From: Tang Chen <tangc...@cn.fujitsu.com>
This patch adds a new bit to memory hotplug IO port indicating that
ej0 has been evaluated by guest OS. And call pc-dimm unplug cb to do
the real removal.
Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangc...@cn.fujitsu.com>
Signed-off-by: Zhu Guihua <zhugh.f...@cn.fujitsu.com>
---
docs/specs/acpi_mem_hotplug.txt | 11 +++++++++--
hw/acpi/memory_hotplug.c | 24 ++++++++++++++++++++++--
hw/i386/acpi-dsdt-mem-hotplug.dsl | 11 ++++++++++-
include/hw/acpi/pc-hotplug.h | 1 +
trace-events | 1 +
5 files changed, 43 insertions(+), 5 deletions(-)
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt
index 1290994..85cd4b8 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 distinguish device for which
+ no device check event to OSPM was issued.
+ 3-7: reserved and should be ignored by OSPM
[0x15-0x17] reserved
write access:
@@ -35,7 +37,12 @@ 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: if set to 1 clears device remove event, set by OSPM
+ after it has emitted device check event for the
+ selected memory device. if guest fails to eject device, it
+ should send OST event about it and forget about device
+ removal.
+ 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 ffacecf..64c7b33 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -2,6 +2,7 @@
#include "hw/acpi/pc-hotplug.h"
#include "hw/mem/pc-dimm.h"
#include "hw/boards.h"
+#include "hw/qdev-core.h"
#include "trace.h"
#include "qapi-event.h"
@@ -75,6 +76,7 @@ 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:
@@ -90,6 +92,8 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr
addr, uint64_t data,
MemHotplugState *mem_st = opaque;
MemStatus *mdev;
ACPIOSTInfo *info;
+ DeviceState *dev = NULL;
+ HotplugHandler *hotplug_ctrl = NULL;
if (!mem_st->dev_count) {
return;
@@ -121,18 +125,34 @@ 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_removing = false;
+ trace_mhp_acpi_clear_remove_evt(mem_st->selector);
+ /*
+ * QEMU memory hot unplug is an asynchronous procedure. QEMU first
+ * calls pc-dimm unplug request cb to send a SCI to guest. When the
+ * Guest OS finished handling the SCI, it evaluates ACPI EJ0, and
+ * QEMU calls pc-dimm unplug cb to remove memory device.
+ */
+ dev = DEVICE(mdev->dimm);
+ hotplug_ctrl = qdev_get_hotplug_handler(dev);
+ /* Call pc-dimm unplug cb. */
+ hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
}
+
+ break;
+ default:
break;
}
diff --git a/hw/i386/acpi-dsdt-mem-hotplug.dsl
b/hw/i386/acpi-dsdt-mem-hotplug.dsl
index 2a36c47..b53bf77 100644
--- a/hw/i386/acpi-dsdt-mem-hotplug.dsl
+++ b/hw/i386/acpi-dsdt-mem-hotplug.dsl
@@ -50,6 +50,7 @@
Offset(20),
MEMORY_SLOT_ENABLED, 1, // 1 if enabled, read only
MEMORY_SLOT_INSERT_EVENT, 1, // (read) 1 if has a insert
event. (write) 1 to clear event
+ MEMORY_SLOT_REMOVE_EVENT, 1, // (read) 1 if has a remove
event. (write) 1 to clear event
}
Mutex (MEMORY_SLOT_LOCK, 0)
@@ -71,8 +72,9 @@
If (LEqual(MEMORY_SLOT_INSERT_EVENT, One)) { // Memory
device needs check
MEMORY_SLOT_NOTIFY_METHOD(Local0, 1)
Store(1, MEMORY_SLOT_INSERT_EVENT)
+ } Elseif (LEqual(MEMORY_SLOT_REMOVE_EVENT, One)) { //
Ejection request
+ MEMORY_SLOT_NOTIFY_METHOD(Local0, 3)
}
- // TODO: handle memory eject request
Add(Local0, One, Local0) // goto next DIMM
}
Release(MEMORY_SLOT_LOCK)
@@ -172,5 +174,12 @@
Store(Arg2, MEMORY_SLOT_OST_STATUS)
Release(MEMORY_SLOT_LOCK)
}
+
+ Method(MEMORY_SLOT_EJECT_METHOD, 2) {
+ Acquire(MEMORY_SLOT_LOCK, 0xFFFF)
+ Store(ToInteger(Arg0), MEMORY_SLOT_SLECTOR) // select DIMM
+ Store(One, MEMORY_SLOT_REMOVE_EVENT)
+ Release(MEMORY_SLOT_LOCK)
+ }
} // Device()
} // Scope()
diff --git a/include/hw/acpi/pc-hotplug.h b/include/hw/acpi/pc-hotplug.h
index ae30ff1..b61b6ea 100644
--- a/include/hw/acpi/pc-hotplug.h
+++ b/include/hw/acpi/pc-hotplug.h
@@ -42,6 +42,7 @@
#define MEMORY_SLOT_PROXIMITY MPX
#define MEMORY_SLOT_ENABLED MES
#define MEMORY_SLOT_INSERT_EVENT MINS
+#define MEMORY_SLOT_REMOVE_EVENT MRMV
#define MEMORY_SLOT_SLECTOR MSEL
#define MEMORY_SLOT_OST_EVENT MOEV
#define MEMORY_SLOT_OST_STATUS MOSC
diff --git a/trace-events b/trace-events
index f87b077..4439f45 100644
--- a/trace-events
+++ b/trace-events
@@ -1568,6 +1568,7 @@ mhp_acpi_write_slot(uint32_t slot) "set active slot:
0x%"PRIx32
mhp_acpi_write_ost_ev(uint32_t slot, uint32_t ev) "slot[0x%"PRIx32"] OST
EVENT: 0x%"PRIx32
mhp_acpi_write_ost_status(uint32_t slot, uint32_t st) "slot[0x%"PRIx32"] OST
STATUS: 0x%"PRIx32
mhp_acpi_clear_insert_evt(uint32_t slot) "slot[0x%"PRIx32"] clear insert event"
+mhp_acpi_clear_remove_evt(uint32_t slot) "slot[0x%"PRIx32"] clear remove event"
# hw/i386/pc.c
mhp_pc_dimm_assigned_slot(int slot) "0x%d"
--
1.9.3
