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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


  parent reply	other threads:[~2026-08-24 13:43 UTC|newest]

Thread overview: 50+ 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
2026-07-28 22:19   ` sashiko-bot
2026-08-17 21:12   ` Samiullah Khawaja
2026-09-10 23:48   ` Bjorn Helgaas
2026-09-11 16:44     ` David Matlack
2026-07-28 22:09 ` [PATCH v8 02/12] PCI: liveupdate: Track outgoing preserved PCI devices David Matlack
2026-07-28 22:19   ` sashiko-bot
2026-08-24 20:14   ` Samiullah Khawaja
2026-08-27 21:47   ` Bjorn Helgaas
2026-07-28 22:09 ` [PATCH v8 03/12] PCI: liveupdate: Track incoming " David Matlack
2026-07-28 22:22   ` sashiko-bot
2026-07-28 23:37     ` David Matlack
2026-08-24 20:13   ` Samiullah Khawaja
2026-09-10 23:49   ` Bjorn Helgaas
2026-09-11 16:45     ` David Matlack
2026-07-28 22:09 ` [PATCH v8 04/12] PCI: liveupdate: Document driver binding responsibilities David Matlack
2026-07-28 22:12   ` sashiko-bot
2026-09-10 23:50   ` Bjorn Helgaas
2026-07-28 22:09 ` [PATCH v8 05/12] PCI: liveupdate: Preserve bus numbers during Live Update David Matlack
2026-07-28 22:19   ` sashiko-bot
2026-09-10 23:51   ` Bjorn Helgaas
2026-09-11 18:30     ` David Matlack
2026-09-12 17:31       ` David Matlack
2026-07-28 22:10 ` [PATCH v8 06/12] PCI: liveupdate: Auto-preserve upstream bridges across " David Matlack
2026-07-28 22:18   ` sashiko-bot
2026-08-24 13:41   ` Pranjal Shrivastava
2026-09-10 23:51   ` Bjorn Helgaas
2026-09-11 17:00     ` David Matlack
2026-07-28 22:10 ` [PATCH v8 07/12] PCI: Refactor matching logic for pci_dev_acs_ops David Matlack
2026-07-28 22:18   ` sashiko-bot
2026-07-28 22:10 ` [PATCH v8 08/12] PCI: liveupdate: Adopt ACS controls in incoming preserved devices David Matlack
2026-07-28 22:22   ` sashiko-bot
2026-08-24 13:42   ` Pranjal Shrivastava [this message]
2026-09-10 23:51   ` Bjorn Helgaas
2026-09-11 18:31     ` David Matlack
2026-07-28 22:10 ` [PATCH v8 09/12] PCI: liveupdate: Adopt ARI Forwarding Enable on preserved bridges David Matlack
2026-07-28 22:19   ` sashiko-bot
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
2026-07-28 22:21   ` sashiko-bot
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
2026-07-28 22:18   ` sashiko-bot
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
2026-07-28 22:19   ` sashiko-bot
2026-08-24 20:01   ` Samiullah Khawaja
2026-08-18 17:01 ` [PATCH v8 00/12] PCI: liveupdate: PCI core support " David Matlack
2026-09-10 21:37 ` Pasha Tatashin

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