[PULL 0/2] vfio queue

[PULL 0/2] vfio queue

[Cédric Le Goater]

The following changes since commit cbccded4a2b5d685a426a437e25f67d3a375b292:

  Merge tag 'pull-riscv-to-apply-20240308-1' of https://github.com/alistair23/qemu into staging (2024-03-08 11:47:01 +0000)

are available in the Git repository at:

  https://github.com/legoater/qemu/ tags/pull-vfio-20240310

for you to fetch changes up to 0cb51c183a91e882b10ead4ddf2321296a537c47:

  vfio: allow cpr-reboot migration if suspended (2024-03-08 22:10:13 +0100)

----------------------------------------------------------------
vfio queue:

* Allow cpr-reboot for vfio

----------------------------------------------------------------
Steve Sistare (2):
      vfio: register container for cpr
      vfio: allow cpr-reboot migration if suspended

 include/hw/vfio/vfio-common.h         |  3 +++
 include/hw/vfio/vfio-container-base.h |  1 +
 hw/vfio/common.c                      |  2 +-
 hw/vfio/container.c                   | 11 +++++++++-
 hw/vfio/cpr.c                         | 39 +++++++++++++++++++++++++++++++++++
 hw/vfio/iommufd.c                     |  6 ++++++
 hw/vfio/migration.c                   |  2 +-
 hw/vfio/meson.build                   |  1 +
 8 files changed, 62 insertions(+), 3 deletions(-)
 create mode 100644 hw/vfio/cpr.c

[PULL 1/2] vfio: register container for cpr

[Cédric Le Goater]

From: Steve Sistare <steven.sistare@oracle.com>

Define entry points to perform per-container cpr-specific initialization
and teardown.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---
 include/hw/vfio/vfio-common.h |  3 +++
 hw/vfio/container.c           | 11 ++++++++++-
 hw/vfio/cpr.c                 | 19 +++++++++++++++++++
 hw/vfio/iommufd.c             |  6 ++++++
 hw/vfio/meson.build           |  1 +
 5 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 hw/vfio/cpr.c

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 4a6c262f778b9bf4bf5760ffd548b9b6ea5bad33..b9da6c08ef41174610eb92726c590309a53696a3 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -205,6 +205,9 @@ void vfio_detach_device(VFIODevice *vbasedev);
 int vfio_kvm_device_add_fd(int fd, Error **errp);
 int vfio_kvm_device_del_fd(int fd, Error **errp);
 
+int vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp);
+void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer);
+
 extern const MemoryRegionOps vfio_region_ops;
 typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
 typedef QLIST_HEAD(VFIODeviceList, VFIODevice) VFIODeviceList;
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index bd25b9fbad2e717e63c2ab0e331186e5f63cef49..096d77eac3946a9c38fc2a98116b93353f71f06e 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -621,10 +621,15 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
         goto free_container_exit;
     }
 
+    ret = vfio_cpr_register_container(bcontainer, errp);
+    if (ret) {
+        goto free_container_exit;
+    }
+
     ret = vfio_ram_block_discard_disable(container, true);
     if (ret) {
         error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
-        goto free_container_exit;
+        goto unregister_container_exit;
     }
 
     assert(bcontainer->ops->setup);
@@ -667,6 +672,9 @@ listener_release_exit:
 enable_discards_exit:
     vfio_ram_block_discard_disable(container, false);
 
+unregister_container_exit:
+    vfio_cpr_unregister_container(bcontainer);
+
 free_container_exit:
     g_free(container);
 
@@ -710,6 +718,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
         vfio_container_destroy(bcontainer);
 
         trace_vfio_disconnect_container(container->fd);
+        vfio_cpr_unregister_container(bcontainer);
         close(container->fd);
         g_free(container);
 
diff --git a/hw/vfio/cpr.c b/hw/vfio/cpr.c
new file mode 100644
index 0000000000000000000000000000000000000000..3bede5494804e4aa291663c1e7c01d5dc5d3a407
--- /dev/null
+++ b/hw/vfio/cpr.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2021-2024 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 "hw/vfio/vfio-common.h"
+#include "qapi/error.h"
+
+int vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp)
+{
+    return 0;
+}
+
+void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer)
+{
+}
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 9bfddc1360895413176a9f170e29e89027384a66..e1be2244947172367e2a1f85c59967c20bfcff77 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -411,6 +411,11 @@ found_container:
         goto err_listener_register;
     }
 
+    ret = vfio_cpr_register_container(bcontainer, errp);
+    if (ret) {
+        goto err_listener_register;
+    }
+
     /*
      * TODO: examine RAM_BLOCK_DISCARD stuff, should we do group level
      * for discarding incompatibility check as well?
@@ -461,6 +466,7 @@ static void iommufd_cdev_detach(VFIODevice *vbasedev)
         iommufd_cdev_ram_block_discard_disable(false);
     }
 
+    vfio_cpr_unregister_container(bcontainer);
     iommufd_cdev_detach_container(vbasedev, container);
     iommufd_cdev_container_destroy(container);
     vfio_put_address_space(space);
diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build
index bb98493b53e858c53181e224f9cb46892838a8be..bba776f75cc718956b37f68cb542b378a509d77f 100644
--- a/hw/vfio/meson.build
+++ b/hw/vfio/meson.build
@@ -5,6 +5,7 @@ vfio_ss.add(files(
   'container-base.c',
   'container.c',
   'migration.c',
+  'cpr.c',
 ))
 vfio_ss.add(when: 'CONFIG_PSERIES', if_true: files('spapr.c'))
 vfio_ss.add(when: 'CONFIG_IOMMUFD', if_true: files(
-- 
2.44.0

[PULL 2/2] vfio: allow cpr-reboot migration if suspended

[Cédric Le Goater]

From: Steve Sistare <steven.sistare@oracle.com>

Allow cpr-reboot for vfio if the guest is in the suspended runstate.  The
guest drivers' suspend methods flush outstanding requests and re-initialize
the devices, and thus there is no device state to save and restore.  The
user is responsible for suspending the guest before initiating cpr, such as
by issuing guest-suspend-ram to the qemu guest agent.

Relax the vfio blocker so it does not apply to cpr, and add a notifier that
verifies the guest is suspended.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---
 include/hw/vfio/vfio-container-base.h |  1 +
 hw/vfio/common.c                      |  2 +-
 hw/vfio/cpr.c                         | 20 ++++++++++++++++++++
 hw/vfio/migration.c                   |  2 +-
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index b2813b0c117985425c842d91f011bb895955d738..3582d5f97a37877b2adfc0d0b06996c82403f8b7 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -49,6 +49,7 @@ typedef struct VFIOContainerBase {
     QLIST_ENTRY(VFIOContainerBase) next;
     QLIST_HEAD(, VFIODevice) device_list;
     GList *iova_ranges;
+    NotifierWithReturn cpr_reboot_notifier;
 } VFIOContainerBase;
 
 typedef struct VFIOGuestIOMMU {
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 059bfdc07a85e2eb908df828c1f42104d683e911..ff88c3f31ca660b3c0a790601100fdc6116192a0 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -128,7 +128,7 @@ int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
     error_setg(&multiple_devices_migration_blocker,
                "Multiple VFIO devices migration is supported only if all of "
                "them support P2P migration");
-    ret = migrate_add_blocker(&multiple_devices_migration_blocker, errp);
+    ret = migrate_add_blocker_normal(&multiple_devices_migration_blocker, errp);
 
     return ret;
 }
diff --git a/hw/vfio/cpr.c b/hw/vfio/cpr.c
index 3bede5494804e4aa291663c1e7c01d5dc5d3a407..392c2dd95d14664bade0ae74655e91bc839504c0 100644
--- a/hw/vfio/cpr.c
+++ b/hw/vfio/cpr.c
@@ -7,13 +7,33 @@
 
 #include "qemu/osdep.h"
 #include "hw/vfio/vfio-common.h"
+#include "migration/misc.h"
 #include "qapi/error.h"
+#include "sysemu/runstate.h"
+
+static int vfio_cpr_reboot_notifier(NotifierWithReturn *notifier,
+                                    MigrationEvent *e, Error **errp)
+{
+    if (e->type == MIG_EVENT_PRECOPY_SETUP &&
+        !runstate_check(RUN_STATE_SUSPENDED) && !vm_get_suspended()) {
+
+        error_setg(errp,
+            "VFIO device only supports cpr-reboot for runstate suspended");
+
+        return -1;
+    }
+    return 0;
+}
 
 int vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp)
 {
+    migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier,
+                                vfio_cpr_reboot_notifier,
+                                MIG_MODE_CPR_REBOOT);
     return 0;
 }
 
 void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer)
 {
+    migration_remove_notifier(&bcontainer->cpr_reboot_notifier);
 }
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 50140eda872b3d5c9438459e207682de9be06511..2050ac8897231ff89cc223f0570d5c7a65dede9e 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -889,7 +889,7 @@ static int vfio_block_migration(VFIODevice *vbasedev, Error *err, Error **errp)
     vbasedev->migration_blocker = error_copy(err);
     error_free(err);
 
-    return migrate_add_blocker(&vbasedev->migration_blocker, errp);
+    return migrate_add_blocker_normal(&vbasedev->migration_blocker, errp);
 }
 
 /* ---------------------------------------------------------------------- */
-- 
2.44.0

Re: [PULL 0/2] vfio queue

[Peter Maydell]

On Sun, 10 Mar 2024 at 19:20, Cédric Le Goater <clg@redhat.com> wrote:
>
> The following changes since commit cbccded4a2b5d685a426a437e25f67d3a375b292:
>
>   Merge tag 'pull-riscv-to-apply-20240308-1' of https://github.com/alistair23/qemu into staging (2024-03-08 11:47:01 +0000)
>
> are available in the Git repository at:
>
>   https://github.com/legoater/qemu/ tags/pull-vfio-20240310
>
> for you to fetch changes up to 0cb51c183a91e882b10ead4ddf2321296a537c47:
>
>   vfio: allow cpr-reboot migration if suspended (2024-03-08 22:10:13 +0100)
>
> ----------------------------------------------------------------
> vfio queue:
>
> * Allow cpr-reboot for vfio
>
> ----------------------------------------------------------------


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/9.0
for any user-visible changes.

-- PMM