From edcf24a08d66d620a10c746824e31d230c8516ce Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Wed, 12 Jul 2023 17:46:57 +0200 Subject: [PATCH 13/37] vfio/migration: Refactor vfio_save_block() to return saved data size MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Cédric Le Goater RH-MergeRequest: 179: vfio: live migration support RH-Bugzilla: 2192818 RH-Acked-by: Eric Auger RH-Acked-by: Miroslav Rezanina RH-Commit: [11/28] b4aed6ddcbde159e98275a0675dcdf45d644673b (clegoate/qemu-kvm-c9s) Bugzilla: https://bugzilla.redhat.com/2192818 commit cf53efbbda2e Author: Avihai Horon Date: Wed Jun 21 14:11:58 2023 +0300 vfio/migration: Refactor vfio_save_block() to return saved data size Refactor vfio_save_block() to return the size of saved data on success and -errno on error. This will be used in next patch to implement VFIO migration pre-copy support. Signed-off-by: Avihai Horon Reviewed-by: Cédric Le Goater Reviewed-by: Juan Quintela Tested-by: YangHang Liu Acked-by: Alex Williamson Signed-off-by: Cédric Le Goater Signed-off-by: Cédric Le Goater --- hw/vfio/migration.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 6b58dddb88..235978fd68 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -241,8 +241,8 @@ static int vfio_query_stop_copy_size(VFIODevice *vbasedev, return 0; } -/* Returns 1 if end-of-stream is reached, 0 if more data and -errno if error */ -static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) +/* Returns the size of saved data on success and -errno on error */ +static ssize_t vfio_save_block(QEMUFile *f, VFIOMigration *migration) { ssize_t data_size; @@ -252,7 +252,7 @@ static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) return -errno; } if (data_size == 0) { - return 1; + return 0; } qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE); @@ -262,7 +262,7 @@ static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) trace_vfio_save_block(migration->vbasedev->name, data_size); - return qemu_file_get_error(f); + return qemu_file_get_error(f) ?: data_size; } /* ---------------------------------------------------------------------- */ @@ -335,6 +335,7 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy, static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) { VFIODevice *vbasedev = opaque; + ssize_t data_size; int ret; /* We reach here with device state STOP only */ @@ -345,11 +346,11 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) } do { - ret = vfio_save_block(f, vbasedev->migration); - if (ret < 0) { - return ret; + data_size = vfio_save_block(f, vbasedev->migration); + if (data_size < 0) { + return data_size; } - } while (!ret); + } while (data_size); qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); ret = qemu_file_get_error(f); -- 2.39.3