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vfio: add device IO ops vector

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For vfio-user, device operations such as IRQ handling and region
read/writes are implemented in userspace over the control socket, not
ioctl() to the vfio kernel driver; add an ops vector to generalize this,
and implement vfio_device_io_ops_ioctl for interacting with the kernel
vfio driver.

Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250507152020.1254632-11-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
John Levon 2025-05-07 16:20:15 +01:00 • committed by Cédric Le Goater
parent 9458d9b4dc
commit 38bf025d0d
5 changed files with 114 additions and 27 deletions
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10
hw/vfio/pci.c
View file

@ -381,7 +381,7 @@ static void vfio_msi_interrupt(void *opaque)
static int vfio_enable_msix_no_vec(VFIOPCIDevice *vdev)
{
g_autofree struct vfio_irq_set *irq_set = NULL;
int ret = 0, argsz;
int argsz;
int32_t *fd;
argsz = sizeof(*irq_set) + sizeof(*fd);
@ -396,9 +396,7 @@ static int vfio_enable_msix_no_vec(VFIOPCIDevice *vdev)
fd = (int32_t *)&irq_set->data;
*fd = -1;
ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
return ret < 0 ? -errno : ret;
return vdev->vbasedev.io_ops->set_irqs(&vdev->vbasedev, irq_set);
}
static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
@ -455,11 +453,11 @@ static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
fds[i] = fd;
}
ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
ret = vdev->vbasedev.io_ops->set_irqs(&vdev->vbasedev, irq_set);
g_free(irq_set);
return ret < 0 ? -errno : ret;
return ret;
}
static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,