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-rw-r--r--include/hw/boards.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 3363dd19fd..7f044d101d 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -131,6 +131,16 @@ typedef struct {
* size than the target architecture's minimum. (Attempting to create
* such a CPU will fail.) Note that changing this is a migration
* compatibility break for the machine.
+ * @ignore_memory_transaction_failures:
+ * If this is flag is true then the CPU will ignore memory transaction
+ * failures which should cause the CPU to take an exception due to an
+ * access to an unassigned physical address; the transaction will instead
+ * return zero (for a read) or be ignored (for a write). This should be
+ * set only by legacy board models which rely on the old RAZ/WI behaviour
+ * for handling devices that QEMU does not yet model. New board models
+ * should instead use "unimplemented-device" for all memory ranges where
+ * the guest will attempt to probe for a device that QEMU doesn't
+ * implement and a stub device is required.
*/
struct MachineClass {
/*< private >*/
@@ -171,6 +181,7 @@ struct MachineClass {
bool rom_file_has_mr;
int minimum_page_bits;
bool has_hotpluggable_cpus;
+ bool ignore_memory_transaction_failures;
int numa_mem_align_shift;
void (*numa_auto_assign_ram)(MachineClass *mc, NodeInfo *nodes,
int nb_nodes, ram_addr_t size);