Register a vfio iommufd container and device for CPR, replacing the generic
CPR register call with a more specific iommufd register call. Add a
blocker if the kernel does not support IOMMU_IOAS_CHANGE_PROCESS.
This is mostly boiler plate. The fields to to saved and restored are added
in subsequent patches.
Signed-off-by: Steve Sistare <steven.sist...@oracle.com>
---
hw/vfio/cpr-iommufd.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/iommufd.c | 6 ++-
hw/vfio/meson.build | 1 +
hw/vfio/vfio-iommufd.h | 1 +
include/hw/vfio/vfio-cpr.h | 8 ++++
5 files changed, 111 insertions(+), 2 deletions(-)
create mode 100644 hw/vfio/cpr-iommufd.c
diff --git a/hw/vfio/cpr-iommufd.c b/hw/vfio/cpr-iommufd.c
new file mode 100644
index 0000000..46f2006
--- /dev/null
+++ b/hw/vfio/cpr-iommufd.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2024-2025 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/vfio/vfio-cpr.h"
+#include "migration/blocker.h"
+#include "migration/cpr.h"
+#include "migration/migration.h"
+#include "migration/vmstate.h"
+#include "system/iommufd.h"
+#include "vfio-iommufd.h"
+
+static bool vfio_cpr_supported(VFIOIOMMUFDContainer *container, Error **errp)
+{
+ if (!iommufd_change_process_capable(container->be)) {
+ error_setg(errp,
+ "VFIO container does not support
IOMMU_IOAS_CHANGE_PROCESS");
+ return false;
+ }
+ return true;
+}
+
+static const VMStateDescription vfio_container_vmstate = {
+ .name = "vfio-iommufd-container",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .needed = cpr_needed_for_reuse,
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static const VMStateDescription iommufd_cpr_vmstate = {
+ .name = "iommufd",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .needed = cpr_needed_for_reuse,
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+bool vfio_iommufd_cpr_register_container(VFIOIOMMUFDContainer *container,
+ Error **errp)
+{
+ VFIOContainerBase *bcontainer = &container->bcontainer;
+ Error **cpr_blocker = &container->cpr_blocker;
+
+ migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier,
+ vfio_cpr_reboot_notifier,
+ MIG_MODE_CPR_REBOOT);
+
+ if (!vfio_cpr_supported(container, cpr_blocker)) {
+ return migrate_add_blocker_modes(cpr_blocker, errp,
+ MIG_MODE_CPR_TRANSFER, -1) == 0;
+ }
+
+ vmstate_register(NULL, -1, &vfio_container_vmstate, container);
+ vmstate_register(NULL, -1, &iommufd_cpr_vmstate, container->be);
+
+ return true;
+}
+
+void vfio_iommufd_cpr_unregister_container(VFIOIOMMUFDContainer *container)
+{
+ VFIOContainerBase *bcontainer = &container->bcontainer;
+
+ vmstate_unregister(NULL, &iommufd_cpr_vmstate, container->be);
+ vmstate_unregister(NULL, &vfio_container_vmstate, container);
+ migrate_del_blocker(&container->cpr_blocker);
+ migration_remove_notifier(&bcontainer->cpr_reboot_notifier);
+}
+
+static const VMStateDescription vfio_device_vmstate = {
+ .name = "vfio-iommufd-device",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .needed = cpr_needed_for_reuse,
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+void vfio_iommufd_cpr_register_device(VFIODevice *vbasedev)
+{
+ vmstate_register(NULL, -1, &vfio_device_vmstate, vbasedev);
+}
+
+void vfio_iommufd_cpr_unregister_device(VFIODevice *vbasedev)
+{
+ vmstate_unregister(NULL, &vfio_device_vmstate, vbasedev);
+}
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index ea99b8d..dabb948 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -460,7 +460,7 @@ static void
iommufd_cdev_container_destroy(VFIOIOMMUFDContainer *container)
if (!QLIST_EMPTY(&bcontainer->device_list)) {
return;
}
- vfio_cpr_unregister_container(bcontainer);
+ vfio_iommufd_cpr_unregister_container(container);
vfio_listener_unregister(bcontainer);
iommufd_backend_free_id(container->be, container->ioas_id);
object_unref(container);
@@ -611,7 +611,7 @@ static bool iommufd_cdev_attach(const char *name,
VFIODevice *vbasedev,
goto err_listener_register;
}
- if (!vfio_cpr_register_container(bcontainer, errp)) {
+ if (!vfio_iommufd_cpr_register_container(container, errp)) {
goto err_listener_register;
}
@@ -633,6 +633,7 @@ found_container:
}
vfio_device_prepare(vbasedev, bcontainer, &dev_info);
+ vfio_iommufd_cpr_register_device(vbasedev);
trace_iommufd_cdev_device_info(vbasedev->name, devfd, vbasedev->num_irqs,
vbasedev->num_regions, vbasedev->flags);
@@ -671,6 +672,7 @@ static void iommufd_cdev_detach(VFIODevice *vbasedev)
vfio_address_space_put(space);
migrate_del_blocker(&vbasedev->cpr.id_blocker);
+ vfio_iommufd_cpr_unregister_device(vbasedev);
iommufd_cdev_unbind_and_disconnect(vbasedev);
close(vbasedev->fd);
}
diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build
index 73d29f9..a158fd8 100644
--- a/hw/vfio/meson.build
+++ b/hw/vfio/meson.build
@@ -21,6 +21,7 @@ system_ss.add(when: 'CONFIG_VFIO_XGMAC', if_true:
files('calxeda-xgmac.c'))
system_ss.add(when: 'CONFIG_VFIO_AMD_XGBE', if_true: files('amd-xgbe.c'))
system_ss.add(when: 'CONFIG_VFIO', if_true: files(
'cpr.c',
+ 'cpr-iommufd.c',
'cpr-legacy.c',
'device.c',
'migration.c',
diff --git a/hw/vfio/vfio-iommufd.h b/hw/vfio/vfio-iommufd.h
index 5615dcd..cc57a05 100644
--- a/hw/vfio/vfio-iommufd.h
+++ b/hw/vfio/vfio-iommufd.h
@@ -25,6 +25,7 @@ typedef struct IOMMUFDBackend IOMMUFDBackend;
typedef struct VFIOIOMMUFDContainer {
VFIOContainerBase bcontainer;
IOMMUFDBackend *be;
+ Error *cpr_blocker;
uint32_t ioas_id;
QLIST_HEAD(, VFIOIOASHwpt) hwpt_list;
} VFIOIOMMUFDContainer;
diff --git a/include/hw/vfio/vfio-cpr.h b/include/hw/vfio/vfio-cpr.h
index d06d117..1379b20 100644
--- a/include/hw/vfio/vfio-cpr.h
+++ b/include/hw/vfio/vfio-cpr.h
@@ -31,6 +31,7 @@ struct VFIOContainerBase;
struct VFIOGroup;
struct VFIOPCIDevice;
struct VFIODevice;
+struct VFIOIOMMUFDContainer;
bool vfio_legacy_cpr_register_container(struct VFIOContainer *container,
Error **errp);
@@ -43,6 +44,13 @@ bool vfio_cpr_register_container(struct VFIOContainerBase
*bcontainer,
Error **errp);
void vfio_cpr_unregister_container(struct VFIOContainerBase *bcontainer);
+bool vfio_iommufd_cpr_register_container(struct VFIOIOMMUFDContainer
*container,
+ Error **errp);
+void vfio_iommufd_cpr_unregister_container(
+ struct VFIOIOMMUFDContainer *container);
+void vfio_iommufd_cpr_register_device(struct VFIODevice *vbasedev);
+void vfio_iommufd_cpr_unregister_device(struct VFIODevice *vbasedev);
+
bool vfio_cpr_container_match(struct VFIOContainer *container,
struct VFIOGroup *group, int *fd);
--
1.8.3.1
