diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index 9fd0531bc4..1fba0b9d6c 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -1925,6 +1925,174 @@ static int xen_pt_ext_cap_aer_size_init(XenPCIPassthroughState *s,
     return ret;
 }
 
+/* get Root Complex Link Declaration Extended Capability register group size */
+#define RCLD_GET_NUM_ENTRIES(x)     (((x) >> 8) & 0xFF)
+static int xen_pt_ext_cap_rcld_size_init(XenPCIPassthroughState *s,
+                                         const XenPTRegGroupInfo *grp_reg,
+                                         uint32_t base_offset,
+                                         uint32_t *size)
+{
+    uint32_t elem_self_descr = 0;
+
+    int ret = xen_host_pci_get_long(&s->real_device,
+                                    base_offset + 4,
+                                    &elem_self_descr);
+
+    *size = 0x10 + RCLD_GET_NUM_ENTRIES(elem_self_descr) * 0x10;
+
+    log_pcie_extended_cap(s, "Root Complex Link Declaration",
+                          base_offset, *size);
+    return ret;
+}
+
+/* get Access Control Services Extended Capability register group size */
+#define ACS_VECTOR_SIZE_BITS(x)    ((((x) >> 8) & 0xFF) ?: 256)
+static int xen_pt_ext_cap_acs_size_init(XenPCIPassthroughState *s,
+                                        const XenPTRegGroupInfo *grp_reg,
+                                        uint32_t base_offset,
+                                        uint32_t *size)
+{
+    uint16_t acs_caps = 0;
+
+    int ret = xen_host_pci_get_word(&s->real_device,
+                                    base_offset + PCI_ACS_CAP,
+                                    &acs_caps);
+
+    if (acs_caps & PCI_ACS_EC) {
+        uint32_t vector_sz = ACS_VECTOR_SIZE_BITS(acs_caps);
+
+        *size = PCI_ACS_EGRESS_CTL_V + ((vector_sz + 7) & ~7) / 8;
+    } else {
+        *size = PCI_ACS_EGRESS_CTL_V;
+    }
+
+    log_pcie_extended_cap(s, "ACS", base_offset, *size);
+    return ret;
+}
+
+/* get Multicast Extended Capability register group size */
+static int xen_pt_ext_cap_multicast_size_init(XenPCIPassthroughState *s,
+                                              const XenPTRegGroupInfo *grp_reg,
+                                              uint32_t base_offset,
+                                              uint32_t *size)
+{
+    uint8_t dev_type = get_pcie_device_type(s);
+
+    switch (dev_type) {
+    case PCI_EXP_TYPE_ENDPOINT:
+    case PCI_EXP_TYPE_LEG_END:
+    case PCI_EXP_TYPE_RC_END:
+    case PCI_EXP_TYPE_RC_EC:
+    default:
+        *size = PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF;
+        break;
+
+    case PCI_EXP_TYPE_ROOT_PORT:
+    case PCI_EXP_TYPE_UPSTREAM:
+    case PCI_EXP_TYPE_DOWNSTREAM:
+        *size = 0x30;
+        break;
+    }
+
+    log_pcie_extended_cap(s, "Multicast", base_offset, *size);
+    return 0;
+}
+
+/* get Dynamic Power Allocation Extended Capability register group size */
+static int xen_pt_ext_cap_dpa_size_init(XenPCIPassthroughState *s,
+                                        const XenPTRegGroupInfo *grp_reg,
+                                        uint32_t base_offset,
+                                        uint32_t *size)
+{
+    uint32_t dpa_caps = 0;
+    uint32_t num_entries;
+
+    int ret = xen_host_pci_get_long(&s->real_device,
+                                    base_offset + PCI_DPA_CAP,
+                                    &dpa_caps);
+
+    num_entries = (dpa_caps & PCI_DPA_CAP_SUBSTATE_MASK) + 1;
+
+    *size = PCI_DPA_BASE_SIZEOF + num_entries /*byte-size registers*/;
+
+    log_pcie_extended_cap(s, "Dynamic Power Allocation", base_offset, *size);
+    return ret;
+}
+
+/* get TPH Requester Extended Capability register group size */
+static int xen_pt_ext_cap_tph_size_init(XenPCIPassthroughState *s,
+                                        const XenPTRegGroupInfo *grp_reg,
+                                        uint32_t base_offset,
+                                        uint32_t *size)
+{
+    uint32_t tph_caps = 0;
+    uint32_t num_entries;
+
+    int ret = xen_host_pci_get_long(&s->real_device,
+                                    base_offset + PCI_TPH_CAP,
+                                    &tph_caps);
+
+    switch(tph_caps & PCI_TPH_CAP_LOC_MASK) {
+    case PCI_TPH_LOC_CAP:
+        num_entries = (tph_caps & PCI_TPH_CAP_ST_MASK) >> PCI_TPH_CAP_ST_SHIFT;
+        num_entries++;
+        break;
+
+    case PCI_TPH_LOC_NONE:
+    case PCI_TPH_LOC_MSIX:
+    default:
+        /* not in the capability */
+        num_entries = 0;
+    }
+
+    *size = PCI_TPH_BASE_SIZEOF + num_entries * 2;
+
+    log_pcie_extended_cap(s, "TPH Requester", base_offset, *size);
+    return ret;
+}
+
+/* get Downstream Port Containment Extended Capability register group size */
+static int xen_pt_ext_cap_dpc_size_init(XenPCIPassthroughState *s,
+                                        const XenPTRegGroupInfo *grp_reg,
+                                        uint32_t base_offset,
+                                        uint32_t *size)
+{
+    uint16_t dpc_caps = 0;
+
+    int ret = xen_host_pci_get_word(&s->real_device,
+                                    base_offset + PCI_EXP_DPC_CAP,
+                                    &dpc_caps);
+
+    if (dpc_caps & PCI_EXP_DPC_CAP_RP_EXT) {
+        *size = 0x20 + ((dpc_caps & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8) * 4;
+    } else {
+        *size = 0xC;
+    }
+
+    log_pcie_extended_cap(s, "Downstream Port Containment",
+                          base_offset, *size);
+    return ret;
+}
+
+/* get Protocol Multiplexing Extended Capability register group size */
+#define PMUX_GET_NUM_ENTRIES(x)     ((x) & 0x3F)
+static int xen_pt_ext_cap_pmux_size_init(XenPCIPassthroughState *s,
+                                         const XenPTRegGroupInfo *grp_reg,
+                                         uint32_t base_offset,
+                                         uint32_t *size)
+{
+    uint32_t pmux_caps = 0;
+
+    int ret = xen_host_pci_get_long(&s->real_device,
+                                    base_offset + 4,
+                                    &pmux_caps);
+
+    *size = 0x10 + PMUX_GET_NUM_ENTRIES(pmux_caps) * 4;
+
+    log_pcie_extended_cap(s, "PMUX", base_offset, *size);
+    return ret;
+}
+
 static const XenPTRegGroupInfo xen_pt_emu_reg_grps[] = {
     /* Header Type0 reg group */
     {
@@ -2200,6 +2368,62 @@ static const XenPTRegGroupInfo xen_pt_emu_reg_grps[] = {
         .size_init  = xen_pt_ext_cap_aer_size_init,
         .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
     },
+    /* Root Complex Link Declaration Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_RCLD),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_rcld_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* Access Control Services Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_ACS),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_acs_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* Multicast Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_MCAST),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_multicast_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* Dynamic Power Allocation Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_DPA),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_dpa_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* TPH Requester Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_TPH),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_tph_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* Protocol Multiplexing Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_PMUX),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_pmux_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
+    /* Downstream Port Containment Extended Capability reg group */
+    {
+        .grp_id     = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_DPC),
+        .grp_type   = XEN_PT_GRP_TYPE_EMU,
+        .grp_size   = 0xFF,
+        .size_init  = xen_pt_ext_cap_dpc_size_init,
+        .emu_regs   = xen_pt_ext_cap_emu_reg_dummy,
+    },
     {
         .grp_size = 0,
     },
