@@ -37,6 +37,27 @@ struct vfio_pci_ims_ctx {
union msi_instance_cookie icookie;
};
+/*
+ * Return IMS index of IMS interrupt backing MSI-X interrupt @vector
+ */
+int vfio_pci_ims_hwirq(struct vfio_device *vdev, unsigned int vector)
+{
+ struct vfio_pci_ims *ims = &vdev->ims;
+ struct vfio_pci_ims_ctx *ctx;
+ int id;
+
+ mutex_lock(&ims->ctx_mutex);
+ ctx = xa_load(&ims->ctx, vector);
+ if (!ctx || ctx->emulated)
+ id = -EINVAL;
+ else
+ id = ctx->ims_id;
+ mutex_unlock(&ims->ctx_mutex);
+
+ return id;
+}
+EXPORT_SYMBOL_GPL(vfio_pci_ims_hwirq);
+
/*
* Send signal to the eventfd.
* @vdev: VFIO device
@@ -339,6 +339,7 @@ int vfio_pci_ims_set_emulated(struct vfio_device *vdev, unsigned int start,
void vfio_pci_ims_send_signal(struct vfio_device *vdev, unsigned int vector);
int vfio_pci_ims_set_cookie(struct vfio_device *vdev, unsigned int vector,
union msi_instance_cookie *icookie);
+int vfio_pci_ims_hwirq(struct vfio_device *vdev, unsigned int vector);
#else
static inline int vfio_pci_set_ims_trigger(struct vfio_device *vdev,
unsigned int index,
@@ -374,6 +375,12 @@ static inline int vfio_pci_ims_set_cookie(struct vfio_device *vdev,
return -EOPNOTSUPP;
}
+static inline int vfio_pci_ims_hwirq(struct vfio_device *vdev,
+ unsigned int index)
+{
+ return -EOPNOTSUPP;
+}
+
#endif /* CONFIG_VFIO_PCI_IMS */
#endif /* VFIO_H */
A virtual device driver needs to facilitate translation between the guest's MSI-X interrupt and the backing IMS interrupt with which the physical device is programmed. For example, the guest may need to obtain the IMS index from the virtual device driver that it needs to program into descriptors submitted to the device to ensure that the completion interrupts are generated correctly. Introduce vfio_pci_ims_hwirq() to VFIO PCI IMS as a helper that returns the IMS interrupt index backing a provided MSI-X interrupt index belonging to a guest. Originally-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> --- drivers/vfio/pci/vfio_pci_ims.c | 21 +++++++++++++++++++++ include/linux/vfio.h | 7 +++++++ 2 files changed, 28 insertions(+)