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 <phi...@redhat.com> --- include/qemu/vfio-helpers.h | 2 ++ util/vfio-helpers.c | 53 +++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+) diff --git a/include/qemu/vfio-helpers.h b/include/qemu/vfio-helpers.h index 1f057c2b9e4..63108ebc8da 100644 --- a/include/qemu/vfio-helpers.h +++ b/include/qemu/vfio-helpers.h @@ -28,5 +28,7 @@ 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 diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 696f2d51712..fb3a79a5bcb 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -215,6 +215,59 @@ int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, return 0; } +/** + * Initialize device MSIX IRQs and register event notifiers. + * @irq_count: number of MSIX IRQs to initialize + * @e: Array of @irq_count notifiers (each corresponding to a MSIX IRQ) + */ +int qemu_vfio_pci_init_msix_irqs(QEMUVFIOState *s, EventNotifier *e, + unsigned irq_count, Error **errp) +{ + int r; + struct vfio_irq_set *irq_set; + size_t irq_set_size; + struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) }; + + 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 (only %" PRIu32 ")", + irq_info.count); + return -EINVAL; + } + 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(&e[i]); + } + r = ioctl(s->device, VFIO_DEVICE_SET_IRQS, irq_set); + g_free(irq_set); + if (r) { + error_setg_errno(errp, errno, "Failed to setup device interrupts"); + return -errno; + } + return 0; +} + static int qemu_vfio_pci_read_config(QEMUVFIOState *s, void *buf, int size, int ofs) { -- 2.26.2