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

Mukesh R
2026-01-20T06:43:39Z

From: Mukesh Rathor <mrathor@linux.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@linux.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