linux-kernel - [PATCH] PCI/MSI: Initialize the prepare descriptor by default

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Message-Id: <20250708051848.3214-1-namjain@linux.microsoft.com>
Date: Tue,  8 Jul 2025 10:48:48 +0530
From: Naman Jain <namjain@...ux.microsoft.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <maz@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Shivamurthy Shastri <shivamurthy.shastri@...utronix.de>,
	Shradha Gupta <shradhagupta@...ux.microsoft.com>
Cc: Naman Jain <namjain@...ux.microsoft.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	Roman Kisel <romank@...ux.microsoft.com>
Subject: [PATCH] PCI/MSI: Initialize the prepare descriptor by default

Plug the default MSI-X prepare descriptor for non-implemented ops by
default to workaround the inability of Hyper-V vPCI module to setup
the MSI-X descriptors properly; especially for dynamically allocated
MSI-X.

Signed-off-by: Naman Jain <namjain@...ux.microsoft.com>
---
 drivers/pci/msi/irqdomain.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index 765312c92d9b..655e99b9c8cc 100644
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -84,6 +84,8 @@ static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
 	} else {
 		if (ops->set_desc == NULL)
 			ops->set_desc = pci_msi_domain_set_desc;
+		if (ops->prepare_desc == NULL)
+			ops->prepare_desc = pci_msix_prepare_desc;
 	}
 }
 

base-commit: 26ffb3d6f02cd0935fb9fa3db897767beee1cb2a
-- 
2.34.1