On 5/13/24 15:30, Avihai Horon wrote:
On 06/05/2024 12:20, Cédric Le Goater wrote:External email: Use caution opening links or attachments Use vmstate_save_state_with_err() to improve error reporting in the callers and store a reported error under the migration stream. Add documentation while at it. Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org> Signed-off-by: Cédric Le Goater <c...@redhat.com> --- include/hw/vfio/vfio-common.h | 25 ++++++++++++++++++++++++- hw/vfio/migration.c | 18 ++++++++++++------ hw/vfio/pci.c | 5 +++-- 3 files changed, 39 insertions(+), 9 deletions(-) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index b9da6c08ef41174610eb92726c590309a53696a3..46f88493634b5634a9c14a5caa33a463fbf2c50d 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -133,7 +133,30 @@ struct VFIODeviceOps { int (*vfio_hot_reset_multi)(VFIODevice *vdev); void (*vfio_eoi)(VFIODevice *vdev); Object *(*vfio_get_object)(VFIODevice *vdev); - void (*vfio_save_config)(VFIODevice *vdev, QEMUFile *f); + + /** + * @vfio_save_config + * + * Save device config state + * + * @vdev: #VFIODevice for which to save the config + * @f: #QEMUFile where to send the data + * @errp: pointer to Error*, to store an error if it happens. + * + * Returns zero to indicate success and negative for error + */ + int (*vfio_save_config)(VFIODevice *vdev, QEMUFile *f, Error **errp); + + /** + * @vfio_load_config + * + * Load device config state + * + * @vdev: #VFIODevice for which to load the config + * @f: #QEMUFile where to get the data + * + * Returns zero to indicate success and negative for error + */ int (*vfio_load_config)(VFIODevice *vdev, QEMUFile *f); }; diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 9b6375c949f7a8dca857ead2506855f63fa051e4..87437490bd50321b3eb27770c932078597053746 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -189,14 +189,19 @@ static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev, return ret; } -static int vfio_save_device_config_state(QEMUFile *f, void *opaque) +static int vfio_save_device_config_state(QEMUFile *f, void *opaque, + Error **errp) { VFIODevice *vbasedev = opaque; + int ret; qemu_put_be64(f, VFIO_MIG_FLAG_DEV_CONFIG_STATE); if (vbasedev->ops && vbasedev->ops->vfio_save_config) { - vbasedev->ops->vfio_save_config(vbasedev, f); + ret = vbasedev->ops->vfio_save_config(vbasedev, f, errp); + if (ret) { + return ret; + } } qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);Below we have: return qemu_file_get_error(f); Need to set errp in case of error.
yep. I will change the returned type to bool while at it.
@@ -588,13 +593,14 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) static void vfio_save_state(QEMUFile *f, void *opaque) { VFIODevice *vbasedev = opaque; + Error *local_err = NULL; int ret; - ret = vfio_save_device_config_state(f, opaque); + ret = vfio_save_device_config_state(f, opaque, &local_err); if (ret) { - error_report("%s: Failed to save device config space", - vbasedev->name); - qemu_file_set_error(f, ret); + error_prepend(&local_err, "%s: Failed to save device config space",Add " - " ("... device config space - "), like in the other patches?
ok. I will check how (in)consistent I was when doing these error_prepend changes. Thanks, C.
Thanks.+ vbasedev->name); + qemu_file_set_error_obj(f, ret, local_err); } } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 64780d1b793345c8e8996fe6b7987059ce831c11..fc6e54e871508bb0e2a3ac9079a195c086531f21 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2586,11 +2586,12 @@ static const VMStateDescription vmstate_vfio_pci_config = { } }; -static void vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f) +static int vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f, Error **errp) { VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); - vmstate_save_state(f, &vmstate_vfio_pci_config, vdev, NULL); + return vmstate_save_state_with_err(f, &vmstate_vfio_pci_config, vdev, NULL, + errp); } static int vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f) -- 2.45.0
