From: Jason Gunthorpe <jgg@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: Nicolin Chen <nicolinc@nvidia.com>,
will@kernel.org, robin.murphy@arm.com, bhelgaas@google.com,
joro@8bytes.org, praan@google.com, baolu.lu@linux.intel.com,
kevin.tian@intel.com, miko.lenczewski@arm.com,
linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
dan.j.williams@intel.com, jonathan.cameron@huawei.com,
vsethi@nvidia.com, linux-cxl@vger.kernel.org, nirmoyd@nvidia.com
Subject: Re: [PATCH v4 1/3] PCI: Allow ATS to be always on for CXL.cache capable devices
Date: Wed, 20 May 2026 11:34:10 -0300 [thread overview]
Message-ID: <20260520143410.GV3602937@nvidia.com> (raw)
In-Reply-To: <e8337102-aecd-48e8-9a2d-10f41ed43c5b@intel.com>
On Wed, May 20, 2026 at 09:12:31PM +0800, Yi Liu wrote:
> On 4/27/26 13:54, Nicolin Chen wrote:
> > Controlled by the IOMMU driver, ATS is usually enabled "on demand" when a
> > given PASID on a device is attached to an I/O page table. This is working
> > even when a device has no translation on its RID (i.e., the RID is IOMMU
> > bypassed).
>
> nit: this description seems not accurate. Intel iommu driver enables ATS
> in the probe_device() phase. mind tweak a bit to avoid misleading
> message. :)
It probably shouldn't do this, it should follow ARM and have it
dynamic during domain attach.
For security we need ATS disabled for blocking domains at a minimum.
Jason
next prev parent reply other threads:[~2026-05-20 14:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 5:53 [PATCH v4 0/3] Allow ATS to be always on for certain ATS-capable devices Nicolin Chen
2026-04-27 5:54 ` [PATCH v4 1/3] PCI: Allow ATS to be always on for CXL.cache capable devices Nicolin Chen
2026-04-27 16:31 ` Dave Jiang
2026-04-30 21:41 ` Dan Williams (nvidia)
2026-04-30 23:28 ` Nicolin Chen
2026-05-01 23:27 ` Dan Williams (nvidia)
2026-05-01 23:46 ` Jason Gunthorpe
2026-05-02 0:19 ` Dan Williams (nvidia)
2026-05-19 19:36 ` Bjorn Helgaas
2026-05-19 22:23 ` Jason Gunthorpe
2026-05-19 23:48 ` Bjorn Helgaas
2026-05-20 0:05 ` Jason Gunthorpe
2026-05-20 1:04 ` Nicolin Chen
2026-05-20 14:20 ` Jason Gunthorpe
2026-05-20 17:29 ` Nicolin Chen
2026-05-20 17:47 ` Bjorn Helgaas
2026-05-20 17:56 ` Jason Gunthorpe
2026-05-20 13:12 ` Yi Liu
2026-05-20 14:34 ` Jason Gunthorpe [this message]
2026-04-27 5:54 ` [PATCH v4 2/3] PCI: Allow ATS to be always on for pre-CXL devices Nicolin Chen
2026-04-27 16:32 ` Dave Jiang
2026-05-20 13:12 ` Yi Liu
2026-05-20 17:50 ` Bjorn Helgaas
2026-05-20 17:53 ` Jason Gunthorpe
2026-04-27 5:54 ` [PATCH v4 3/3] iommu/arm-smmu-v3: Allow ATS to be always on Nicolin Chen
2026-04-27 16:37 ` Dave Jiang
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