acpi: extend aml_field() to support LockRule

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/aml-build.c

@@ -952,11 +952,14 @@ Aml *aml_reserved_field(unsigned length)
 }
 
 /* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefField */
-Aml *aml_field(const char *name, AmlAccessType type, AmlUpdateRule rule)
+Aml *aml_field(const char *name, AmlAccessType type, AmlLockRule lock,
+               AmlUpdateRule rule)
 {
     Aml *var = aml_bundle(0x81 /* FieldOp */, AML_EXT_PACKAGE);
     uint8_t flags = rule << 5 | type;
 
+    flags |= lock << 4; /* LockRule at 4 bit offset */
+
     build_append_namestring(var->buf, "%s", name);
     build_append_byte(var->buf, flags);
     return var;

hw/i386/acpi-build.c

@@ -1130,7 +1130,7 @@ build_ssdt(GArray *table_data, GArray *linker,
 
         aml_append(dev, aml_operation_region("PEOR", AML_SYSTEM_IO,
                                               misc->pvpanic_port, 1));
-        field = aml_field("PEOR", AML_BYTE_ACC, AML_PRESERVE);
+        field = aml_field("PEOR", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
         aml_append(field, aml_named_field("PEPT", 8));
         aml_append(dev, field);
 
@@ -1170,7 +1170,7 @@ build_ssdt(GArray *table_data, GArray *linker,
         /* declare CPU hotplug MMIO region and PRS field to access it */
         aml_append(sb_scope, aml_operation_region(
             "PRST", AML_SYSTEM_IO, pm->cpu_hp_io_base, pm->cpu_hp_io_len));
-        field = aml_field("PRST", AML_BYTE_ACC, AML_PRESERVE);
+        field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
         aml_append(field, aml_named_field("PRS", 256));
         aml_append(sb_scope, field);
 
@@ -1245,7 +1245,7 @@ build_ssdt(GArray *table_data, GArray *linker,
         );
 
         field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
-                          AML_PRESERVE);
+                          AML_NOLOCK, AML_PRESERVE);
         aml_append(field, /* read only */
             aml_named_field(stringify(MEMORY_SLOT_ADDR_LOW), 32));
         aml_append(field, /* read only */
@@ -1259,7 +1259,7 @@ build_ssdt(GArray *table_data, GArray *linker,
         aml_append(scope, field);
 
         field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_BYTE_ACC,
-                          AML_WRITE_AS_ZEROS);
+                          AML_NOLOCK, AML_WRITE_AS_ZEROS);
         aml_append(field, aml_reserved_field(160 /* bits, Offset(20) */));
         aml_append(field, /* 1 if enabled, read only */
             aml_named_field(stringify(MEMORY_SLOT_ENABLED), 1));
@@ -1275,7 +1275,7 @@ build_ssdt(GArray *table_data, GArray *linker,
         aml_append(scope, field);
 
         field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
-                          AML_PRESERVE);
+                          AML_NOLOCK, AML_PRESERVE);
         aml_append(field, /* DIMM selector, write only */
             aml_named_field(stringify(MEMORY_SLOT_SLECTOR), 32));
         aml_append(field, /* _OST event code, write only */

include/hw/acpi/aml-build.h

@@ -48,6 +48,11 @@ typedef enum {
     AML_BUFFER_ACC = 5,
 } AmlAccessType;
 
+typedef enum {
+    AML_NOLOCK = 0,
+    AML_LOCK = 1,
+} AmlLockRule;
+
 typedef enum {
     AML_PRESERVE = 0,
     AML_WRITE_AS_ONES = 1,
@@ -310,7 +315,8 @@ Aml *aml_while(Aml *predicate);
 Aml *aml_package(uint8_t num_elements);
 Aml *aml_buffer(int buffer_size, uint8_t *byte_list);
 Aml *aml_resource_template(void);
-Aml *aml_field(const char *name, AmlAccessType type, AmlUpdateRule rule);
+Aml *aml_field(const char *name, AmlAccessType type, AmlLockRule lock,
+               AmlUpdateRule rule);
 Aml *aml_mutex(const char *name, uint8_t sync_level);
 Aml *aml_acquire(Aml *mutex, uint16_t timeout);
 Aml *aml_release(Aml *mutex);