Public bug reported:
From: Thomas Lamprecht <t.lampre...@proxmox.com>
Subject: Re: [PATCH 1/1][SRU][N] PCI: Explicitly put devices into D0 when
initializing
...
FYI: This causes regressions on PCI passthrough to QEMU/KVM, among other
things. A colleague found that the following patch on top fixes it here:
commit 907a7a2e5bf40c6a359b2f6cc53d6fdca04009e0
Author: Mario Limonciello <mario.limoncie...@amd.com>
Date: Wed Jun 11 18:31:16 2025 -0500
PCI/PM: Set up runtime PM even for devices without PCI PM
4d4c10f763d7 ("PCI: Explicitly put devices into D0 when initializing")
intended to put PCI devices into D0, but in doing so unintentionally
changed runtime PM initialization not to occur on devices that don't
support PCI PM. This caused a regression in vfio-pci due to an imbalance
with its use.
Adjust the logic in pci_pm_init() so that even if PCI PM isn't supported
runtime PM is still initialized.
Fixes: 4d4c10f763d7 ("PCI: Explicitly put devices into D0 when
initializing")
Reported-by: Giovanni Cabiddu <giovanni.cabi...@intel.com>
Closes:
https://lore.kernel.org/linux-pci/20250424043232.1848107-1-supe...@kernel.org/T/#m7e8929d6421690dc8bd6dc639d86c2b4db27cbc4
Reported-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Closes:
https://lore.kernel.org/linux-pci/20250424043232.1848107-1-supe...@kernel.org/T/#m40d277dcdb9be64a1609a82412d1aa906263e201
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Tested-by: Giovanni Cabiddu <giovanni.cabi...@intel.com>
Tested-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Reviewed-by: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppusw...@linux.intel.com>
Acked-by: Rafael J. Wysocki <raf...@kernel.org>
Cc: Alex Williamson <alex.william...@redhat.com>
Link: https://patch.msgid.link/20250611233117.61810-1-supe...@kernel.org
Same holds for the Plucky backport in patch mail id:
<20250529010730.1863186-2-acelan....@canonical.com>
** Affects: linux (Ubuntu)
Importance: High
Status: Fix Released
** Affects: linux (Ubuntu Noble)
Importance: High
Status: Triaged
** Affects: linux (Ubuntu Plucky)
Importance: High
Status: Triaged
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Plucky)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Noble)
Importance: Undecided => High
** Changed in: linux (Ubuntu Noble)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
** Changed in: linux (Ubuntu Plucky)
Importance: Undecided => High
** Changed in: linux (Ubuntu Plucky)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/2117494
Title:
[Regression Updates] "PCI: Explicitly put devices into D0 when
initializing" breaks pci-pass-through in QEMU/KVM
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