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nvdimm acpi: introduce fit buffer

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The buffer is used to save the FIT info for all the presented nvdimm
devices which is updated after the nvdimm device is plugged or
unplugged. In the later patch, it will be used to construct NVDIMM
ACPI _FIT method which reflects the presented nvdimm devices after
nvdimm hotplug

As FIT buffer can not completely mapped into guest address space,
OSPM will exit to QEMU multiple times, however, there is the race
condition - FIT may be changed during these multiple exits, so that
some rules are introduced:
1) the user should hold the @lock to access the buffer and
2) mark @dirty whenever the buffer is updated.

@dirty is cleared for the first time OSPM gets fit buffer, if
dirty is detected in the later access, OSPM will restart the
access

As fit should be updated after nvdimm device is successfully realized
so that a new hotplug callback, post_hotplug, is introduced

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xiao Guangrong 2016-10-29 00:35:38 +08:00 • committed by Michael S. Tsirkin
parent bdfd065b1f
commit 75b0713e18
7 changed files with 125 additions and 24 deletions
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22
hw/core/qdev.c
View file

@ -945,10 +945,21 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
goto child_realize_fail;
}
}
if (dev->hotplugged) {
device_reset(dev);
}
dev->pending_deleted_event = false;
dev->realized = value;
if (hotplug_ctrl) {
hotplug_handler_post_plug(hotplug_ctrl, dev, &local_err);
}
if (local_err != NULL) {
dev->realized = value;
goto post_realize_fail;
}
} else if (!value && dev->realized) {
Error **local_errp = NULL;
QLIST_FOREACH(bus, &dev->child_bus, sibling) {
@ -965,13 +976,14 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
}
dev->pending_deleted_event = true;
DEVICE_LISTENER_CALL(unrealize, Reverse, dev);
if (local_err != NULL) {
goto fail;
}
dev->realized = value;
}
if (local_err != NULL) {
goto fail;
}
dev->realized = value;
return;
child_realize_fail: