Update with proposed ioeventfd API.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
linux-headers/linux/vfio.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
index 4312e961ffd3..c9d7e2db132e 100644
--- a/linux-headers/linux/vfio.h
+++ b/linux-headers/linux/vfio.h
@@ -503,6 +503,33 @@ struct vfio_pci_hot_reset {
#define VFIO_DEVICE_PCI_HOT_RESET _IO(VFIO_TYPE, VFIO_BASE + 13)
+/**
+ * VFIO_DEVICE_IOEVENTFD - _IOW(VFIO_TYPE, VFIO_BASE + 16,
+ * struct vfio_device_ioeventfd)
+ *
+ * Perform a write to the device at the specified device fd offset, with
+ * the specified data and width when the provided eventfd is triggered.
+ * vfio bus drivers may not support this for all regions, or at all.
+ * vfio-pci currently only enables support for BAR regions and excludes
+ * the MSI-X vector table.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+struct vfio_device_ioeventfd {
+ __u32 argsz;
+ __u32 flags;
+#define VFIO_DEVICE_IOEVENTFD_8 (1 << 0) /* 1-byte write */
+#define VFIO_DEVICE_IOEVENTFD_16 (1 << 1) /* 2-byte write */
+#define VFIO_DEVICE_IOEVENTFD_32 (1 << 2) /* 4-byte write */
+#define VFIO_DEVICE_IOEVENTFD_64 (1 << 3) /* 8-byte write */
+#define VFIO_DEVICE_IOEVENTFD_SIZE_MASK (0xf)
+ __u64 offset; /* device fd offset of write */
+ __u64 data; /* data to be written */
+ __s32 fd; /* -1 for de-assignment */
+};
+
+#define VFIO_DEVICE_IOEVENTFD _IO(VFIO_TYPE, VFIO_BASE + 16)
+
/* -------- API for Type1 VFIO IOMMU -------- */
/**
