From: Jason Gunthorpe <jgg@nvidia.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Vidya Sagar <vidyas@nvidia.com>,
"corbet@lwn.net" <corbet@lwn.net>,
"bhelgaas@google.com" <bhelgaas@google.com>,
Gal Shalom <galshalom@nvidia.com>,
Leon Romanovsky <leonro@nvidia.com>,
Thierry Reding <treding@nvidia.com>,
Jon Hunter <jonathanh@nvidia.com>,
Masoud Moshref Javadi <mmoshrefjava@nvidia.com>,
Shahaf Shuler <shahafs@nvidia.com>,
Vikram Sethi <vsethi@nvidia.com>,
Shanker Donthineni <sdonthineni@nvidia.com>,
Jiandi An <jan@nvidia.com>, Tushar Dave <tdave@nvidia.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Krishna Thota <kthota@nvidia.com>,
Manikanta Maddireddy <mmaddireddy@nvidia.com>,
"sagar.tv@gmail.com" <sagar.tv@gmail.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>
Subject: Re: [PATCH V3] PCI: Extend ACS configurability
Date: Mon, 10 Jun 2024 08:38:49 -0300 [thread overview]
Message-ID: <20240610113849.GO19897@nvidia.com> (raw)
In-Reply-To: <20240607193055.GA855605@bhelgaas>
On Fri, Jun 07, 2024 at 02:30:55PM -0500, Bjorn Helgaas wrote:
> "Correctly" is not quite the right word here; it's just a fact that
> the ACS settings determined at boot time result in certain IOMMU
> groups. If the user desires different groups, it's not that something
> is "incorrect"; it's just that the user may have to accept less
> isolation to get the desired IOMMU groups.
That is not quite accurate.. There are HW configurations where ACS
needs to be a certain way for the HW to work with P2P at all. It isn't
just an optimization or the user accepts something, if they want P2P
at all they must get a ACS configuration appropriate for their system.
Jason
next prev parent reply other threads:[~2024-06-10 11:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-21 11:09 [PATCH V2] PCI: Extend ACS configurability Vidya Sagar
2024-05-21 15:44 ` kernel test robot
2024-05-23 6:35 ` [PATCH V3] " Vidya Sagar
2024-05-23 14:59 ` Bjorn Helgaas
2024-05-23 15:16 ` Jason Gunthorpe
2024-06-03 7:50 ` Vidya Sagar
2024-06-07 19:30 ` Bjorn Helgaas
2024-06-10 11:38 ` Jason Gunthorpe [this message]
2024-06-12 21:29 ` Bjorn Helgaas
2024-06-12 23:23 ` Jason Gunthorpe
2024-06-13 22:05 ` Bjorn Helgaas
2024-06-13 23:36 ` Jason Gunthorpe
2024-06-13 22:38 ` Alex Williamson
2024-06-12 12:19 ` Jason Gunthorpe
2024-06-25 15:31 ` [PATCH V4] " Vidya Sagar
2024-06-25 16:26 ` Lukas Wunner
2024-06-25 16:39 ` Jason Gunthorpe
2024-06-26 6:02 ` Leon Romanovsky
2024-06-26 7:40 ` Tian, Kevin
2024-06-26 11:50 ` Jason Gunthorpe
2024-07-08 14:39 ` Jason Gunthorpe
2024-07-12 21:57 ` Bjorn Helgaas
2024-09-25 5:06 ` Jiri Slaby
2024-09-25 5:29 ` Jiri Slaby
2024-09-25 5:49 ` Jiri Slaby
2024-10-01 19:33 ` Jason Gunthorpe
2024-10-07 16:36 ` Steffen Dirkwinkel
2024-10-07 20:43 ` Bjorn Helgaas
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