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Szmigiero" Subject: [PULL 2/2] vfio/migration: Add vfio_save_block_precopy_empty_hit trace event Date: Tue, 5 Nov 2024 17:58:41 +0100 Message-ID: <20241105165841.3086136-3-clg@redhat.com> In-Reply-To: <20241105165841.3086136-1-clg@redhat.com> References: <20241105165841.3086136-1-clg@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.34, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1730826222150116600 Content-Type: text/plain; charset="utf-8" From: "Maciej S. Szmigiero" This way it is clearly known when there's no more data to send for that device. Signed-off-by: Maciej S. Szmigiero --- include/hw/vfio/vfio-common.h | 1 + hw/vfio/migration.c | 8 ++++++++ hw/vfio/trace-events | 1 + 3 files changed, 10 insertions(+) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 282eadf4ebf5a27a3f7168868fbc2a20d94252c0..e0ce6ec3a9b3245e36811a3383f= 1d642c5536f3d 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -75,6 +75,7 @@ typedef struct VFIOMigration { bool initial_data_sent; =20 bool event_save_iterate_started; + bool event_precopy_empty_hit; } VFIOMigration; =20 struct VFIOGroup; diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 87ddc210578f4ecbaf30fa5d8816ce182cbcbcb0..01aa11013e42b06696e6af28068= f8048d5bfe29a 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -370,6 +370,10 @@ static ssize_t vfio_save_block(QEMUFile *f, VFIOMigrat= ion *migration) * please refer to the Linux kernel VFIO uAPI. */ if (errno =3D=3D ENOMSG) { + if (!migration->event_precopy_empty_hit) { + trace_vfio_save_block_precopy_empty_hit(migration->vbasede= v->name); + migration->event_precopy_empty_hit =3D true; + } return 0; } =20 @@ -379,6 +383,9 @@ static ssize_t vfio_save_block(QEMUFile *f, VFIOMigrati= on *migration) return 0; } =20 + /* Non-empty read: re-arm the trace event */ + migration->event_precopy_empty_hit =3D false; + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE); qemu_put_be64(f, data_size); qemu_put_buffer(f, migration->data_buffer, data_size); @@ -473,6 +480,7 @@ static int vfio_save_setup(QEMUFile *f, void *opaque, E= rror **errp) } =20 migration->event_save_iterate_started =3D false; + migration->event_precopy_empty_hit =3D false; =20 if (vfio_precopy_supported(vbasedev)) { switch (migration->device_state) { diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 032a51a10592fdab3dd9b2be6506d034275678e7..cab1cf1de0a2955efbcf4390d68= 81fa628eb3f14 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -157,6 +157,7 @@ vfio_migration_set_device_state(const char *name, const= char *state) " (%s) stat vfio_migration_set_state(const char *name, const char *new_state, const ch= ar *recover_state) " (%s) new state %s, recover state %s" vfio_migration_state_notifier(const char *name, int state) " (%s) state %d" vfio_save_block(const char *name, int data_size) " (%s) data_size %d" +vfio_save_block_precopy_empty_hit(const char *name) " (%s)" vfio_save_cleanup(const char *name) " (%s)" vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d" vfio_save_complete_precopy_start(const char *name) " (%s)" --=20 2.47.0