Re: [Qemu-devel] [PATCHv2 1/3] spapr: Small fixes to rtas_ibm_get_system_parameter, remove rtas_st_buffer

[Alexey Kardashevskiy <aikbox@gmail.com>]

On 01/19/2016 03:30 PM, David Gibson wrote:
> rtas_st_buffer() appears in spapr.h as though it were a widely used helper,
> but in fact it is only used for saving data in a format used by
> rtas_ibm_get_system_parameter().  This changes it to a local helper more
> specifically for that function.
>
> While we're there fix a couple of small defects in
> rtas_ibm_get_system_parameter:
>    - For the string value SPLPAR_CHARACTERISTICS, it wasn't including the
>      terminating \0 in the length which it should according to LoPAPR
>      7.3.16.1
>    - It now checks that the supplied buffer has at least enough space for
>      the length of the returned data, and returns an error if it does not.
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>   hw/ppc/spapr_rtas.c    | 22 ++++++++++++++++++----
>   include/hw/ppc/spapr.h | 28 +++++++++-------------------
>   2 files changed, 27 insertions(+), 23 deletions(-)
>
> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
> index 34b12a3..32cdd66 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -228,6 +228,20 @@ static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr,
>       env->msr = 0;
>   }
>
> +


Nit: unneeded empty line. Besides that,

Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>



> +static inline int sysparm_st(target_ulong addr, target_ulong len,
> +                             const void *val, uint16_t vallen)
> +{
> +    hwaddr phys = ppc64_phys_to_real(addr);
> +
> +    if (len < 2) {
> +        return RTAS_OUT_SYSPARM_PARAM_ERROR;
> +    }
> +    stw_be_phys(&address_space_memory, phys, vallen);
> +    cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
> +    return RTAS_OUT_SUCCESS;
> +}
> +
>   static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
>                                             sPAPRMachineState *spapr,
>                                             uint32_t token, uint32_t nargs,
> @@ -237,7 +251,7 @@ static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
>       target_ulong parameter = rtas_ld(args, 0);
>       target_ulong buffer = rtas_ld(args, 1);
>       target_ulong length = rtas_ld(args, 2);
> -    target_ulong ret = RTAS_OUT_SUCCESS;
> +    target_ulong ret;
>
>       switch (parameter) {
>       case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
> @@ -249,18 +263,18 @@ static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
>                                             current_machine->ram_size / M_BYTE,
>                                             smp_cpus,
>                                             max_cpus);
> -        rtas_st_buffer(buffer, length, (uint8_t *)param_val, strlen(param_val));
> +        ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
>           g_free(param_val);
>           break;
>       }
>       case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
>           uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
>
> -        rtas_st_buffer(buffer, length, &param_val, sizeof(param_val));
> +        ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
>           break;
>       }
>       case RTAS_SYSPARM_UUID:
> -        rtas_st_buffer(buffer, length, qemu_uuid, (qemu_uuid_set ? 16 : 0));
> +        ret = sysparm_st(buffer, length, qemu_uuid, (qemu_uuid_set ? 16 : 0));
>           break;
>       default:
>           ret = RTAS_OUT_NOT_SUPPORTED;
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 53af76a..1e10fc9 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -408,14 +408,15 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi);
>   #define RTAS_SLOT_PERM_ERR_LOG           2
>
>   /* RTAS return codes */
> -#define RTAS_OUT_SUCCESS            0
> -#define RTAS_OUT_NO_ERRORS_FOUND    1
> -#define RTAS_OUT_HW_ERROR           -1
> -#define RTAS_OUT_BUSY               -2
> -#define RTAS_OUT_PARAM_ERROR        -3
> -#define RTAS_OUT_NOT_SUPPORTED      -3
> -#define RTAS_OUT_NO_SUCH_INDICATOR  -3
> -#define RTAS_OUT_NOT_AUTHORIZED     -9002
> +#define RTAS_OUT_SUCCESS                        0
> +#define RTAS_OUT_NO_ERRORS_FOUND                1
> +#define RTAS_OUT_HW_ERROR                       -1
> +#define RTAS_OUT_BUSY                           -2
> +#define RTAS_OUT_PARAM_ERROR                    -3
> +#define RTAS_OUT_NOT_SUPPORTED                  -3
> +#define RTAS_OUT_NO_SUCH_INDICATOR              -3
> +#define RTAS_OUT_NOT_AUTHORIZED                 -9002
> +#define RTAS_OUT_SYSPARM_PARAM_ERROR            -9999
>
>   /* RTAS tokens */
>   #define RTAS_TOKEN_BASE      0x2000
> @@ -513,17 +514,6 @@ static inline void rtas_st_buffer_direct(target_ulong phys,
>                                 MIN(buffer_len, phys_len));
>   }
>
> -static inline void rtas_st_buffer(target_ulong phys, target_ulong phys_len,
> -                                  uint8_t *buffer, uint16_t buffer_len)
> -{
> -    if (phys_len < 2) {
> -        return;
> -    }
> -    stw_be_phys(&address_space_memory,
> -                ppc64_phys_to_real(phys), buffer_len);
> -    rtas_st_buffer_direct(phys + 2, phys_len - 2, buffer, buffer_len);
> -}
> -
>   typedef void (*spapr_rtas_fn)(PowerPCCPU *cpu, sPAPRMachineState *sm,
>                                 uint32_t token,
>                                 uint32_t nargs, target_ulong args,
>


-- 
Alexey