hw/arm/virt-acpi-build: don't save VirtGuestInfo on AcpiBuildState

We can get to VirtMachineState without the need for saving a pointer
on AcpiBuildState. This is the mach-virt equivalent to "acpi: Don't save
PcGuestInfo on AcpiBuildState"
Signed-off-by: NAndrew Jones <drjones@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Message-id: 20170102200153.28864-13-drjones@redhat.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/virt-acpi-build.c

@@ -707,7 +707,6 @@ struct AcpiBuildState {
     MemoryRegion *linker_mr;
     /* Is table patched? */
     bool patched;
-    VirtGuestInfo *guest_info;
 } AcpiBuildState;
 
 static
@@ -791,8 +790,7 @@ static void virt_acpi_build_update(void *build_opaque)
 
     acpi_build_tables_init(&tables);
 
-    virt_acpi_build(container_of(build_state->guest_info,
-                                 VirtMachineState, acpi_guest_info), &tables);
+    virt_acpi_build(VIRT_MACHINE(qdev_get_machine()), &tables);
 
     acpi_ram_update(build_state->table_mr, tables.table_data);
     acpi_ram_update(build_state->rsdp_mr, tables.rsdp);
@@ -842,7 +840,6 @@ void virt_acpi_setup(VirtMachineState *vms)
     }
 
     build_state = g_malloc0(sizeof *build_state);
-    build_state->guest_info = guest_info;
 
     acpi_build_tables_init(&tables);
     virt_acpi_build(vms, &tables);