linux-kernel - [PATCH v0 05/15] mshv: Declarations and definitions for VFIO-MSHV bridge device

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Message-ID: <20260120064230.3602565-6-mrathor@linux.microsoft.com>
Date: Mon, 19 Jan 2026 22:42:20 -0800
From: Mukesh R <mrathor@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
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Subject: [PATCH v0 05/15] mshv: Declarations and definitions for VFIO-MSHV bridge device

From: Mukesh Rathor <mrathor@...ux.microsoft.com>

Add data structs needed by the subsequent patch that introduces a new
module to implement VFIO-MSHV pseudo device.

Signed-off-by: Mukesh Rathor <mrathor@...ux.microsoft.com>
---
 drivers/hv/mshv_root.h    | 23 +++++++++++++++++++++++
 include/uapi/linux/mshv.h | 31 +++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h
index c3753b009fd8..42e1da1d545b 100644
--- a/drivers/hv/mshv_root.h
+++ b/drivers/hv/mshv_root.h
@@ -220,6 +220,29 @@ struct port_table_info {
 	};
 };
 
+struct mshv_device {
+	const struct mshv_device_ops *device_ops;
+	struct mshv_partition *device_pt;
+	void *device_private;
+	struct hlist_node device_ptnode;
+};
+
+struct mshv_device_ops {
+	const char *device_name;
+	long (*device_create)(struct mshv_device *dev, u32 type);
+	void (*device_release)(struct mshv_device *dev);
+	long (*device_set_attr)(struct mshv_device *dev,
+				struct mshv_device_attr *attr);
+	long (*device_has_attr)(struct mshv_device *dev,
+				struct mshv_device_attr *attr);
+};
+
+extern struct mshv_device_ops mshv_vfio_device_ops;
+int mshv_vfio_ops_init(void);
+void mshv_vfio_ops_exit(void);
+long mshv_partition_ioctl_create_device(struct mshv_partition *partition,
+					void __user *user_args);
+
 int mshv_update_routing_table(struct mshv_partition *partition,
 			      const struct mshv_user_irq_entry *entries,
 			      unsigned int numents);
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index dee3ece28ce5..b7b10f9e2896 100644
--- a/include/uapi/linux/mshv.h
+++ b/include/uapi/linux/mshv.h
@@ -252,6 +252,7 @@ struct mshv_root_hvcall {
 #define MSHV_GET_GPAP_ACCESS_BITMAP	_IOWR(MSHV_IOCTL, 0x06, struct mshv_gpap_access_bitmap)
 /* Generic hypercall */
 #define MSHV_ROOT_HVCALL		_IOWR(MSHV_IOCTL, 0x07, struct mshv_root_hvcall)
+#define MSHV_CREATE_DEVICE		_IOWR(MSHV_IOCTL, 0x08, struct mshv_create_device)
 
 /*
  ********************************
@@ -402,4 +403,34 @@ struct mshv_sint_mask {
 /* hv_hvcall device */
 #define MSHV_HVCALL_SETUP        _IOW(MSHV_IOCTL, 0x1E, struct mshv_vtl_hvcall_setup)
 #define MSHV_HVCALL              _IOWR(MSHV_IOCTL, 0x1F, struct mshv_vtl_hvcall)
+
+/* device passhthru */
+#define MSHV_CREATE_DEVICE_TEST		1
+
+enum {
+	MSHV_DEV_TYPE_VFIO,
+	MSHV_DEV_TYPE_MAX,
+};
+
+struct mshv_create_device {
+	__u32	type;	     /* in: MSHV_DEV_TYPE_xxx */
+	__u32	fd;	     /* out: device handle */
+	__u32	flags;	     /* in: MSHV_CREATE_DEVICE_xxx */
+};
+
+#define MSHV_DEV_VFIO_FILE      1
+#define MSHV_DEV_VFIO_FILE_ADD	1
+#define MSHV_DEV_VFIO_FILE_DEL	2
+
+struct mshv_device_attr {
+	__u32	flags;		/* no flags currently defined */
+	__u32	group;		/* device-defined */
+	__u64	attr;		/* group-defined */
+	__u64	addr;		/* userspace address of attr data */
+};
+
+/* Device fds created with MSHV_CREATE_DEVICE */
+#define MSHV_SET_DEVICE_ATTR	_IOW(MSHV_IOCTL, 0x00, struct mshv_device_attr)
+#define MSHV_HAS_DEVICE_ATTR	_IOW(MSHV_IOCTL, 0x01, struct mshv_device_attr)
+
 #endif
-- 
2.51.2.vfs.0.1