Let's move more code into vmstate_save(), reducing code duplication and
preparing for reuse of vmstate_save() in qemu_savevm_state_setup(). We
have to move vmstate_save() to make the compiler happy.
We'll now also trace from qemu_save_device_state().
Signed-off-by: David Hildenbrand <david@redhat.com>
---
migration/savevm.c | 79 ++++++++++++++++++++++------------------------
1 file changed, 37 insertions(+), 42 deletions(-)
diff --git a/migration/savevm.c b/migration/savevm.c
index a0cdb714f7..d8830297e4 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -897,17 +897,6 @@ static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
}
}
-static int vmstate_save(QEMUFile *f, SaveStateEntry *se,
- JSONWriter *vmdesc)
-{
- trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
- if (!se->vmsd) {
- vmstate_save_old_style(f, se, vmdesc);
- return 0;
- }
- return vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
-}
-
/*
* Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL)
*/
@@ -941,6 +930,43 @@ static void save_section_footer(QEMUFile *f, SaveStateEntry *se)
}
}
+static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
+{
+ int ret;
+
+ if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
+ return 0;
+ }
+ if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
+ trace_savevm_section_skip(se->idstr, se->section_id);
+ return 0;
+ }
+
+ trace_savevm_section_start(se->idstr, se->section_id);
+ save_section_header(f, se, QEMU_VM_SECTION_FULL);
+ if (vmdesc) {
+ json_writer_start_object(vmdesc, NULL);
+ json_writer_str(vmdesc, "name", se->idstr);
+ json_writer_int64(vmdesc, "instance_id", se->instance_id);
+ }
+
+ trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
+ if (!se->vmsd) {
+ vmstate_save_old_style(f, se, vmdesc);
+ } else {
+ ret = vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
+ if (ret) {
+ return ret;
+ }
+ }
+
+ trace_savevm_section_end(se->idstr, se->section_id, 0);
+ save_section_footer(f, se);
+ if (vmdesc) {
+ json_writer_end_object(vmdesc);
+ }
+ return 0;
+}
/**
* qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the
* command and associated data.
@@ -1374,31 +1400,11 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
json_writer_int64(vmdesc, "page_size", qemu_target_page_size());
json_writer_start_array(vmdesc, "devices");
QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
-
- if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
- continue;
- }
- if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
- trace_savevm_section_skip(se->idstr, se->section_id);
- continue;
- }
-
- trace_savevm_section_start(se->idstr, se->section_id);
-
- json_writer_start_object(vmdesc, NULL);
- json_writer_str(vmdesc, "name", se->idstr);
- json_writer_int64(vmdesc, "instance_id", se->instance_id);
-
- save_section_header(f, se, QEMU_VM_SECTION_FULL);
ret = vmstate_save(f, se, vmdesc);
if (ret) {
qemu_file_set_error(f, ret);
return ret;
}
- trace_savevm_section_end(se->idstr, se->section_id, 0);
- save_section_footer(f, se);
-
- json_writer_end_object(vmdesc);
}
if (inactivate_disks) {
@@ -1594,21 +1600,10 @@ int qemu_save_device_state(QEMUFile *f)
if (se->is_ram) {
continue;
}
- if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
- continue;
- }
- if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
- continue;
- }
-
- save_section_header(f, se, QEMU_VM_SECTION_FULL);
-
ret = vmstate_save(f, se, NULL);
if (ret) {
return ret;
}
-
- save_section_footer(f, se);
}
qemu_put_byte(f, QEMU_VM_EOF);
--
2.39.0* David Hildenbrand (david@redhat.com) wrote:
> Let's move more code into vmstate_save(), reducing code duplication and
> preparing for reuse of vmstate_save() in qemu_savevm_state_setup(). We
> have to move vmstate_save() to make the compiler happy.
>
> We'll now also trace from qemu_save_device_state().
Mostly OK, but..
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
> migration/savevm.c | 79 ++++++++++++++++++++++------------------------
Doesn't this also need to upate trace-events?
Dave
> 1 file changed, 37 insertions(+), 42 deletions(-)
>
> diff --git a/migration/savevm.c b/migration/savevm.c
> index a0cdb714f7..d8830297e4 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -897,17 +897,6 @@ static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
> }
> }
>
> -static int vmstate_save(QEMUFile *f, SaveStateEntry *se,
> - JSONWriter *vmdesc)
> -{
> - trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
> - if (!se->vmsd) {
> - vmstate_save_old_style(f, se, vmdesc);
> - return 0;
> - }
> - return vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
> -}
> -
> /*
> * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL)
> */
> @@ -941,6 +930,43 @@ static void save_section_footer(QEMUFile *f, SaveStateEntry *se)
> }
> }
>
> +static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
> +{
> + int ret;
> +
> + if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
> + return 0;
> + }
> + if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
> + trace_savevm_section_skip(se->idstr, se->section_id);
> + return 0;
> + }
> +
> + trace_savevm_section_start(se->idstr, se->section_id);
> + save_section_header(f, se, QEMU_VM_SECTION_FULL);
> + if (vmdesc) {
> + json_writer_start_object(vmdesc, NULL);
> + json_writer_str(vmdesc, "name", se->idstr);
> + json_writer_int64(vmdesc, "instance_id", se->instance_id);
> + }
> +
> + trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
> + if (!se->vmsd) {
> + vmstate_save_old_style(f, se, vmdesc);
> + } else {
> + ret = vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
> + if (ret) {
> + return ret;
> + }
> + }
> +
> + trace_savevm_section_end(se->idstr, se->section_id, 0);
> + save_section_footer(f, se);
> + if (vmdesc) {
> + json_writer_end_object(vmdesc);
> + }
> + return 0;
> +}
> /**
> * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the
> * command and associated data.
> @@ -1374,31 +1400,11 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
> json_writer_int64(vmdesc, "page_size", qemu_target_page_size());
> json_writer_start_array(vmdesc, "devices");
> QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
> -
> - if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
> - continue;
> - }
> - if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
> - trace_savevm_section_skip(se->idstr, se->section_id);
> - continue;
> - }
> -
> - trace_savevm_section_start(se->idstr, se->section_id);
> -
> - json_writer_start_object(vmdesc, NULL);
> - json_writer_str(vmdesc, "name", se->idstr);
> - json_writer_int64(vmdesc, "instance_id", se->instance_id);
> -
> - save_section_header(f, se, QEMU_VM_SECTION_FULL);
> ret = vmstate_save(f, se, vmdesc);
> if (ret) {
> qemu_file_set_error(f, ret);
> return ret;
> }
> - trace_savevm_section_end(se->idstr, se->section_id, 0);
> - save_section_footer(f, se);
> -
> - json_writer_end_object(vmdesc);
> }
>
> if (inactivate_disks) {
> @@ -1594,21 +1600,10 @@ int qemu_save_device_state(QEMUFile *f)
> if (se->is_ram) {
> continue;
> }
> - if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
> - continue;
> - }
> - if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
> - continue;
> - }
> -
> - save_section_header(f, se, QEMU_VM_SECTION_FULL);
> -
> ret = vmstate_save(f, se, NULL);
> if (ret) {
> return ret;
> }
> -
> - save_section_footer(f, se);
> }
>
> qemu_put_byte(f, QEMU_VM_EOF);
> --
> 2.39.0
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
On 12.01.23 17:58, Dr. David Alan Gilbert wrote: > * David Hildenbrand (david@redhat.com) wrote: >> Let's move more code into vmstate_save(), reducing code duplication and >> preparing for reuse of vmstate_save() in qemu_savevm_state_setup(). We >> have to move vmstate_save() to make the compiler happy. >> >> We'll now also trace from qemu_save_device_state(). > > Mostly OK, but.. > >> Signed-off-by: David Hildenbrand <david@redhat.com> >> --- >> migration/savevm.c | 79 ++++++++++++++++++++++------------------------ > > Doesn't this also need to upate trace-events? The existing trace events from qemu_savevm_state_complete_precopy_non_iterable() are simply moved to vmstate_save(), so qemu_save_device_state() will implicitly use them. So no update should be needed (no new events), or am I missing something? Thanks! -- Thanks, David / dhildenb
* David Hildenbrand (david@redhat.com) wrote: > On 12.01.23 17:58, Dr. David Alan Gilbert wrote: > > * David Hildenbrand (david@redhat.com) wrote: > > > Let's move more code into vmstate_save(), reducing code duplication and > > > preparing for reuse of vmstate_save() in qemu_savevm_state_setup(). We > > > have to move vmstate_save() to make the compiler happy. > > > > > > We'll now also trace from qemu_save_device_state(). > > > > Mostly OK, but.. > > > > > Signed-off-by: David Hildenbrand <david@redhat.com> > > > --- > > > migration/savevm.c | 79 ++++++++++++++++++++++------------------------ > > > > Doesn't this also need to upate trace-events? > > The existing trace events from > qemu_savevm_state_complete_precopy_non_iterable() are simply moved to > vmstate_save(), so qemu_save_device_state() will implicitly use them. > > So no update should be needed (no new events), or am I missing something? Aren't you losing the trace_savevm_state_setup() trace? Dave > Thanks! > > > -- > Thanks, > > David / dhildenb > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
On 12.01.23 19:36, Dr. David Alan Gilbert wrote: > * David Hildenbrand (david@redhat.com) wrote: >> On 12.01.23 17:58, Dr. David Alan Gilbert wrote: >>> * David Hildenbrand (david@redhat.com) wrote: >>>> Let's move more code into vmstate_save(), reducing code duplication and >>>> preparing for reuse of vmstate_save() in qemu_savevm_state_setup(). We >>>> have to move vmstate_save() to make the compiler happy. >>>> >>>> We'll now also trace from qemu_save_device_state(). >>> >>> Mostly OK, but.. >>> >>>> Signed-off-by: David Hildenbrand <david@redhat.com> >>>> --- >>>> migration/savevm.c | 79 ++++++++++++++++++++++------------------------ >>> >>> Doesn't this also need to upate trace-events? >> >> The existing trace events from >> qemu_savevm_state_complete_precopy_non_iterable() are simply moved to >> vmstate_save(), so qemu_save_device_state() will implicitly use them. >> >> So no update should be needed (no new events), or am I missing something? > > Aren't you losing the trace_savevm_state_setup() trace? trace_savevm_state_setup() is called from qemu_savevm_state_setup() before/after this change. Calling it from qemu_save_device_state() would be wrong: they skip the setup phase and don't call any save_setup() -- skipping all "se->is_ram". -- Thanks, David / dhildenb
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