linux-kernel - Re: [PATCH v4 07/10] iommu: Merge iommu_fault_event and iopf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7985c942-0cdb-7637-6610-fa5a8963f2ae@linux.intel.com>
Date:   Sat, 26 Aug 2023 15:02:25 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
Cc:     baolu.lu@...ux.intel.com, "Liu, Yi L" <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 07/10] iommu: Merge iommu_fault_event and iopf_fault

On 8/25/23 4:03 PM, Tian, Kevin wrote:
>> From: Lu Baolu <baolu.lu@...ux.intel.com>
>> Sent: Friday, August 25, 2023 10:30 AM
>>
>> -/**
>> - * struct iommu_fault_event - Generic fault event
>> - *
>> - * Can represent recoverable faults such as a page requests or
>> - * unrecoverable faults such as DMA or IRQ remapping faults.
>> - *
>> - * @fault: fault descriptor
>> - * @list: pending fault event list, used for tracking responses
>> - */
>> -struct iommu_fault_event {
>> -	struct iommu_fault fault;
>> -	struct list_head list;
>> -};
>> -
> 
> iommu_fault_event is more forward-looking if unrecoverable fault
> will be supported in future. From this angle it might make more
> sense to keep it to replace iopf_fault.

Currently IOMMU drivers use

int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
                        unsigned long iova, int flags)

to report unrecoverable faults. There is no need for a generic fault
event structure.

So alternatively, we can use iopf_fault for now and consolidate a
generic fault data structure when there is a real need.

Best regards,
baolu