1 files changed, 26 insertions, 28 deletions

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 416da318ae..0d78d73894 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -35,6 +35,7 @@
 #include "hw/acpi/acpi-defs.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/cpu.h"
+#include "hw/acpi/piix4.h"
 #include "hw/nvram/fw_cfg.h"
 #include "hw/acpi/bios-linker-loader.h"
 #include "hw/loader.h"
@@ -58,6 +59,7 @@
 #include "hw/i386/x86-iommu.h"
 
 #include "hw/acpi/aml-build.h"
+#include "hw/acpi/pci.h"
 
 #include "qom/qom-qobject.h"
 #include "hw/i386/amd_iommu.h"
@@ -86,11 +88,6 @@
 /* Default IOAPIC ID */
 #define ACPI_BUILD_IOAPIC_ID 0x0
 
-typedef struct AcpiMcfgInfo {
-    uint64_t mcfg_base;
-    uint32_t mcfg_size;
-} AcpiMcfgInfo;
-
 typedef struct AcpiPmInfo {
     bool s3_disabled;
     bool s4_disabled;
@@ -164,16 +161,28 @@ static void init_common_fadt_data(Object *o, AcpiFadtData *data)
     *data = fadt;
 }
 
+static Object *object_resolve_type_unambiguous(const char *typename)
+{
+    bool ambig;
+    Object *o = object_resolve_path_type("", typename, &ambig);
+
+    if (ambig || !o) {
+        return NULL;
+    }
+    return o;
+}
+
 static void acpi_get_pm_info(AcpiPmInfo *pm)
 {
-    Object *piix = piix4_pm_find();
-    Object *lpc = ich9_lpc_find();
+    Object *piix = object_resolve_type_unambiguous(TYPE_PIIX4_PM);
+    Object *lpc = object_resolve_type_unambiguous(TYPE_ICH9_LPC_DEVICE);
     Object *obj = piix ? piix : lpc;
     QObject *o;
     pm->cpu_hp_io_base = 0;
     pm->pcihp_io_base = 0;
     pm->pcihp_io_len = 0;
 
+    assert(obj);
     init_common_fadt_data(obj, &pm->fadt);
     if (piix) {
         /* w2k requires FADT(rev1) or it won't boot, keep PC compatible */
@@ -192,7 +201,6 @@ static void acpi_get_pm_info(AcpiPmInfo *pm)
         pm->fadt.flags |= 1 << ACPI_FADT_F_RESET_REG_SUP;
         pm->cpu_hp_io_base = ICH9_CPU_HOTPLUG_IO_BASE;
     }
-    assert(obj);
 
     /* The above need not be conditional on machine type because the reset port
      * happens to be the same on PIIX (pc) and ICH9 (q35). */
@@ -228,8 +236,8 @@ 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();
+    Object *piix = object_resolve_type_unambiguous(TYPE_PIIX4_PM);
+    Object *lpc = object_resolve_type_unambiguous(TYPE_ICH9_LPC_DEVICE);
     assert(!!piix != !!lpc);
 
     if (piix) {
@@ -2401,29 +2409,16 @@ static void
 build_mcfg_q35(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
 {
     AcpiTableMcfg *mcfg;
-    const char *sig;
     int len = sizeof(*mcfg) + 1 * sizeof(mcfg->allocation[0]);
 
     mcfg = acpi_data_push(table_data, len);
-    mcfg->allocation[0].address = cpu_to_le64(info->mcfg_base);
+    mcfg->allocation[0].address = cpu_to_le64(info->base);
     /* Only a single allocation so no need to play with segments */
     mcfg->allocation[0].pci_segment = cpu_to_le16(0);
     mcfg->allocation[0].start_bus_number = 0;
-    mcfg->allocation[0].end_bus_number = PCIE_MMCFG_BUS(info->mcfg_size - 1);
+    mcfg->allocation[0].end_bus_number = PCIE_MMCFG_BUS(info->size - 1);
 
-    /* MCFG is used for ECAM which can be enabled or disabled by guest.
-     * To avoid table size changes (which create migration issues),
-     * always create the table even if there are no allocations,
-     * but set the signature to a reserved value in this case.
-     * ACPI spec requires OSPMs to ignore such tables.
-     */
-    if (info->mcfg_base == PCIE_BASE_ADDR_UNMAPPED) {
-        /* Reserved signature: ignored by OSPM */
-        sig = "QEMU";
-    } else {
-        sig = "MCFG";
-    }
-    build_header(linker, table_data, (void *)mcfg, sig, len, 1, NULL, NULL);
+    build_header(linker, table_data, (void *)mcfg, "MCFG", len, 1, NULL, NULL);
 }
 
 /*
@@ -2590,12 +2585,15 @@ static bool acpi_get_mcfg(AcpiMcfgInfo *mcfg)
     if (!o) {
         return false;
     }
-    mcfg->mcfg_base = qnum_get_uint(qobject_to(QNum, o));
+    mcfg->base = qnum_get_uint(qobject_to(QNum, o));
     qobject_unref(o);
+    if (mcfg->base == PCIE_BASE_ADDR_UNMAPPED) {
+        return false;
+    }
 
     o = object_property_get_qobject(pci_host, PCIE_HOST_MCFG_SIZE, NULL);
     assert(o);
-    mcfg->mcfg_size = qnum_get_uint(qobject_to(QNum, o));
+    mcfg->size = qnum_get_uint(qobject_to(QNum, o));
     qobject_unref(o);
     return true;
 }