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vfio/ccw: Make vfio cdev pre-openable by passing a file handle

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This gives management tools like libvirt a chance to open the vfio
cdev with privilege and pass FD to qemu. This way qemu never needs
to have privilege to open a VFIO or iommu cdev node.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2023-11-21 16:44:16 +08:00 committed by Cédric Le Goater
parent e70f971a6c
commit 909a6254ed
1 changed files with 22 additions and 3 deletions
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25
hw/vfio/ccw.c
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@ -590,11 +590,12 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
}
}
if (vfio_device_get_name(vbasedev, errp) < 0) {
return;
}
vbasedev->ops = &vfio_ccw_ops;
vbasedev->type = VFIO_DEVICE_TYPE_CCW;
vbasedev->name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
vcdev->cdev.hostid.ssid,
vcdev->cdev.hostid.devid);
vbasedev->dev = dev;
/*
@ -691,12 +692,29 @@ static const VMStateDescription vfio_ccw_vmstate = {
.unmigratable = 1,
};
static void vfio_ccw_instance_init(Object *obj)
{
VFIOCCWDevice *vcdev = VFIO_CCW(obj);
vcdev->vdev.fd = -1;
}
#ifdef CONFIG_IOMMUFD
static void vfio_ccw_set_fd(Object *obj, const char *str, Error **errp)
{
vfio_device_set_fd(&VFIO_CCW(obj)->vdev, str, errp);
}
#endif
static void vfio_ccw_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
device_class_set_props(dc, vfio_ccw_properties);
#ifdef CONFIG_IOMMUFD
object_class_property_add_str(klass, "fd", NULL, vfio_ccw_set_fd);
#endif
dc->vmsd = &vfio_ccw_vmstate;
dc->desc = "VFIO-based subchannel assignment";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
@ -714,6 +732,7 @@ static const TypeInfo vfio_ccw_info = {
.name = TYPE_VFIO_CCW,
.parent = TYPE_S390_CCW,
.instance_size = sizeof(VFIOCCWDevice),
.instance_init = vfio_ccw_instance_init,
.class_init = vfio_ccw_class_init,
};