From: Pranjal Shrivastava <praan@google.com>
To: David Matlack <dmatlack@google.com>
Cc: kexec@lists.infradead.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-pci@vger.kernel.org,
Adithya Jayachandran <ajayachandra@nvidia.com>,
Alexander Graf <graf@amazon.com>,
Alex Williamson <alex@shazbot.org>,
Bjorn Helgaas <bhelgaas@google.com>, Chris Li <chrisl@kernel.org>,
David Rientjes <rientjes@google.com>,
Jacob Pan <jacob.pan@linux.microsoft.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Jonathan Corbet <corbet@lwn.net>, Josh Hilke <jrhilke@google.com>,
Leon Romanovsky <leonro@nvidia.com>,
Lukas Wunner <lukas@wunner.de>, Mike Rapoport <rppt@kernel.org>,
Parav Pandit <parav@nvidia.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Pratyush Yadav <pratyush@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>,
Samiullah Khawaja <skhawaja@google.com>,
Shuah Khan <skhan@linuxfoundation.org>,
Vipin Sharma <vipinsh@google.com>, William Tu <witu@nvidia.com>,
Yi Liu <yi.l.liu@intel.com>
Subject: Re: [PATCH v8 08/12] PCI: liveupdate: Adopt ACS controls in incoming preserved devices
Date: Mon, 24 Aug 2026 13:42:58 +0000 [thread overview]
Message-ID: <aoxKYg_9BXs3U6fN@google.com> (raw)
In-Reply-To: <20260728221007.2098560-9-dmatlack@google.com>
On Tue, Jul 28, 2026 at 10:10:02PM +0000, David Matlack wrote:
> Adopt Access Control Services (ACS) controls on all incoming preserved
> devices (endpoints and upstream bridges) during a Live Update.
>
> Inheriting ACS flags avoids changing routing rules while memory
> transactions are in flight from preserved devices. This is also strictly
> necessary to ensure that IOMMU group assignments do not change during or
> after Live Update.
>
> Cache the inherited ACS controls established by the previous kernel in
> struct pci_dev so that ACS controls do not change after a reset
> (pci_restore_state() calls pci_enable_acs()).
>
> To simplify ACS inheritance, reject preserving any devices that require
> quirks to enable ACS as those quirks would also have to take Live Update
> into account.
>
> Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> Signed-off-by: David Matlack <dmatlack@google.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Thanks,
Praan
next prev parent reply other threads:[~2026-08-24 13:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 22:09 [PATCH v8 00/12] PCI: liveupdate: PCI core support for Live Update David Matlack
2026-07-28 22:09 ` [PATCH v8 01/12] PCI: liveupdate: Set up FLB handler for the PCI core David Matlack
2026-08-17 21:12 ` Samiullah Khawaja
2026-07-28 22:09 ` [PATCH v8 02/12] PCI: liveupdate: Track outgoing preserved PCI devices David Matlack
2026-08-24 20:14 ` Samiullah Khawaja
2026-07-28 22:09 ` [PATCH v8 03/12] PCI: liveupdate: Track incoming " David Matlack
2026-08-24 20:13 ` Samiullah Khawaja
2026-07-28 22:09 ` [PATCH v8 04/12] PCI: liveupdate: Document driver binding responsibilities David Matlack
2026-07-28 22:09 ` [PATCH v8 05/12] PCI: liveupdate: Preserve bus numbers during Live Update David Matlack
2026-07-28 22:10 ` [PATCH v8 06/12] PCI: liveupdate: Auto-preserve upstream bridges across " David Matlack
2026-08-24 13:41 ` Pranjal Shrivastava
2026-07-28 22:10 ` [PATCH v8 07/12] PCI: Refactor matching logic for pci_dev_acs_ops David Matlack
2026-07-28 22:10 ` [PATCH v8 08/12] PCI: liveupdate: Adopt ACS controls in incoming preserved devices David Matlack
2026-08-24 13:42 ` Pranjal Shrivastava [this message]
2026-07-28 22:10 ` [PATCH v8 09/12] PCI: liveupdate: Adopt ARI Forwarding Enable on preserved bridges David Matlack
2026-08-24 13:43 ` Pranjal Shrivastava
2026-07-28 22:10 ` [PATCH v8 10/12] PCI: liveupdate: Freeze preservation status during shutdown David Matlack
2026-08-24 20:07 ` Samiullah Khawaja
2026-07-28 22:10 ` [PATCH v8 11/12] PCI: liveupdate: Do not disable bus mastering on preserved devices during kexec David Matlack
2026-08-24 20:02 ` Samiullah Khawaja
2026-07-28 22:10 ` [PATCH v8 12/12] Documentation: PCI: Add documentation for Live Update David Matlack
2026-08-24 20:01 ` Samiullah Khawaja
2026-08-18 17:01 ` [PATCH v8 00/12] PCI: liveupdate: PCI core support " David Matlack
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