linux-kernel - Re: [RFC 04/20] iommu: Add iommu_device_get

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: <ba0a7369-c115-2df5-e2bb-bd65ca20a0dc@linux.intel.com>
Date:   Wed, 29 Sep 2021 17:29:17 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     David Gibson <david@...son.dropbear.id.au>,
        Liu Yi L <yi.l.liu@...el.com>
Cc:     baolu.lu@...ux.intel.com, alex.williamson@...hat.com,
        jgg@...dia.com, hch@....de, jasowang@...hat.com, joro@...tes.org,
        jean-philippe@...aro.org, kevin.tian@...el.com, parav@...lanox.com,
        lkml@...ux.net, pbonzini@...hat.com, lushenming@...wei.com,
        eric.auger@...hat.com, corbet@....net, ashok.raj@...el.com,
        yi.l.liu@...ux.intel.com, jun.j.tian@...el.com, hao.wu@...el.com,
        dave.jiang@...el.com, jacob.jun.pan@...ux.intel.com,
        kwankhede@...dia.com, robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, nicolinc@...dia.com
Subject: Re: [RFC 04/20] iommu: Add iommu_device_get_info interface

On 2021/9/29 17:25, Lu Baolu wrote:
> Hi David,
> 
> On 2021/9/29 10:52, David Gibson wrote:
>> On Sun, Sep 19, 2021 at 02:38:32PM +0800, Liu Yi L wrote:
>>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>>>
>>> This provides an interface for upper layers to get the per-device iommu
>>> attributes.
>>>
>>>      int iommu_device_get_info(struct device *dev,
>>>                                enum iommu_devattr attr, void *data);
>> That fact that this interface doesn't let you know how to size the
>> data buffer, other than by just knowing the right size for each attr
>> concerns me.
>>
> 
> We plan to address this by following the comments here.
> 
> https://lore.kernel.org/linux-iommu/20210921161930.GP327412@nvidia.com/

And Christoph gave another option as well.

https://lore.kernel.org/linux-iommu/20210922050746.GA12921@lst.de/

Best regards,
baolu