@@ -1868,6 +1868,197 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos)
return 0;
}
+static bool vfio_pci_host_slot_match(PCIHostDeviceAddress *host1,
+ PCIHostDeviceAddress *host2)
+{
+ return (host1->domain == host2->domain && host1->bus == host2->bus &&
+ host1->slot == host2->slot);
+}
+
+static bool vfio_pci_host_match(PCIHostDeviceAddress *host1,
+ PCIHostDeviceAddress *host2)
+{
+ return (vfio_pci_host_slot_match(host1, host2) &&
+ host1->function == host2->function);
+}
+
+struct VFIODeviceFind {
+ PCIDevice *pdev;
+ bool found;
+};
+
+static void vfio_check_device_noreset(PCIBus *bus, PCIDevice *pdev,
+ void *opaque)
+{
+ DeviceState *dev = DEVICE(pdev);
+ DeviceClass *dc = DEVICE_GET_CLASS(dev);
+ VFIOPCIDevice *vdev;
+ struct VFIODeviceFind *find = opaque;
+
+ if (find->found) {
+ return;
+ }
+
+ if (!object_dynamic_cast(OBJECT(dev), "vfio-pci")) {
+ if (!dc->reset) {
+ goto found;
+ }
+ return;
+ }
+ vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+ if (!(vdev->features & VFIO_FEATURE_ENABLE_AER) &&
+ !vdev->vbasedev.reset_works) {
+ goto found;
+ }
+
+ return;
+found:
+ find->pdev = pdev;
+ find->found = true;
+}
+
+static void vfio_check_host_bus_reset(VFIOPCIDevice *vdev, Error **errp)
+{
+ PCIBus *bus = vdev->pdev.bus;
+ struct vfio_pci_hot_reset_info *info = NULL;
+ struct vfio_pci_dependent_device *devices;
+ VFIOGroup *group;
+ struct VFIODeviceFind find;
+ int ret, i;
+
+ ret = vfio_get_hot_reset_info(vdev, &info);
+ if (ret) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s,"
+ " device does not support hot reset.",
+ vdev->vbasedev.name);
+ return;
+ }
+
+ /* List all affected devices by bus reset */
+ devices = &info->devices[0];
+
+ /* Verify that we have all the groups required */
+ for (i = 0; i < info->count; i++) {
+ PCIHostDeviceAddress host;
+ VFIOPCIDevice *tmp;
+ VFIODevice *vbasedev_iter;
+ bool found = false;
+
+ host.domain = devices[i].segment;
+ host.bus = devices[i].bus;
+ host.slot = PCI_SLOT(devices[i].devfn);
+ host.function = PCI_FUNC(devices[i].devfn);
+
+ /* Skip the current device */
+ if (vfio_pci_host_match(&host, &vdev->host)) {
+ continue;
+ }
+
+ /* Ensure we own the group of the affected device */
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ if (group->groupid == devices[i].group_id) {
+ break;
+ }
+ }
+
+ if (!group) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s, "
+ "depends on group %d which is not owned.",
+ vdev->vbasedev.name, devices[i].group_id);
+ goto out;
+ }
+
+ /* Ensure affected devices for reset on the same slot */
+ QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
+ if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
+ continue;
+ }
+ tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
+ if (vfio_pci_host_match(&host, &tmp->host)) {
+ /*
+ * AER errors may be broadcast to all functions of a multi-
+ * function endpoint. If any of those sibling functions are
+ * also assigned, they need to have AER enabled or else an
+ * error may continue to cause a vm_stop condition. IOW,
+ * AER setup of this function would be pointless.
+ */
+ if (vfio_pci_host_slot_match(&vdev->host, &tmp->host) &&
+ !(tmp->features & VFIO_FEATURE_ENABLE_AER)) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s, on same slot"
+ " the dependent device %s which does not enable AER.",
+ vdev->vbasedev.name, tmp->vbasedev.name);
+ goto out;
+ }
+
+ if (tmp->pdev.bus != bus) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s, "
+ "the dependent device %s is not on the same bus",
+ vdev->vbasedev.name, tmp->vbasedev.name);
+ goto out;
+ }
+ found = true;
+ break;
+ }
+ }
+
+ /* Ensure all affected devices assigned to VM */
+ if (!found) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s, "
+ "the dependent device %04x:%02x:%02x.%x "
+ "is not assigned to VM.",
+ vdev->vbasedev.name, host.domain, host.bus,
+ host.slot, host.function);
+ goto out;
+ }
+ }
+
+ /*
+ * Check the all pci devices on or below the target bus
+ * have a reset mechanism at least.
+ */
+ find.pdev = NULL;
+ find.found = false;
+ pci_for_each_device(bus, pci_bus_num(bus),
+ vfio_check_device_noreset, &find);
+ if (find.found) {
+ error_setg(errp, "vfio: Cannot enable AER for device %s, "
+ "the affected device %s does not have a reset mechanism.",
+ vdev->vbasedev.name, find.pdev->name);
+ goto out;
+ }
+
+out:
+ g_free(info);
+ return;
+}
+
+static void vfio_check_devices_host_bus_reset(Error **errp)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+ VFIOPCIDevice *vdev;
+ Error *local_err = NULL;
+
+ /* Check All vfio-pci devices if have bus reset capability */
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
+ continue;
+ }
+ vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ if (vdev->features & VFIO_FEATURE_ENABLE_AER) {
+ vfio_check_host_bus_reset(vdev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+ }
+ }
+
+ return;
+}
+
static int vfio_setup_aer(VFIOPCIDevice *vdev, uint8_t cap_ver,
int pos, uint16_t size)
{
@@ -2047,13 +2238,6 @@ static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
vfio_intx_enable(vdev);
}
-static bool vfio_pci_host_match(PCIHostDeviceAddress *host1,
- PCIHostDeviceAddress *host2)
-{
- return (host1->domain == host2->domain && host1->bus == host2->bus &&
- host1->slot == host2->slot && host1->function == host2->function);
-}
-
static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
{
VFIOGroup *group;
@@ -2559,6 +2743,21 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev)
vdev->req_enabled = false;
}
+static void vfio_pci_machine_done_notify(Notifier *notifier, void *unused)
+{
+ Error *local_err = NULL;
+
+ vfio_check_devices_host_bus_reset(&local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ exit(1);
+ }
+}
+
+static Notifier machine_notifier = {
+ .notify = vfio_pci_machine_done_notify,
+};
+
static int vfio_initfn(PCIDevice *pdev)
{
VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
@@ -2905,6 +3104,11 @@ static const TypeInfo vfio_pci_dev_info = {
static void register_vfio_pci_dev_type(void)
{
type_register_static(&vfio_pci_dev_info);
+ /*
+ * Register notifier when machine init is done, since we need
+ * check the configration manner after all vfio device are inited.
+ */
+ qemu_add_machine_init_done_notifier(&machine_notifier);
}
type_init(register_vfio_pci_dev_type)
@@ -15,6 +15,7 @@
#include "qemu-common.h"
#include "exec/memory.h"
#include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
#include "hw/pci/pci_bridge.h"
#include "hw/vfio/vfio-common.h"
#include "qemu/event_notifier.h"