diff --git a/UPDATING b/UPDATING
--- a/UPDATING
+++ b/UPDATING
@@ -27,6 +27,10 @@
 	world, or to merely disable the most expensive debugging functionality
 	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20230113:
+	LinuxKPI pci.h changes may require out-of-tree drivers to be recompiled.
+	Bump _FreeBSD_version to 1400078 to be able to detect this change.
+
 20221212:
 	llvm-objump is now always installed as objdump.  Previously there was
 	no /usr/bin/objdump unless the WITH_LLVM_BINUTILS knob was used.
diff --git a/sys/compat/linuxkpi/common/include/linux/interrupt.h b/sys/compat/linuxkpi/common/include/linux/interrupt.h
--- a/sys/compat/linuxkpi/common/include/linux/interrupt.h
+++ b/sys/compat/linuxkpi/common/include/linux/interrupt.h
@@ -131,6 +131,13 @@
 	return (-error);
 }
 
+static inline struct msi_desc *
+irq_get_msi_desc(unsigned int irq)
+{
+
+	return (lkpi_pci_msi_desc_alloc(irq));
+}
+
 /*
  * LinuxKPI tasklet support
  */
diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
--- a/sys/compat/linuxkpi/common/include/linux/pci.h
+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
@@ -285,6 +285,17 @@
 module_init(_pci_init);							\
 module_exit(_pci_exit)
 
+struct msi_msg {
+	uint32_t			data;
+};
+
+struct msi_desc {
+	struct msi_msg			msg;
+	struct {
+		bool			is_64;
+	} msi_attrib;
+};
+
 /*
  * If we find drivers accessing this from multiple KPIs we may have to
  * refcount objects of this structure.
@@ -311,12 +322,18 @@
 	unsigned int		devfn;
 	uint32_t		class;
 	uint8_t			revision;
+	uint8_t			msi_cap;
 	bool			managed;	/* devres "pcim_*(). */
 	bool			want_iomap_res;
 	bool			msi_enabled;
 	bool			msix_enabled;
 	phys_addr_t		rom;
 	size_t			romlen;
+	/*
+	 * msi_desc should be an array one day? For as long as we only support
+	 * 1 MSI vector this is fine.
+	 */
+	struct msi_desc		*msi_desc;
 
 	TAILQ_HEAD(, pci_mmio_region)	mmio;
 };
@@ -345,6 +362,7 @@
 struct pcim_iomap_devres *lkpi_pcim_iomap_devres_find(struct pci_dev *pdev);
 void lkpi_pcim_iomap_table_release(struct device *, void *);
 struct pci_dev *lkpi_pci_get_device(uint16_t, uint16_t, struct pci_dev *);
+struct msi_desc *lkpi_pci_msi_desc_alloc(int);
 
 static inline bool
 dev_is_pci(struct device *dev)
diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
--- a/sys/compat/linuxkpi/common/src/linux_pci.c
+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
@@ -339,6 +339,8 @@
 	if (pdev->bus->self != pdev)
 		pci_dev_put(pdev->bus->self);
 	free(pdev->bus, M_DEVBUF);
+	if (pdev->msi_desc != NULL)
+		free(pdev->msi_desc, M_DEVBUF);
 	free(pdev, M_DEVBUF);
 }
 
@@ -965,6 +967,35 @@
 	return (-EINVAL);
 }
 
+struct msi_desc *
+lkpi_pci_msi_desc_alloc(int irq)
+{
+	struct device *dev;
+	struct pci_dev *pdev;
+	struct msi_desc *desc;
+	struct pci_devinfo *dinfo;
+	struct pcicfg_msi *msi;
+
+	dev = linux_pci_find_irq_dev(irq);
+	if (dev == NULL)
+		return (NULL);
+
+	pdev = to_pci_dev(dev);
+	if (pdev->msi_desc != NULL)
+		return (pdev->msi_desc);
+
+	dinfo = device_get_ivars(dev->bsddev);
+	msi = &dinfo->cfg.msi;
+
+	desc = malloc(sizeof(*desc), M_DEVBUF, M_WAITOK | M_ZERO);
+
+	desc->msi_attrib.is_64 =
+	   (msi->msi_ctrl & PCIM_MSICTRL_64BIT) ? true : false;
+	desc->msg.data = msi->msi_data;
+
+	return (desc);
+}
+
 CTASSERT(sizeof(dma_addr_t) <= sizeof(uint64_t));
 
 struct linux_dma_obj {
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -76,7 +76,7 @@
  * cannot include sys/param.h and should only be updated here.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1400077
+#define __FreeBSD_version 1400078
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,