znaBEnu1usLOciD+g@mail.gmail.com/T/
>>
>> Can you help to make tests to verify whether this problem is fixed or not?
>>
> 
> On x86_64 hosts, after this commit is applied, all the testcases in rdma-core can pass. But in Fedora Core 42 with ARM64 architecture,
> 
> there are some errors with rdma-core.


Many thanks for your testing.

This commit should only affect IB_MR_TYPE_MEM_REG MRs, which are exposed to the
Upper Layer Protocol (ULP) in the current kernel.

Since rdma-core typically utilizes IB_MR_TYPE_USER(mr.page_size always same with PAGE_SIZE), it should not be impacted.

Thanks
Zhijian

> 
> I did not make tests with blktest.