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From: Joerg Roedel <joro@8bytes.org>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
	ashok.raj@intel.com, sanjay.k.kumar@intel.com,
	jacob.jun.pan@intel.com, kevin.tian@intel.com,
	yi.l.liu@intel.com, yi.y.sun@intel.com,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/9] iommu/vt-d: Improve PASID id and table management
Date: Tue, 15 May 2018 16:11:01 +0200	[thread overview]
Message-ID: <20180515141101.GF18595@8bytes.org> (raw)
In-Reply-To: <1525398084-28815-1-git-send-email-baolu.lu@linux.intel.com>

On Fri, May 04, 2018 at 09:41:15AM +0800, Lu Baolu wrote:
> PATCH 4~9 implement per domain PASID table. Current per IOMMU
> PASID table implementation is insecure in the cases where
> multiple devices under one single IOMMU unit support PASID
> feature. With per domain PASID table, we can achieve finer
> protection and isolation granularity.


Hold on, we hat discussions in the past about doing a system-wide pasid
space, so that every mm_struct with devices attached gets the same pasid
across all devices it is talking to. Reason was that some devices (will)
require this to work correctly. This goes into the opposite direction,
so I am a bit confused here. Please explain, is this not longer
necessary?


Regards,

	Joerg

  parent reply	other threads:[~2018-05-15 14:11 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-04  1:41 Lu Baolu
2018-05-04  1:41 ` [PATCH v2 1/9] iommu/vt-d: Global PASID name space Lu Baolu
2018-05-04  1:41 ` [PATCH v2 2/9] iommu/vt-d: Decouple idr bond pointer from svm Lu Baolu
2018-05-04  1:41 ` [PATCH v2 3/9] iommu/vt-d: Use global PASID for SVM usage Lu Baolu
2018-05-04  1:41 ` [PATCH v2 4/9] iommu/vt-d: Move device_domain_info to header Lu Baolu
2018-05-04  1:41 ` [PATCH v2 5/9] iommu/vt-d: Per domain pasid table interfaces Lu Baolu
2018-05-04  1:41 ` [PATCH v2 6/9] iommu/vt-d: Allocate and free pasid table Lu Baolu
2018-05-04  1:41 ` [PATCH v2 7/9] iommu/vt-d: Calculate PTS value Lu Baolu
2018-05-04  1:41 ` [PATCH v2 8/9] iommu/vt-d: Use per-domain pasid table Lu Baolu
2018-05-04  1:41 ` [PATCH v2 9/9] iommu/vt-d: Clean up PASID talbe management for SVM Lu Baolu
2018-05-15 14:11 ` Joerg Roedel [this message]
2018-05-16  8:01   ` [PATCH v2 0/9] iommu/vt-d: Improve PASID id and table management Lu Baolu
2018-05-16  8:56     ` Tian, Kevin
2018-05-17  1:13       ` Lu Baolu
2018-05-29 11:56     ` Joerg Roedel
2018-05-30  0:56       ` Lu Baolu

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