From: Baolu Lu <baolu.lu@linux.intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
iommu@lists.linux.dev, Jason Gunthorpe <jgg@nvidia.com>,
Joerg Roedel <joro@8bytes.org>,
dmaengine@vger.kernel.org, vkoul@kernel.org
Cc: baolu.lu@linux.intel.com, Robin Murphy <robin.murphy@arm.com>,
Will Deacon <will@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Raj Ashok <ashok.raj@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Tony Luck <tony.luck@intel.com>,
"Zanussi, Tom" <tom.zanussi@intel.com>
Subject: Re: [PATCH v2 1/8] iommu/vt-d: Use non-privileged mode for all PASIDs
Date: Tue, 28 Mar 2023 12:55:16 +0800 [thread overview]
Message-ID: <8839763d-8a40-caad-4048-0d335fb3beb9@linux.intel.com> (raw)
In-Reply-To: <20230327232138.1490712-2-jacob.jun.pan@linux.intel.com>
On 3/28/23 7:21 AM, Jacob Pan wrote:
> Supervisor Request Enable (SRE) bit in a PASID entry is for permission
> checking on DMA requests. When SRE = 0, DMA with supervisor privilege
> will be blocked. However, for in-kernel DMA this is not necessary in that
> we are targeting kernel memory anyway. There's no need to differentiate
> user and kernel for in-kernel DMA.
>
> Let's use non-privileged (user) permission for all PASIDs used in kernel,
> it will be consistent with DMA without PASID (RID_PASID) as well.
>
> Signed-off-by: Jacob Pan<jacob.jun.pan@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards,
baolu
next prev parent reply other threads:[~2023-03-28 4:56 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-27 23:21 [PATCH v2 0/8] Re-enable IDXD kernel workqueue under DMA API Jacob Pan
2023-03-27 23:21 ` [PATCH v2 1/8] iommu/vt-d: Use non-privileged mode for all PASIDs Jacob Pan
2023-03-28 4:55 ` Baolu Lu [this message]
2023-03-27 23:21 ` [PATCH v2 2/8] iommu/vt-d: Remove PASID supervisor request support Jacob Pan
2023-03-28 4:59 ` Baolu Lu
2023-03-27 23:21 ` [PATCH v2 3/8] iommu/sva: Support reservation of global SVA PASIDs Jacob Pan
2023-03-28 5:11 ` Baolu Lu
2023-03-28 15:21 ` Jacob Pan
2023-03-28 7:35 ` Tian, Kevin
2023-03-28 15:31 ` Jacob Pan
2023-03-28 15:55 ` Jason Gunthorpe
2023-03-28 16:32 ` Jacob Pan
2023-03-27 23:21 ` [PATCH v2 4/8] iommu/vt-d: Reserve RID_PASID from global SVA PASID space Jacob Pan
2023-03-28 5:20 ` Baolu Lu
2023-03-28 16:29 ` Jacob Pan
2023-03-28 20:52 ` Jacob Pan
2023-03-29 6:13 ` Baolu Lu
2023-03-29 8:20 ` Vasant Hegde
2023-03-27 23:21 ` [PATCH v2 5/8] iommu/vt-d: Make device pasid attachment explicit Jacob Pan
2023-03-28 5:49 ` Baolu Lu
2023-03-28 7:44 ` Tian, Kevin
2023-03-28 20:39 ` Jacob Pan
2023-03-29 6:18 ` Baolu Lu
2023-03-27 23:21 ` [PATCH v2 6/8] iommu/vt-d: Implement set_dev_pasid domain op Jacob Pan
2023-03-28 7:47 ` Tian, Kevin
2023-03-28 15:40 ` Jacob Pan
2023-03-29 3:04 ` Tian, Kevin
2023-03-29 6:22 ` Baolu Lu
2023-03-27 23:21 ` [PATCH v2 7/8] iommu: Export iommu_get_dma_domain Jacob Pan
2023-03-28 6:04 ` Baolu Lu
2023-03-28 7:52 ` Tian, Kevin
2023-03-28 15:48 ` Jacob Pan
2023-03-28 16:19 ` Jason Gunthorpe
2023-03-28 17:25 ` Jacob Pan
2023-03-28 15:48 ` Jacob Pan
2023-03-29 6:28 ` Baolu Lu
2023-03-27 23:21 ` [PATCH v2 8/8] dmaengine/idxd: Re-enable kernel workqueue under DMA API Jacob Pan
2023-03-28 18:16 ` Fenghua Yu
2023-03-28 20:23 ` Jacob Pan
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