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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Message-ID: <7ad996df-28ca-0aee-be23-e75bcca8d136@intel.com>
Date:   Thu, 28 Apr 2022 09:35:39 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Peter Zijlstra <peterz@...radead.org>, robin.murphy@....com,
        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>, zhangfei.gao@...aro.org,
        Thomas Gleixner <tglx@...utronix.de>, will@...nel.org
Subject: Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID
 allocation and free it on mm exit

On 4/28/22 09:01, Jean-Philippe Brucker wrote:
>> But, this misses an important point: even after the address space is
>> gone, the PASID will still be programmed into a device.  Device drivers
>> might, for instance, still need to flush operations that are outstanding
>> and need to use that PASID.  They do this at ->release() time.
> It's not really clear which release() this is. For us it's file descriptor
> release() (not MMU notifier release(), which is how I initially understood
> this sentence)

OK, maybe that should be: "file->release() time" to make it more clear.