[v1] vfio queue

[PULL 34/47] vfio/ap: Make vfio cdev pre-openable by passing a file handle

Cédric Le Goater posted 47 patches 11 months, 1 week ago

Diff against v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v1 v2 v2 v2
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Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Yi Liu <yi.l.liu@intel.com>, Eric Auger <eric.auger@redhat.com>, Zhenzhong Duan <zhenzhong.duan@intel.com>, Peter Maydell <peter.maydell@linaro.org>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, David Gibson <david@gibson.dropbear.id.au>, Harsh Prateek Bora <harshpb@linux.ibm.com>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, Tony Krowiak <akrowiak@linux.ibm.com>, Jason Herne <jjherne@linux.ibm.com>, Matthew Rosato <mjrosato@linux.ibm.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>

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[PULL 34/47] vfio/ap: Make vfio cdev pre-openable by passing a file handle

Posted by Cédric Le Goater 11 months, 1 week ago

From: Zhenzhong Duan <zhenzhong.duan@intel.com>

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>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 hw/vfio/ap.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 80629609aebbff9156f78c9bbde5dc6c293ac84e..f180e4a32aa00f391f02e49b6c1bc2e8ebd2fecb 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -160,7 +160,10 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
     VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
     VFIODevice *vbasedev = &vapdev->vdev;
 
-    vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
+    if (vfio_device_get_name(vbasedev, errp) < 0) {
+        return;
+    }
+
     vbasedev->ops = &vfio_ap_ops;
     vbasedev->type = VFIO_DEVICE_TYPE_AP;
     vbasedev->dev = dev;
@@ -230,11 +233,28 @@ static const VMStateDescription vfio_ap_vmstate = {
     .unmigratable = 1,
 };
 
+static void vfio_ap_instance_init(Object *obj)
+{
+    VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj);
+
+    vapdev->vdev.fd = -1;
+}
+
+#ifdef CONFIG_IOMMUFD
+static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp)
+{
+    vfio_device_set_fd(&VFIO_AP_DEVICE(obj)->vdev, str, errp);
+}
+#endif
+
 static void vfio_ap_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_props(dc, vfio_ap_properties);
+#ifdef CONFIG_IOMMUFD
+    object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd);
+#endif
     dc->vmsd = &vfio_ap_vmstate;
     dc->desc = "VFIO-based AP device assignment";
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
@@ -249,6 +269,7 @@ static const TypeInfo vfio_ap_info = {
     .name = TYPE_VFIO_AP_DEVICE,
     .parent = TYPE_AP_DEVICE,
     .instance_size = sizeof(VFIOAPDevice),
+    .instance_init = vfio_ap_instance_init,
     .class_init = vfio_ap_class_init,
 };
 
-- 
2.43.0