From: Jason Gunthorpe <jgg@nvidia.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: dan.j.williams@intel.com,
Jonathan Cameron <jonathan.cameron@huawei.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"will@kernel.org" <will@kernel.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"praan@google.com" <praan@google.com>,
"baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>,
"miko.lenczewski@arm.com" <miko.lenczewski@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
linux-cxl@vger.kernel.org
Subject: Re: [PATCH RFCv1 1/3] PCI: Allow ATS to be always on for CXL.cache capable devices
Date: Thu, 22 Jan 2026 12:58:27 -0400 [thread overview]
Message-ID: <20260122165827.GS1134360@nvidia.com> (raw)
In-Reply-To: <aXJQVprkiMCWxDyp@Asurada-Nvidia>
On Thu, Jan 22, 2026 at 08:29:10AM -0800, Nicolin Chen wrote:
> On Thu, Jan 22, 2026 at 09:14:32AM -0400, Jason Gunthorpe wrote:
> > On Wed, Jan 21, 2026 at 09:44:32PM -0800, dan.j.williams@intel.com wrote:
> > > "We have a less than perfect legacy way (PCI untrusted flag) to nod at
> > > ATS security problems. Let us ignore even that for a new class of
> > > devices that advertise they can trigger all the old security problems
> > > plus new ones."
> >
> > Ah, I missed that we are already force disabling ATS in this untrusted
> > case, so we should ensure that continues to be the case here
> > too. Nicolin does it need a change?
>
> pci_ats_always_on() validates against !pci_ats_supported(pdev), so
> we ensured that untrusted devices would not be always on.
>
> Perhaps we should highlight in the commit message, as it's a topic?
Yes
Jason
next prev parent reply other threads:[~2026-01-22 16:58 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-17 4:56 [PATCH RFCv1 0/3] Allow ATS to be always on for certain ATS-capable devices Nicolin Chen
2026-01-17 4:56 ` [PATCH RFCv1 1/3] PCI: Allow ATS to be always on for CXL.cache capable devices Nicolin Chen
2026-01-19 17:58 ` Jason Gunthorpe
2026-01-21 8:01 ` Tian, Kevin
2026-01-21 10:03 ` Jonathan Cameron
2026-01-21 13:03 ` Jason Gunthorpe
2026-01-22 1:17 ` Baolu Lu
2026-01-22 13:15 ` Jason Gunthorpe
2026-01-22 5:44 ` dan.j.williams
2026-01-22 13:14 ` Jason Gunthorpe
2026-01-22 16:29 ` Nicolin Chen
2026-01-22 16:58 ` Jason Gunthorpe [this message]
2026-01-22 19:46 ` dan.j.williams
2026-01-27 8:10 ` Tian, Kevin
2026-01-27 15:04 ` Jason Gunthorpe
2026-01-28 0:49 ` dan.j.williams
2026-01-28 13:05 ` Jason Gunthorpe
2026-02-03 5:13 ` Nicolin Chen
2026-02-03 14:33 ` Jason Gunthorpe
2026-02-03 17:45 ` Nicolin Chen
2026-02-03 17:55 ` Jason Gunthorpe
2026-02-03 18:50 ` Nicolin Chen
2026-02-04 13:21 ` Jason Gunthorpe
2026-02-03 18:59 ` Robin Murphy
2026-02-03 19:24 ` Nicolin Chen
2026-02-03 23:16 ` Jason Gunthorpe
2026-02-04 12:18 ` Robin Murphy
2026-02-04 13:20 ` Jason Gunthorpe
2026-02-18 22:56 ` Nicolin Chen
2026-02-19 14:37 ` Jason Gunthorpe
2026-02-19 16:53 ` Nicolin Chen
2026-02-19 17:41 ` Jason Gunthorpe
2026-02-20 4:52 ` Nicolin Chen
2026-02-20 12:50 ` Jason Gunthorpe
2026-02-20 13:22 ` Robin Murphy
2026-02-20 13:51 ` Jason Gunthorpe
2026-02-20 14:45 ` Robin Murphy
2026-02-26 15:10 ` Jason Gunthorpe
2026-02-20 18:49 ` Nicolin Chen
2026-02-24 14:38 ` Jason Gunthorpe
2026-01-28 0:57 ` Tian, Kevin
2026-01-28 13:11 ` Jason Gunthorpe
2026-01-29 3:28 ` Tian, Kevin
2026-01-22 10:24 ` Alejandro Lucero Palau
2026-01-17 4:56 ` [PATCH RFCv1 2/3] PCI: Allow ATS to be always on for non-CXL NVIDIA GPUs Nicolin Chen
2026-01-19 18:00 ` Jason Gunthorpe
2026-01-19 18:09 ` Nicolin Chen
2026-01-17 4:56 ` [PATCH RFCv1 3/3] iommu/arm-smmu-v3: Allow ATS to be always on Nicolin Chen
2026-01-19 20:06 ` Jason Gunthorpe
2026-01-26 12:39 ` Will Deacon
2026-01-26 17:20 ` Jason Gunthorpe
2026-01-26 18:40 ` Nicolin Chen
2026-01-26 19:16 ` Jason Gunthorpe
2026-01-26 18:49 ` Robin Murphy
2026-01-26 19:09 ` Jason Gunthorpe
2026-01-27 13:10 ` Will Deacon
2026-01-27 13:26 ` Robin Murphy
2026-01-27 13:50 ` Will Deacon
2026-01-27 14:49 ` Jason Gunthorpe
2026-01-26 18:21 ` Nicolin Chen
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