linux-kernel - [patch 0/3] x86/irq: Bugfix and cleanup for posted MSI interrupts

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Message-ID: <20251125101912.564125647@linutronix.de>
Date: Tue, 25 Nov 2025 11:20:17 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org,
 Luigi Rizzo <lrizzo@...gle.com>,
 Lu Baolu <baolu.lu@...ux.intel.com>,
 Joerg Roedel <joro@...tes.org>
Subject: [patch 0/3] x86/irq: Bugfix and cleanup for posted MSI interrupts

Luigi reported that the retrigger mechanism for posted MSI interrupts is
broken. That happens because retrigger sends an IPI to the actual allocated
vector, which is handled correctly, but lacks an EOI. That leaves a stale
APIC ISR bit around.

The following series addresses this and does some related cleanups in that
area on top.

Thanks,

	tglx
---
 arch/x86/include/asm/irq_remapping.h |   12 ++++++-
 arch/x86/kernel/irq.c                |   54 +++++++++++++++++++++++------------
 drivers/iommu/intel/irq_remapping.c  |   12 +++----
 3 files changed, 52 insertions(+), 26 deletions(-)