diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 1b62d36101..e9991fd1a7 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -122,6 +122,8 @@ enum {
         #define MANAGEMENT_COMMAND     0x0
     MHD = 0x55,
         #define GET_MHD_INFO 0x0
+    FMAPI_DCD_MGMT = 0x56,
+        #define GET_DCD_INFO 0x0
 };
 
 /* CCI Message Format CXL r3.1 Figure 7-19 */
@@ -3341,6 +3343,62 @@ static CXLRetCode cmd_dcd_release_dyn_cap(const struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
+/*
+ * CXL r3.2 section 7.6.7.6.1: Get DCD Info (Opcode 5600h)
+ */
+static CXLRetCode cmd_fm_get_dcd_info(const struct cxl_cmd *cmd,
+                                      uint8_t *payload_in,
+                                      size_t len_in,
+                                      uint8_t *payload_out,
+                                      size_t *len_out,
+                                      CXLCCI *cci)
+{
+    struct {
+        uint8_t num_hosts;
+        uint8_t num_regions_supported;
+        uint8_t rsvd1[2];
+        uint16_t add_select_policy_bitmask;
+        uint8_t rsvd2[2];
+        uint16_t release_select_policy_bitmask;
+        uint8_t sanitize_on_release_bitmask;
+        uint8_t rsvd3;
+        uint64_t total_dynamic_capacity;
+        uint64_t region_blk_size_bitmasks[8];
+    } QEMU_PACKED *out;
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    CXLDCRegion region;
+    int i;
+
+    if (ct3d->dc.num_regions == 0) {
+        return CXL_MBOX_UNSUPPORTED;
+    }
+
+    out = (void *)payload_out;
+
+    /* TODO: num hosts set to 1 for now */
+    out->num_hosts = 1;
+    out->num_regions_supported = ct3d->dc.num_regions;
+    /* TODO: only prescriptive supported for now */
+    stw_le_p(&out->add_select_policy_bitmask,
+             CXL_EXTENT_SELECTION_POLICY_PRESCRIPTIVE);
+    stw_le_p(&out->release_select_policy_bitmask,
+             CXL_EXTENT_REMOVAL_POLICY_PRESCRIPTIVE);
+    /* TODO: sanitize on release bitmask cleared for now */
+    out->sanitize_on_release_bitmask = 0;
+
+    stq_le_p(&out->total_dynamic_capacity,
+             ct3d->dc.total_capacity / CXL_CAPACITY_MULTIPLIER);
+
+    for (i = 0; i < ct3d->dc.num_regions; i++) {
+        region = ct3d->dc.regions[i];
+        memcpy(&out->region_blk_size_bitmasks[i],
+                &region.supported_blk_size_bitmask, 8);
+    }
+
+    *len_out = sizeof(*out);
+    return CXL_MBOX_SUCCESS;
+}
+
 static const struct cxl_cmd cxl_cmd_set[256][256] = {
     [INFOSTAT][BACKGROUND_OPERATION_ABORT] = { "BACKGROUND_OPERATION_ABORT",
         cmd_infostat_bg_op_abort, 0, 0 },
@@ -3462,6 +3520,11 @@ static const struct cxl_cmd cxl_cmd_set_sw[256][256] = {
                                      cmd_tunnel_management_cmd, ~0, 0 },
 };
 
+static const struct cxl_cmd cxl_cmd_set_fm_dcd[256][256] = {
+    [FMAPI_DCD_MGMT][GET_DCD_INFO] = { "GET_DCD_INFO",
+        cmd_fm_get_dcd_info, 0, 0},
+};
+
 /*
  * While the command is executing in the background, the device should
  * update the percentage complete in the Background Command Status Register
@@ -3764,7 +3827,11 @@ void cxl_initialize_t3_fm_owned_ld_mctpcci(CXLCCI *cci, DeviceState *d,
                                            DeviceState *intf,
                                            size_t payload_max)
 {
+    CXLType3Dev *ct3d = CXL_TYPE3(d);
     cxl_copy_cci_commands(cci, cxl_cmd_set_t3_fm_owned_ld_mctp);
+    if (ct3d->dc.num_regions) {
+        cxl_copy_cci_commands(cci, cxl_cmd_set_fm_dcd);
+    }
     cci->d = d;
     cci->intf = intf;
     cxl_init_cci(cci, payload_max);
diff --git a/hw/cxl/i2c_mctp_cxl.c b/hw/cxl/i2c_mctp_cxl.c
index 7d2cbc3b75..df95182925 100644
--- a/hw/cxl/i2c_mctp_cxl.c
+++ b/hw/cxl/i2c_mctp_cxl.c
@@ -46,6 +46,9 @@
 /* Implementation choice - may make this configurable */
 #define MCTP_CXL_MAILBOX_BYTES 512
 
+/* Supported FMAPI Cmds */
+#define FMAPI_CMD_MAX_OPCODE 0x57
+
 typedef struct CXLMCTPMessage {
     /*
      * DSP0236 (MCTP Base) Integrity Check + Message Type
@@ -200,7 +203,8 @@ static void i2c_mctp_cxl_handle_message(MCTPI2CEndpoint *mctp)
         if (!(msg->message_type == MCTP_MT_CXL_TYPE3 &&
               msg->command_set < 0x51) &&
             !(msg->message_type == MCTP_MT_CXL_FMAPI &&
-              msg->command_set >= 0x51 && msg->command_set < 0x56)) {
+              msg->command_set >= 0x51 &&
+              msg->command_set < FMAPI_CMD_MAX_OPCODE)) {
             buf->rc = CXL_MBOX_UNSUPPORTED;
             st24_le_p(buf->pl_length, len_out);
             s->len = s->pos;
