linux-kernel - [PATCH v2 8/8] vfio-pci: add module parameter for default moderation mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20251116182839.939139-9-lrizzo@google.com>
Date: Sun, 16 Nov 2025 18:28:39 +0000
From: Luigi Rizzo <lrizzo@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>, 
	Luigi Rizzo <rizzo.unipi@...il.com>, Paolo Abeni <pabeni@...hat.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Sean Christopherson <seanjc@...gle.com>, 
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Willem de Bruijn <willemb@...gle.com>, 
	Luigi Rizzo <lrizzo@...gle.com>
Subject: [PATCH v2 8/8] vfio-pci: add module parameter for default moderation mode

The following module parameter enables moderation at boot time for vfio devices.

vfio_pci_core.soft_moderation=1

It can be overridden at runtime via /proc/irq/*/*vfio*/soft_moderation.
See Documentation/core-api/irq/irq-moderation.rst for configuration.

Change-Id: I69ece365fa8eb796c22e088dbe849eddb684e02a
Signed-off-by: Luigi Rizzo <lrizzo@...gle.com>
---
 drivers/vfio/pci/vfio_pci_intrs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 30d3e921cb0de..e54d88cfe601d 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -22,6 +22,8 @@
 
 #include "vfio_pci_priv.h"
 
+DEFINE_IRQ_MODERATION_MODE_PARAMETER;
+
 struct vfio_pci_irq_ctx {
 	struct vfio_pci_core_device	*vdev;
 	struct eventfd_ctx		*trigger;
@@ -317,6 +319,7 @@ static int vfio_intx_enable(struct vfio_pci_core_device *vdev,
 		vfio_irq_ctx_free(vdev, ctx, 0);
 		return ret;
 	}
+	IRQ_MODERATION_SET_DEFAULT_MODE(pdev->irq);
 
 	return 0;
 }
-- 
2.52.0.rc1.455.g30608eb744-goog