linux-kernel - [patch 0/8] PCI/MSI, x86: Cure a couple of inconsistencies

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Date:   Wed, 21 Jul 2021 21:11:26 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Kevin Tian <kevin.tian@...el.com>,
        Marc Zyngier <maz@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        x86@...nel.org
Subject: [patch 0/8] PCI/MSI, x86: Cure a couple of inconsistencies

A recent discussion about the PCI/MSI management for virtio unearthed a
violation of the MSI-X specification vs. writing the MSI-X message: under
certain circumstances the entry is written without being masked.

While looking at that and the related violation of the x86 non-remapped
interrupt affinity mechanism a few other issues were discovered by
inspection.

The following series addresses these.

Note this does not fix the virtio issue, but while staring at the above
problems I came up with a plan to address this. I'm still trying to
convince myself that I can get away without sprinkling locking all over the
place, so don't hold your breath that this will materialize tomorrow.

The series is also available from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git irq/msi

Thanks,

	tglx
---
 arch/x86/kernel/apic/io_apic.c |    6 +-
 arch/x86/kernel/apic/msi.c     |   11 +++-
 arch/x86/kernel/hpet.c         |    2 
 drivers/pci/msi.c              |   98 +++++++++++++++++++++++++++--------------
 include/linux/irq.h            |    2 
 kernel/irq/chip.c              |    5 +-
 6 files changed, 85 insertions(+), 39 deletions(-)