linux-kernel - RE: [PATCH v2 2/8] iommu: Add attach/detach_dev

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: <BN9PR11MB52762F97E491B6A8541D38BD8C109@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 15 Mar 2022 10:24:49 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH v2 2/8] iommu: Add attach/detach_dev_pasid domain ops

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Tuesday, March 15, 2022 1:07 PM
> 
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> An IOMMU domain represents an address space which can be attached by
> devices that perform DMA within a domain. However, for platforms with
> PASID capability the domain attachment needs be handled at device+PASID
> level. There can be multiple PASIDs within a device and multiple devices
> attached to a given domain.
> This patch introduces a new IOMMU op which support device, PASID, and
> IOMMU domain attachment. The immediate use case is for PASID capable
> devices to perform DMA under DMA APIs.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  include/linux/iommu.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 369f05c2a4e2..fde5b933dbe3 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -227,6 +227,8 @@ struct iommu_iotlb_gather {
>   * @aux_get_pasid: get the pasid given an aux-domain
>   * @sva_bind: Bind process address space to device
>   * @sva_unbind: Unbind process address space from device
> + * @attach_dev_pasid: attach an iommu domain to a pasid of device
> + * @detach_dev_pasid: detach an iommu domain from a pasid of device
>   * @sva_get_pasid: Get PASID associated to a SVA handle
>   * @page_response: handle page request response
>   * @cache_invalidate: invalidate translation caches
> @@ -296,6 +298,10 @@ struct iommu_ops {
>  	struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct
> *mm,
>  				      void *drvdata);
>  	void (*sva_unbind)(struct iommu_sva *handle);
> +	int (*attach_dev_pasid)(struct iommu_domain *domain,
> +				struct device *dev, ioasid_t id);
> +	void (*detach_dev_pasid)(struct iommu_domain *domain,
> +				 struct device *dev, ioasid_t id);
>  	u32 (*sva_get_pasid)(struct iommu_sva *handle);
> 
>  	int (*page_response)(struct device *dev,
> --
> 2.25.1

Probably this can be combined with patch05 to demonstrate the usage
together with the definition of the new ops. Then comes the vt-d specific
change.

Thanks
Kevin