diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index 15d8f57..79158f1 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -2,6 +2,7 @@
 #include "hw/acpi/acpi_defs.h"
 #include "hw/mem/dimm.h"
 #include "hw/boards.h"
+#include "trace.h"
 
 static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
                                          unsigned int size)
@@ -11,6 +12,7 @@ static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
     MemStatus *mdev;
 
     if (mem_st->selector >= mem_st->dev_count) {
+        trace_mhp_acpi_invalid_slot_selected(mem_st->selector);
         return 0;
     }
 
@@ -18,24 +20,30 @@ static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
     switch (addr) {
     case 0x0: /* Lo part of phys address where DIMM is mapped */
         val = object_property_get_int(OBJECT(mdev->dimm), DIMM_ADDR_PROP, NULL);
+        trace_mhp_acpi_read_addr_lo(mem_st->selector, val);
         break;
     case 0x4: /* Hi part of phys address where DIMM is mapped */
         val = object_property_get_int(OBJECT(mdev->dimm), DIMM_ADDR_PROP,
                                       NULL) >> 32;
+        trace_mhp_acpi_read_addr_hi(mem_st->selector, val);
         break;
     case 0x8: /* Lo part of DIMM size */
         val = object_property_get_int(OBJECT(mdev->dimm), DIMM_SIZE_PROP, NULL);
+        trace_mhp_acpi_read_size_lo(mem_st->selector, val);
         break;
     case 0xc: /* Hi part of DIMM size */
         val = object_property_get_int(OBJECT(mdev->dimm), DIMM_SIZE_PROP,
                                       NULL) >> 32;
+        trace_mhp_acpi_read_size_hi(mem_st->selector, val);
         break;
     case 0x10: /* node proximity for _PXM method */
         val = object_property_get_int(OBJECT(mdev->dimm), DIMM_NODE_PROP, NULL);
+        trace_mhp_acpi_read_pxm(mem_st->selector, val);
         break;
     case 0x14: /* pack and return is_* fields */
         val |= mdev->is_enabled   ? 1 : 0;
         val |= mdev->is_inserting ? 2 : 0;
+        trace_mhp_acpi_read_flags(mem_st->selector, val);
         break;
     default:
         val = ~0;
@@ -56,6 +64,7 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
 
     if (addr) {
         if (mem_st->selector >= mem_st->dev_count) {
+            trace_mhp_acpi_invalid_slot_selected(mem_st->selector);
             return;
         }
     }
@@ -63,6 +72,7 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
     switch (addr) {
     case 0x0: /* DIMM slot selector */
         mem_st->selector = data;
+        trace_mhp_acpi_write_slot(mem_st->selector);
         break;
     case 0x4: /* _OST event  */
         mdev = &mem_st->devs[mem_st->selector];
@@ -72,10 +82,12 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
             /* TODO: handle device remove OST event */
         }
         mdev->ost_event = data;
+        trace_mhp_acpi_write_ost_ev(mem_st->selector, mdev->ost_event);
         break;
     case 0x8: /* _OST status */
         mdev = &mem_st->devs[mem_st->selector];
         mdev->ost_status = data;
+        trace_mhp_acpi_write_ost_status(mem_st->selector, mdev->ost_status);
         /* TODO: report async error */
         /* TODO: implement memory removal on guest signal */
         break;
@@ -83,6 +95,7 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
         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);
         }
         break;
     }
diff --git a/trace-events b/trace-events
index b6d289d..4f4c58f 100644
--- a/trace-events
+++ b/trace-events
@@ -1252,3 +1252,16 @@ xen_pv_mmio_write(uint64_t addr) "WARNING: write to Xen PV Device MMIO space (ad
 # hw/pci/pci_host.c
 pci_cfg_read(const char *dev, unsigned devid, unsigned fnid, unsigned offs, unsigned val) "%s %02u:%u @0x%x -> 0x%x"
 pci_cfg_write(const char *dev, unsigned devid, unsigned fnid, unsigned offs, unsigned val) "%s %02u:%u @0x%x <- 0x%x"
+
+#hw/acpi/memory_hotplug.c
+mhp_acpi_invalid_slot_selected(uint32_t slot) "0x%"PRIx32
+mhp_acpi_read_addr_lo(uint32_t slot, uint32_t addr) "slot[0x%"PRIx32"] addr lo: 0x%"PRIx32
+mhp_acpi_read_addr_hi(uint32_t slot, uint32_t addr) "slot[0x%"PRIx32"] addr hi: 0x%"PRIx32
+mhp_acpi_read_size_lo(uint32_t slot, uint32_t size) "slot[0x%"PRIx32"] size lo: 0x%"PRIx32
+mhp_acpi_read_size_hi(uint32_t slot, uint32_t size) "slot[0x%"PRIx32"] size hi: 0x%"PRIx32
+mhp_acpi_read_pxm(uint32_t slot, uint32_t pxm) "slot[0x%"PRIx32"] proximity: 0x%"PRIx32
+mhp_acpi_read_flags(uint32_t slot, uint32_t flags) "slot[0x%"PRIx32"] flags: 0x%"PRIx32
+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"
