From ed860129acd3fcd0b1e47884e810212aaca4d21b Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 7 Sep 2017 13:54:54 +0100 Subject: boards.h: Define new flag ignore_memory_transaction_failures Define a new MachineClass field 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. We need this for ARM boards, where we're about to implement support for generating external aborts on memory transaction failures. Too many of our legacy board models rely on the RAZ/WI behaviour and we would break currently working guests when their "probe for device" code provoked an external abort rather than a RAZ. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Reviewed-by: Alistair Francis Message-id: 1504626814-23124-2-git-send-email-peter.maydell@linaro.org --- include/hw/boards.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/hw') 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); -- cgit v1.2.3