From 2f168d0708581c33baf6c78d75a89e8cd705f9f6 Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Mon, 25 Sep 2017 12:29:17 +0100 Subject: [PATCH] migration: Route more error paths vmstate_save_state is called in lots of places. Route error returns from the easier cases back up; there are lots of more complex cases where their own error paths need fixing. Signed-off-by: Dr. David Alan Gilbert Message-Id: <20170925112917.21340-7-dgilbert@redhat.com> Reviewed-by: Peter Xu Reviewed-by: Cornelia Huck Reviewed-by: Juan Quintela Signed-off-by: Dr. David Alan Gilbert Commit message fix up as Peter's review --- hw/display/virtio-gpu.c | 4 +--- hw/virtio/virtio.c | 13 +++++++------ include/hw/virtio/virtio.h | 2 +- migration/vmstate-types.c | 11 ++++++++--- tests/test-vmstate.c | 9 ++++++--- 5 files changed, 23 insertions(+), 16 deletions(-) diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index 6b5f119d96..43bbe09ea0 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -1050,9 +1050,7 @@ static int virtio_gpu_save(QEMUFile *f, void *opaque, size_t size, } qemu_put_be32(f, 0); /* end of list */ - vmstate_save_state(f, &vmstate_virtio_gpu_scanouts, g, NULL); - - return 0; + return vmstate_save_state(f, &vmstate_virtio_gpu_scanouts, g, NULL); } static int virtio_gpu_load(QEMUFile *f, void *opaque, size_t size, diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 3129d25c00..311929e9df 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -1897,7 +1897,7 @@ static const VMStateDescription vmstate_virtio = { } }; -void virtio_save(VirtIODevice *vdev, QEMUFile *f) +int virtio_save(VirtIODevice *vdev, QEMUFile *f) { BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); @@ -1947,20 +1947,21 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f) } if (vdc->vmsd) { - vmstate_save_state(f, vdc->vmsd, vdev, NULL); + int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL); + if (ret) { + return ret; + } } /* Subsections */ - vmstate_save_state(f, &vmstate_virtio, vdev, NULL); + return vmstate_save_state(f, &vmstate_virtio, vdev, NULL); } /* A wrapper for use as a VMState .put function */ static int virtio_device_put(QEMUFile *f, void *opaque, size_t size, VMStateField *field, QJSON *vmdesc) { - virtio_save(VIRTIO_DEVICE(opaque), f); - - return 0; + return virtio_save(VIRTIO_DEVICE(opaque), f); } /* A wrapper for use as a VMState .get function */ diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 80c45c321e..5abada6966 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -188,7 +188,7 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq); void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); -void virtio_save(VirtIODevice *vdev, QEMUFile *f); +int virtio_save(VirtIODevice *vdev, QEMUFile *f); extern const VMStateInfo virtio_vmstate_info; diff --git a/migration/vmstate-types.c b/migration/vmstate-types.c index c056c98bdb..48184c380d 100644 --- a/migration/vmstate-types.c +++ b/migration/vmstate-types.c @@ -550,13 +550,14 @@ static int put_tmp(QEMUFile *f, void *pv, size_t size, VMStateField *field, { const VMStateDescription *vmsd = field->vmsd; void *tmp = g_malloc(size); + int ret; /* Writes the parent field which is at the start of the tmp */ *(void **)tmp = pv; - vmstate_save_state(f, vmsd, tmp, vmdesc); + ret = vmstate_save_state(f, vmsd, tmp, vmdesc); g_free(tmp); - return 0; + return ret; } const VMStateInfo vmstate_info_tmp = { @@ -657,12 +658,16 @@ static int put_qtailq(QEMUFile *f, void *pv, size_t unused_size, /* offset of the QTAILQ entry in a QTAILQ element*/ size_t entry_offset = field->start; void *elm; + int ret; trace_put_qtailq(vmsd->name, vmsd->version_id); QTAILQ_RAW_FOREACH(elm, pv, entry_offset) { qemu_put_byte(f, true); - vmstate_save_state(f, vmsd, elm, vmdesc); + ret = vmstate_save_state(f, vmsd, elm, vmdesc); + if (ret) { + return ret; + } } qemu_put_byte(f, false); diff --git a/tests/test-vmstate.c b/tests/test-vmstate.c index e643ac662b..087844b6c8 100644 --- a/tests/test-vmstate.c +++ b/tests/test-vmstate.c @@ -70,7 +70,8 @@ static void save_vmstate(const VMStateDescription *desc, void *obj) QEMUFile *f = open_test_file(true); /* Save file with vmstate */ - vmstate_save_state(f, desc, obj, NULL); + int ret = vmstate_save_state(f, desc, obj, NULL); + g_assert(!ret); qemu_put_byte(f, QEMU_VM_EOF); g_assert(!qemu_file_get_error(f)); qemu_fclose(f); @@ -381,7 +382,8 @@ static void test_save_noskip(void) QEMUFile *fsave = open_test_file(true); TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6, .skip_c_e = false }; - vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL); + int ret = vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL); + g_assert(!ret); g_assert(!qemu_file_get_error(fsave)); uint8_t expected[] = { @@ -402,7 +404,8 @@ static void test_save_skip(void) QEMUFile *fsave = open_test_file(true); TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6, .skip_c_e = true }; - vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL); + int ret = vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL); + g_assert(!ret); g_assert(!qemu_file_get_error(fsave)); uint8_t expected[] = {