@@ -1,11 +1,13 @@
/*
* QEMU VFIO helpers
*
- * Copyright 2016 - 2018 Red Hat, Inc.
+ * Copyright 2016 - 2020 Red Hat, Inc.
*
* Authors:
* Fam Zheng <famz@redhat.com>
+ * Philippe Mathieu-Daudé <philmd@redhat.com>
*
+ * SPDX-License-Identifier: GPL-2.0-or-later
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
@@ -28,5 +30,7 @@ void qemu_vfio_pci_unmap_bar(QEMUVFIOState *s, int index, void *bar,
uint64_t offset, uint64_t size);
int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e,
int irq_type, Error **errp);
+int qemu_vfio_pci_init_msix_irqs(QEMUVFIOState *s, EventNotifier *e,
+ unsigned *irq_count, Error **errp);
#endif
@@ -1,11 +1,13 @@
/*
* VFIO utility
*
- * Copyright 2016 - 2018 Red Hat, Inc.
+ * Copyright 2016 - 2020 Red Hat, Inc.
*
* Authors:
* Fam Zheng <famz@redhat.com>
+ * Philippe Mathieu-Daudé <philmd@redhat.com>
*
+ * SPDX-License-Identifier: GPL-2.0-or-later
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
@@ -216,6 +218,67 @@ int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e,
return 0;
}
+/**
+ * Initialize device MSIX IRQs and register event notifiers.
+ * @irq_count: pointer to number of MSIX IRQs to initialize
+ * @notifier: Array of @irq_count notifiers (each corresponding to a MSIX IRQ)
+
+ * If the number of IRQs requested exceeds the available on the device,
+ * store the number of available IRQs in @irq_count and return -EOVERFLOW.
+ */
+int qemu_vfio_pci_init_msix_irqs(QEMUVFIOState *s, EventNotifier *notifier,
+ unsigned *irq_count, Error **errp)
+{
+ int r;
+ size_t irq_set_size;
+ struct vfio_irq_set *irq_set;
+ struct vfio_irq_info irq_info = {
+ .argsz = sizeof(irq_info),
+ .index = VFIO_PCI_MSIX_IRQ_INDEX
+ };
+
+ if (ioctl(s->device, VFIO_DEVICE_GET_IRQ_INFO, &irq_info)) {
+ error_setg_errno(errp, errno, "Failed to get device interrupt info");
+ return -errno;
+ }
+ if (irq_info.count < *irq_count) {
+ error_setg(errp, "Not enough device interrupts available");
+ *irq_count = irq_info.count;
+ return -EOVERFLOW;
+ }
+ if (!(irq_info.flags & VFIO_IRQ_INFO_EVENTFD)) {
+ error_setg(errp, "Device interrupt doesn't support eventfd");
+ return -EINVAL;
+ }
+
+ irq_set_size = sizeof(*irq_set) + *irq_count * sizeof(int32_t);
+ irq_set = g_malloc0(irq_set_size);
+
+ /* Get to a known IRQ state */
+ *irq_set = (struct vfio_irq_set) {
+ .argsz = irq_set_size,
+ .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER,
+ .index = irq_info.index,
+ .start = 0,
+ .count = *irq_count,
+ };
+
+ for (unsigned i = 0; i < *irq_count; i++) {
+ ((int32_t *)&irq_set->data)[i] = event_notifier_get_fd(¬ifier[i]);
+ }
+ r = ioctl(s->device, VFIO_DEVICE_SET_IRQS, irq_set);
+ g_free(irq_set);
+ if (r <= 0) {
+ error_setg_errno(errp, errno, "Failed to setup device interrupts");
+ return -errno;
+ } else if (r < *irq_count) {
+ error_setg(errp, "Not enough device interrupts available");
+ *irq_count = r;
+ return -EOVERFLOW;
+ }
+ return 0;
+}
+
static int qemu_vfio_pci_read_config(QEMUVFIOState *s, void *buf,
int size, int ofs)
{
qemu_vfio_pci_init_irq() allows us to initialize any type of IRQ, but only one. Introduce qemu_vfio_pci_init_msix_irqs() which is specific to MSIX IRQ type, and allow us to use multiple IRQs (thus passing multiple eventfd notifiers). Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> --- include/qemu/vfio-helpers.h | 6 +++- util/vfio-helpers.c | 65 ++++++++++++++++++++++++++++++++++++- 2 files changed, 69 insertions(+), 2 deletions(-)