linux-kernel - [RFC PATCH V3 22/26] vfio/pci: Introduce backend specific context initializer

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Date:   Fri, 27 Oct 2023 10:00:54 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     jgg@...dia.com, yishaih@...dia.com,
        shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
        alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, dave.jiang@...el.com, jing2.liu@...el.com,
        ashok.raj@...el.com, fenghua.yu@...el.com,
        tom.zanussi@...ux.intel.com, reinette.chatre@...el.com,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: [RFC PATCH V3 22/26] vfio/pci: Introduce backend specific context initializer

The per-interrupt context may contain backend specific data.

Call a backend provided initializer on per-interrupt context
creation.

Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
---
Changes since RFC V2:
- New patch

 drivers/vfio/pci/vfio_pci_intrs.c | 8 ++++++++
 include/linux/vfio_pci_core.h     | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 1e6376b048de..8c86f2d6229f 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -73,6 +73,14 @@ vfio_irq_ctx_alloc(struct vfio_pci_intr_ctx *intr_ctx, unsigned long index)
 	if (!ctx)
 		return NULL;
 
+	if (intr_ctx->ops->init_irq_ctx) {
+		ret = intr_ctx->ops->init_irq_ctx(intr_ctx, ctx);
+		if (ret < 0) {
+			kfree(ctx);
+			return NULL;
+		}
+	}
+
 	ret = xa_insert(&intr_ctx->ctx, index, ctx, GFP_KERNEL_ACCOUNT);
 	if (ret) {
 		kfree(ctx);
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index f0951084a26f..d5140a732741 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -106,6 +106,8 @@ struct vfio_pci_intr_ops {
 				   unsigned int vector);
 	char *(*msi_device_name)(struct vfio_pci_intr_ctx *intr_ctx,
 				 unsigned int vector, unsigned int index);
+	int (*init_irq_ctx)(struct vfio_pci_intr_ctx *intr_ctx,
+			    struct vfio_pci_irq_ctx *ctx);
 };
 
 struct vfio_pci_core_device {
-- 
2.34.1