Re: [Qemu-devel] [PATCH 3/3] hw/mips/mips_jazz: Remove no-longer-necessary override of do_unassigned_access

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 8/2/19 6:04 PM, Peter Maydell wrote:
> Now that the MIPS CPU implementation uses the new
> do_transaction_failed hook, we can remove the old code that handled
> the do_unassigned_access hook.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  hw/mips/mips_jazz.c | 27 ++++-----------------------
>  1 file changed, 4 insertions(+), 23 deletions(-)
> 
> diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c
> index c64b4c78809..540943932fd 100644
> --- a/hw/mips/mips_jazz.c
> +++ b/hw/mips/mips_jazz.c
> @@ -111,18 +111,6 @@ static const MemoryRegionOps dma_dummy_ops = {
>  #define MAGNUM_BIOS_SIZE_MAX 0x7e000
>  #define MAGNUM_BIOS_SIZE (BIOS_SIZE < MAGNUM_BIOS_SIZE_MAX ? BIOS_SIZE : MAGNUM_BIOS_SIZE_MAX)
>  
> -static CPUUnassignedAccess real_do_unassigned_access;
> -static void mips_jazz_do_unassigned_access(CPUState *cpu, hwaddr addr,
> -                                           bool is_write, bool is_exec,
> -                                           int opaque, unsigned size)
> -{
> -    if (!is_exec) {
> -        /* ignore invalid access (ie do not raise exception) */
> -        return;
> -    }
> -    (*real_do_unassigned_access)(cpu, addr, is_write, is_exec, opaque, size);
> -}
> -
>  static void (*real_do_transaction_failed)(CPUState *cpu, hwaddr physaddr,
>                                            vaddr addr, unsigned size,
>                                            MMUAccessType access_type,
> @@ -184,9 +172,8 @@ static void mips_jazz_init(MachineState *machine,
>       * However, we can't simply add a global memory region to catch
>       * everything, as this would make all accesses including instruction
>       * accesses be ignored and not raise exceptions.
> -     * So instead we hijack either the do_unassigned_access method or
> -     * the do_transaction_failed method on the CPU, and do not raise exceptions
> -     * for data access.
> +     * So instead we hijack the do_transaction_failed method on the CPU, and
> +     * do not raise exceptions for data access.
>       *
>       * NOTE: this behaviour of raising exceptions for bad instruction
>       * fetches but not bad data accesses was added in commit 54e755588cf1e9
> @@ -197,14 +184,8 @@ static void mips_jazz_init(MachineState *machine,
>       * memory region that catches all memory accesses, as we do on Malta.
>       */
>      cc = CPU_GET_CLASS(cpu);
> -    if (cc->do_unassigned_access) {
> -        real_do_unassigned_access = cc->do_unassigned_access;
> -        cc->do_unassigned_access = mips_jazz_do_unassigned_access;
> -    }
> -    if (cc->do_transaction_failed) {
> -        real_do_transaction_failed = cc->do_transaction_failed;
> -        cc->do_transaction_failed = mips_jazz_do_transaction_failed;
> -    }
> +    real_do_transaction_failed = cc->do_transaction_failed;
> +    cc->do_transaction_failed = mips_jazz_do_transaction_failed;
>  
>      /* allocate RAM */
>      memory_region_allocate_system_memory(ram, NULL, "mips_jazz.ram",
> 

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>