diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 68e40d9..78758e2 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -54,9 +54,6 @@
 #include "hw/i386/intel_iommu.h"
 #include "hw/timer/hpet.h"
 
-#include "hw/i386/q35-acpi-dsdt.hex"
-#include "hw/i386/acpi-dsdt.hex"
-
 #include "hw/acpi/aml-build.h"
 
 #include "qapi/qmp/qint.h"
@@ -125,24 +122,6 @@ typedef struct AcpiBuildPciBusHotplugState {
     bool pcihp_bridge_en;
 } AcpiBuildPciBusHotplugState;
 
-static void acpi_get_dsdt(AcpiMiscInfo *info)
-{
-    Object *piix = piix4_pm_find();
-    Object *lpc = ich9_lpc_find();
-    assert(!!piix != !!lpc);
-
-    if (piix) {
-        info->is_piix4 = true;
-        info->dsdt_code = AcpiDsdtAmlCode;
-        info->dsdt_size = sizeof AcpiDsdtAmlCode;
-    }
-    if (lpc) {
-        info->is_piix4 = false;
-        info->dsdt_code = Q35AcpiDsdtAmlCode;
-        info->dsdt_size = sizeof Q35AcpiDsdtAmlCode;
-    }
-}
-
 static
 int acpi_add_cpu_info(Object *o, void *opaque)
 {
@@ -241,6 +220,17 @@ static void acpi_get_pm_info(AcpiPmInfo *pm)
 
 static void acpi_get_misc_info(AcpiMiscInfo *info)
 {
+    Object *piix = piix4_pm_find();
+    Object *lpc = ich9_lpc_find();
+    assert(!!piix != !!lpc);
+
+    if (piix) {
+        info->is_piix4 = true;
+    }
+    if (lpc) {
+        info->is_piix4 = false;
+    }
+
     info->has_hpet = hpet_find();
     info->tpm_version = tpm_get_version();
     info->pvpanic_port = pvpanic_port();
@@ -1965,95 +1955,6 @@ build_ssdt(GArray *table_data, GArray *linker,
     /* Reserve space for header */
     acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
 
-    build_dbg_aml(ssdt);
-    if (misc->is_piix4) {
-        sb_scope = aml_scope("_SB");
-        dev = aml_device("PCI0");
-        aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A03")));
-        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
-        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
-        aml_append(sb_scope, dev);
-        aml_append(ssdt, sb_scope);
-
-        build_hpet_aml(ssdt);
-        build_piix4_pm(ssdt);
-        build_piix4_isa_bridge(ssdt);
-        build_isa_devices_aml(ssdt);
-        build_piix4_pci_hotplug(ssdt);
-        build_piix4_pci0_int(ssdt);
-    } else {
-        sb_scope = aml_scope("_SB");
-        aml_append(sb_scope,
-            aml_operation_region("PCST", AML_SYSTEM_IO, 0xae00, 0x0c));
-        aml_append(sb_scope,
-            aml_operation_region("PCSB", AML_SYSTEM_IO, 0xae0c, 0x01));
-        field = aml_field("PCSB", AML_ANY_ACC, AML_NOLOCK, AML_WRITE_AS_ZEROS);
-        aml_append(field, aml_named_field("PCIB", 8));
-        aml_append(sb_scope, field);
-        aml_append(ssdt, sb_scope);
-
-        sb_scope = aml_scope("_SB");
-        dev = aml_device("PCI0");
-        aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A08")));
-        aml_append(dev, aml_name_decl("_CID", aml_eisaid("PNP0A03")));
-        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
-        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
-        aml_append(dev, aml_name_decl("SUPP", aml_int(0)));
-        aml_append(dev, aml_name_decl("CTRL", aml_int(0)));
-        aml_append(dev, build_q35_osc_method());
-        aml_append(sb_scope, dev);
-        aml_append(ssdt, sb_scope);
-
-        build_hpet_aml(ssdt);
-        build_q35_isa_bridge(ssdt);
-        build_isa_devices_aml(ssdt);
-        build_q35_pci0_int(ssdt);
-    }
-
-    build_cpu_hotplug_aml(ssdt);
-    build_memory_hotplug_aml(ssdt, nr_mem, pm->mem_hp_io_base,
-                             pm->mem_hp_io_len);
-
-    scope =  aml_scope("_GPE");
-    {
-        aml_append(scope, aml_name_decl("_HID", aml_string("ACPI0006")));
-
-        aml_append(scope, aml_method("_L00", 0, AML_NOTSERIALIZED));
-
-        if (misc->is_piix4) {
-            method = aml_method("_E01", 0, AML_NOTSERIALIZED);
-            aml_append(method,
-                aml_acquire(aml_name("\\_SB.PCI0.BLCK"), 0xFFFF));
-            aml_append(method, aml_call0("\\_SB.PCI0.PCNT"));
-            aml_append(method, aml_release(aml_name("\\_SB.PCI0.BLCK")));
-            aml_append(scope, method);
-        } else {
-            aml_append(scope, aml_method("_L01", 0, AML_NOTSERIALIZED));
-        }
-
-        method = aml_method("_E02", 0, AML_NOTSERIALIZED);
-        aml_append(method, aml_call0("\\_SB." CPU_SCAN_METHOD));
-        aml_append(scope, method);
-
-        method = aml_method("_E03", 0, AML_NOTSERIALIZED);
-        aml_append(method, aml_call0(MEMORY_HOTPLUG_HANDLER_PATH));
-        aml_append(scope, method);
-
-        aml_append(scope, aml_method("_L04", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L05", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L06", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L07", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L08", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L09", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0A", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0B", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0C", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0D", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0E", 0, AML_NOTSERIALIZED));
-        aml_append(scope, aml_method("_L0F", 0, AML_NOTSERIALIZED));
-    }
-    aml_append(ssdt, scope);
-
     bus = PC_MACHINE(machine)->bus;
     if (bus) {
         QLIST_FOREACH(bus, &bus->child, sibling) {
@@ -2523,18 +2424,113 @@ build_dmar_q35(GArray *table_data, GArray *linker)
 }
 
 static void
-build_dsdt(GArray *table_data, GArray *linker, AcpiMiscInfo *misc)
+build_dsdt(GArray *table_data, GArray *linker,
+           AcpiPmInfo *pm, AcpiMiscInfo *misc)
 {
-    AcpiTableHeader *dsdt;
+    Aml *dsdt, *sb_scope, *scope, *dev, *method, *field;
+    MachineState *machine = MACHINE(qdev_get_machine());
+    uint32_t nr_mem = machine->ram_slots;
+
+    dsdt = init_aml_allocator();
 
-    assert(misc->dsdt_code && misc->dsdt_size);
+    /* Reserve space for header */
+    acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader));
 
-    dsdt = acpi_data_push(table_data, misc->dsdt_size);
-    memcpy(dsdt, misc->dsdt_code, misc->dsdt_size);
+    build_dbg_aml(dsdt);
+    if (misc->is_piix4) {
+        sb_scope = aml_scope("_SB");
+        dev = aml_device("PCI0");
+        aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A03")));
+        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
+        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+        aml_append(sb_scope, dev);
+        aml_append(dsdt, sb_scope);
+
+        build_hpet_aml(dsdt);
+        build_piix4_pm(dsdt);
+        build_piix4_isa_bridge(dsdt);
+        build_isa_devices_aml(dsdt);
+        build_piix4_pci_hotplug(dsdt);
+        build_piix4_pci0_int(dsdt);
+    } else {
+        sb_scope = aml_scope("_SB");
+        aml_append(sb_scope,
+            aml_operation_region("PCST", AML_SYSTEM_IO, 0xae00, 0x0c));
+        aml_append(sb_scope,
+            aml_operation_region("PCSB", AML_SYSTEM_IO, 0xae0c, 0x01));
+        field = aml_field("PCSB", AML_ANY_ACC, AML_NOLOCK, AML_WRITE_AS_ZEROS);
+        aml_append(field, aml_named_field("PCIB", 8));
+        aml_append(sb_scope, field);
+        aml_append(dsdt, sb_scope);
+
+        sb_scope = aml_scope("_SB");
+        dev = aml_device("PCI0");
+        aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A08")));
+        aml_append(dev, aml_name_decl("_CID", aml_eisaid("PNP0A03")));
+        aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
+        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+        aml_append(dev, aml_name_decl("SUPP", aml_int(0)));
+        aml_append(dev, aml_name_decl("CTRL", aml_int(0)));
+        aml_append(dev, build_q35_osc_method());
+        aml_append(sb_scope, dev);
+        aml_append(dsdt, sb_scope);
+
+        build_hpet_aml(dsdt);
+        build_q35_isa_bridge(dsdt);
+        build_isa_devices_aml(dsdt);
+        build_q35_pci0_int(dsdt);
+    }
 
-    memset(dsdt, 0, sizeof *dsdt);
-    build_header(linker, table_data, dsdt, "DSDT",
-                 misc->dsdt_size, 1, NULL);
+    build_cpu_hotplug_aml(dsdt);
+    build_memory_hotplug_aml(dsdt, nr_mem, pm->mem_hp_io_base,
+                             pm->mem_hp_io_len);
+
+    scope =  aml_scope("_GPE");
+    {
+        aml_append(scope, aml_name_decl("_HID", aml_string("ACPI0006")));
+
+        aml_append(scope, aml_method("_L00", 0, AML_NOTSERIALIZED));
+
+        if (misc->is_piix4) {
+            method = aml_method("_E01", 0, AML_NOTSERIALIZED);
+            aml_append(method,
+                aml_acquire(aml_name("\\_SB.PCI0.BLCK"), 0xFFFF));
+            aml_append(method, aml_call0("\\_SB.PCI0.PCNT"));
+            aml_append(method, aml_release(aml_name("\\_SB.PCI0.BLCK")));
+            aml_append(scope, method);
+        } else {
+            aml_append(scope, aml_method("_L01", 0, AML_NOTSERIALIZED));
+        }
+
+        method = aml_method("_E02", 0, AML_NOTSERIALIZED);
+        aml_append(method, aml_call0("\\_SB." CPU_SCAN_METHOD));
+        aml_append(scope, method);
+
+        method = aml_method("_E03", 0, AML_NOTSERIALIZED);
+        aml_append(method, aml_call0(MEMORY_HOTPLUG_HANDLER_PATH));
+        aml_append(scope, method);
+
+        aml_append(scope, aml_method("_L04", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L05", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L06", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L07", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L08", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L09", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0A", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0B", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0C", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0D", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0E", 0, AML_NOTSERIALIZED));
+        aml_append(scope, aml_method("_L0F", 0, AML_NOTSERIALIZED));
+    }
+    aml_append(dsdt, scope);
+
+    /* copy AML table into ACPI tables blob and patch header there */
+    g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
+    build_header(linker, table_data,
+        (void *)(table_data->data + table_data->len - dsdt->buf->len),
+        "DSDT", dsdt->buf->len, 1, NULL);
+    free_aml_allocator();
 }
 
 static GArray *
@@ -2628,7 +2624,6 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
 
     acpi_get_cpu_info(&cpu);
     acpi_get_pm_info(&pm);
-    acpi_get_dsdt(&misc);
     acpi_get_misc_info(&misc);
     acpi_get_pci_info(&pci);
 
@@ -2650,7 +2645,7 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
 
     /* DSDT is pointed to by FADT */
     dsdt = tables_blob->len;
-    build_dsdt(tables_blob, tables->linker, &misc);
+    build_dsdt(tables_blob, tables->linker, &pm, &misc);
 
     /* Count the size of the DSDT and SSDT, we will need it for legacy
      * sizing of ACPI tables.
