linux-kernel - Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit

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Date:   Sat, 16 Apr 2022 09:30:21 +0800
From:   "zhangfei.gao@...mail.com" <zhangfei.gao@...mail.com>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        jean-philippe <jean-philippe@...aro.org>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID
 allocation and free it on mm exit



On 2022/4/15 下午8:37, Fenghua Yu wrote:
> Hi, Zhangfei,
>
> On Fri, Apr 15, 2022 at 07:52:03PM +0800, zhangfei.gao@...mail.com wrote:
>>
>> On 2022/4/15 下午6:50, Fenghua Yu wrote:
>>> Hi, Zhangfei,
>>>
>>> On Fri, Apr 15, 2022 at 06:14:09PM +0800, zhangfei.gao@...mail.com wrote:
>>> I download this patch from:
>>> https://lore.kernel.org/lkml/YllADL6uMoLllzQo@fyu1.sc.intel.com/raw
>>> git am to either v5.18-rc2 or the latest upstream without any issue.
>> It is my copy paste issue.
>>
>> I have tested, nginx woks well.
> Great!
>
>> Other than the following issue,
>> Each time /sbin/nginx will alloc ioasid but not free.
>> which I think it maybe nginx issue or the mis-usage, will ask there.
> Which nginx/openssl function is supposed to call kernel sva_unbind? I couldn't
> find the function in nginx tree.
>
> If nginx doesn't free ioasid, it will cause ioasid leak and memory leak.
Yes

In my case, sva_bind/unbind is from openssl_engine, bind_fn, not in 
nginx itself
nginx will use openssl -> openssl engine.

nginx:
src/core/nginx.c
main
ngx_ssl_init(log);

OPENSSL_init_ssl(OPENSSL_INIT_LOAD_CONFIG, NULL)


openssl_engine
IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
bind_fn
sva_bind

destroy
sva_unbind

But destroy seems not called in sbin/nginx -s quit.


Thanks