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vfio/platform: 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: Cédric Le Goater <clg@redhat.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 16:44:12 +08:00 • committed by Cédric Le Goater
parent a6c50e1c3f
commit 3016e60f8f
1 changed files with 24 additions and 8 deletions
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32
hw/vfio/platform.c
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@ -531,14 +531,13 @@ static VFIODeviceOps vfio_platform_ops = {
*/ */
static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp) static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
{ {
struct stat st;
int ret; int ret;
/* @sysfsdev takes precedence over @host */ /* @fd takes precedence over @sysfsdev which takes precedence over @host */
if (vbasedev->sysfsdev) { if (vbasedev->fd < 0 && vbasedev->sysfsdev) {
g_free(vbasedev->name); g_free(vbasedev->name);
vbasedev->name = g_path_get_basename(vbasedev->sysfsdev); vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
} else { } else if (vbasedev->fd < 0) {
if (!vbasedev->name || strchr(vbasedev->name, '/')) { if (!vbasedev->name || strchr(vbasedev->name, '/')) {
error_setg(errp, "wrong host device name"); error_setg(errp, "wrong host device name");
return -EINVAL; return -EINVAL;
@ -548,10 +547,9 @@ static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
vbasedev->name); vbasedev->name);
} }
if (stat(vbasedev->sysfsdev, &st) < 0) { ret = vfio_device_get_name(vbasedev, errp);
error_setg_errno(errp, errno, if (ret) {
"failed to get the sysfs host device file status"); return ret;
return -errno;
} }
ret = vfio_attach_device(vbasedev->name, vbasedev, ret = vfio_attach_device(vbasedev->name, vbasedev,
@ -658,6 +656,20 @@ static Property vfio_platform_dev_properties[] = {
DEFINE_PROP_END_OF_LIST(), DEFINE_PROP_END_OF_LIST(),
}; };
static void vfio_platform_instance_init(Object *obj)
{
VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(obj);
vdev->vbasedev.fd = -1;
}
#ifdef CONFIG_IOMMUFD
static void vfio_platform_set_fd(Object *obj, const char *str, Error **errp)
{
vfio_device_set_fd(&VFIO_PLATFORM_DEVICE(obj)->vbasedev, str, errp);
}
#endif
static void vfio_platform_class_init(ObjectClass *klass, void *data) static void vfio_platform_class_init(ObjectClass *klass, void *data)
{ {
DeviceClass *dc = DEVICE_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass);
@ -665,6 +677,9 @@ static void vfio_platform_class_init(ObjectClass *klass, void *data)
dc->realize = vfio_platform_realize; dc->realize = vfio_platform_realize;
device_class_set_props(dc, vfio_platform_dev_properties); device_class_set_props(dc, vfio_platform_dev_properties);
#ifdef CONFIG_IOMMUFD
object_class_property_add_str(klass, "fd", NULL, vfio_platform_set_fd);
#endif
dc->vmsd = &vfio_platform_vmstate; dc->vmsd = &vfio_platform_vmstate;
dc->desc = "VFIO-based platform device assignment"; dc->desc = "VFIO-based platform device assignment";
sbc->connect_irq_notifier = vfio_start_irqfd_injection; sbc->connect_irq_notifier = vfio_start_irqfd_injection;
@ -677,6 +692,7 @@ static const TypeInfo vfio_platform_dev_info = {
.name = TYPE_VFIO_PLATFORM, .name = TYPE_VFIO_PLATFORM,
.parent = TYPE_SYS_BUS_DEVICE, .parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(VFIOPlatformDevice), .instance_size = sizeof(VFIOPlatformDevice),
.instance_init = vfio_platform_instance_init,
.class_init = vfio_platform_class_init, .class_init = vfio_platform_class_init,
.class_size = sizeof(VFIOPlatformDeviceClass), .class_size = sizeof(VFIOPlatformDeviceClass),
}; };