On Tue, Sep 5, 2017 at 9:03 AM, Richard Henderson <richard.hender...@linaro.org> wrote: > On 09/05/2017 08:53 AM, Peter Maydell wrote: >> 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 <peter.mayd...@linaro.org> >> --- >> include/hw/boards.h | 11 +++++++++++ >> include/qom/cpu.h | 7 ++++++- >> qom/cpu.c | 16 ++++++++++++++++ >> 3 files changed, 33 insertions(+), 1 deletion(-) > > Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Reviewed-by: Alistair Francis <alistair.fran...@xilinx.com> Thanks, Alistair > > > r~ >
