This patch adds a new bit to memory hotplug IO port indicating that
memory device is be removed. And set MemStatus->is_removing to false
when the bit is written.
NOTE: MemStatus->is_removing is set to true in acpi_memory_unplug_cb()
when doing memory hot-remove with device_del command.
Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangc...@cn.fujitsu.com>
---
docs/specs/acpi_mem_hotplug.txt | 8 ++++++--
hw/acpi/memory_hotplug.c | 14 +++++++++++---
2 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt
index 1290994..5524c30 100644
--- a/docs/specs/acpi_mem_hotplug.txt
+++ b/docs/specs/acpi_mem_hotplug.txt
@@ -19,7 +19,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte
access):
1: Device insert event, used to distinguish device for which
no device check event to OSPM was issued.
It's valid only when bit 1 is set.
- 2-7: reserved and should be ignored by OSPM
+ 2: Device remove event, used to indicate that device is being
+ removed.
+ 3-7: reserved and should be ignored by OSPM
[0x15-0x17] reserved
write access:
@@ -35,7 +37,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte
access):
1: if set to 1 clears device insert event, set by OSPM
after it has emitted device check event for the
selected memory device
- 2-7: reserved, OSPM must clear them before writing to register
+ 2: set by hardware after it has emitted devive eject event for
+ selected memory device
+ 3-7: reserved, OSPM must clear them before writing to register
Selecting memory device slot beyond present range has no effect on platform:
- write accesses to memory hot-plug registers not documented above are
diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index 01dea6c..a745bb0 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -75,6 +75,7 @@ static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr
addr,
case 0x14: /* pack and return is_* fields */
val |= mdev->is_enabled ? 1 : 0;
val |= mdev->is_inserting ? 2 : 0;
+ val |= mdev->is_removing ? 4 : 0;
trace_mhp_acpi_read_flags(mem_st->selector, val);
break;
default:
@@ -121,21 +122,28 @@ static void acpi_memory_hotplug_write(void *opaque,
hwaddr addr, uint64_t data,
mdev = &mem_st->devs[mem_st->selector];
mdev->ost_status = data;
trace_mhp_acpi_write_ost_status(mem_st->selector, mdev->ost_status);
- /* TODO: implement memory removal on guest signal */
info = acpi_memory_device_status(mem_st->selector, mdev);
qapi_event_send_acpi_device_ost(info, &error_abort);
qapi_free_ACPIOSTInfo(info);
break;
- case 0x14:
+ case 0x14: /* set is_* fields */
mdev = &mem_st->devs[mem_st->selector];
+
if (data & 2) { /* clear insert event */
mdev->is_inserting = false;
trace_mhp_acpi_clear_insert_evt(mem_st->selector);
+ } else if (data & 4) { /* request removal of device */
+ mdev->is_enabled = false;
+ mdev->is_removing = false;
+ object_unparent(OBJECT(mdev->dimm));
+ mdev->dimm = NULL;
}
+
+ break;
+ default:
break;
}
-
}
static const MemoryRegionOps acpi_memory_hotplug_ops = {
.read = acpi_memory_hotplug_read,
--
1.8.4.2
