linux-kernel - Re: [PATCH 06/12] iommu/vt-d: Acquiring lock in domain ID allocation helpers

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: <369bf961-d5e5-998f-542d-f90bc4c6cb28@linux.intel.com>
Date:   Wed, 1 Jun 2022 18:38:44 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     baolu.lu@...ux.intel.com, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/12] iommu/vt-d: Acquiring lock in domain ID allocation
 helpers

Hi Kevin,

Thank you for the comments.

On 2022/6/1 17:09, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Friday, May 27, 2022 2:30 PM
>>
>> The iommu->lock is used to protect the per-IOMMU domain ID resource.
>> Move the spinlock acquisition/release into the helpers where domain
>> IDs are allocated and freed. The device_domain_lock is irrelevant to
>> domain ID resources, remove its assertion as well.
> while moving the lock you also replace spin_lock_irqsave() with spin_lock().
> It'd be cleaner to just do movement here and then replace all _irqsave()
> in patch 8.

Yeah, that will be clearer.

Best regards,
baolu