From: Yi Liu <yi.l.liu@intel•com>
To: Jason Gunthorpe <jgg@nvidia•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: Fri, 22 May 2026 17:18:21 +0800 [thread overview]
Message-ID: <ad25c3aa-567a-4bcb-a3a9-decef7313a2a@intel.com> (raw)
In-Reply-To: <20260521130544.GE3602937@nvidia.com>
On 5/21/26 21:05, Jason Gunthorpe wrote:
> On Thu, May 21, 2026 at 03:31:46PM +0800, Yi Liu wrote:
>
>> Does this hardware behavior satisfy the security expectation you have in
>> mind? Or do you still require that both the DTE bit and the PCI ATS
>> capability be explicitly disabled when a blocking domain is in effect?
>
> If the HW rejects translated TLPs then you should be clearing the ATS
> enable bit in the device config space prior to rejecting them
>
> But it does seem secure enough as-is.
got it. thanks for the thoughts.
next prev parent reply other threads:[~2026-05-22 9:14 UTC|newest]
Thread overview: 30+ 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
2026-05-21 7:31 ` Yi Liu
2026-05-21 13:05 ` Jason Gunthorpe
2026-05-22 9:18 ` Yi Liu [this message]
2026-05-25 6:58 ` Tian, Kevin
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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