Re: [Xen-API] [PATCH 1 of 5 v2] common/sysctl: Introduce hypercall to query the console ring size

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 12/03/13 17:05, Ian Campbell wrote:
> On Thu, 2013-02-21 at 15:46 +0000, Andrew Cooper wrote:
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Seems pretty obvious to me, any (n)ack from a hypervisor hat wearing
> person?
>
>> diff -r 66f563be41d9 -r 1306e69a7018 xen/common/sysctl.c
>> --- a/xen/common/sysctl.c
>> +++ b/xen/common/sysctl.c
>> @@ -357,6 +357,9 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xe
>>      }
>>      break;
>>  
>> +    case XEN_SYSCTL_consoleringsize:
>> +        ret = console_ring_size(&op->u.consoleringsize);
>> +        break;
>>  
>>      default:
>>          ret = arch_do_sysctl(op, u_sysctl);
>> diff -r 66f563be41d9 -r 1306e69a7018 xen/drivers/char/console.c
>> --- a/xen/drivers/char/console.c
>> +++ b/xen/drivers/char/console.c
>> @@ -226,6 +226,12 @@ long read_console_ring(struct xen_sysctl
>>      return 0;
>>  }
>>  
>> +long console_ring_size(struct xen_sysctl_consoleringsize * op)
>> +{
>> +    op->size = conring_size;
>> +    return 0;
>> +}
>> +
>>  
>>  /*
>>   * *******************************************************
>> diff -r 66f563be41d9 -r 1306e69a7018 xen/include/public/sysctl.h
>> --- a/xen/include/public/sysctl.h
>> +++ b/xen/include/public/sysctl.h
>> @@ -596,6 +596,14 @@ struct xen_sysctl_scheduler_op {
>>  typedef struct xen_sysctl_scheduler_op xen_sysctl_scheduler_op_t;
>>  DEFINE_XEN_GUEST_HANDLE(xen_sysctl_scheduler_op_t);
>>  
>> +/* XEN_SYSCTL_consoleringsize */
>> +/* Get the size of the hypervisor console ring. */
>> +struct xen_sysctl_consoleringsize {
>> +    uint64_t size;
> Is this bytes? Because even 2^32 is a hell of a lot of logging... I
> suppose you could say it was future-proof ;-)
>
>>  /* Written by Xen. */
> The norm in the Xen headers seems to be /* OUT */ above the output
> variables.

Ok - I will make these changes.  I am going to have to rebase this
series back on top of unstable anyway given the latest churn.

~Andrew

>
>> +};
>> +typedef struct xen_sysctl_consoleringsize xen_sysctl_consoleringsize_t;
>> +DEFINE_XEN_GUEST_HANDLE(xen_sysctl_consoleringsize_t);
>> +
>>  struct xen_sysctl {
>>      uint32_t cmd;
>>  #define XEN_SYSCTL_readconsole                    1
>> @@ -616,6 +624,7 @@ struct xen_sysctl {
>>  #define XEN_SYSCTL_numainfo                      17
>>  #define XEN_SYSCTL_cpupool_op                    18
>>  #define XEN_SYSCTL_scheduler_op                  19
>> +#define XEN_SYSCTL_consoleringsize               20
>>      uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
>>      union {
>>          struct xen_sysctl_readconsole       readconsole;
>> @@ -636,6 +645,7 @@ struct xen_sysctl {
>>          struct xen_sysctl_lockprof_op       lockprof_op;
>>          struct xen_sysctl_cpupool_op        cpupool_op;
>>          struct xen_sysctl_scheduler_op      scheduler_op;
>> +        struct xen_sysctl_consoleringsize   consoleringsize;
>>          uint8_t                             pad[128];
>>      } u;
>>  };
>> diff -r 66f563be41d9 -r 1306e69a7018 xen/include/xen/console.h
>> --- a/xen/include/xen/console.h
>> +++ b/xen/include/xen/console.h
>> @@ -12,6 +12,8 @@
>>  
>>  struct xen_sysctl_readconsole;
>>  long read_console_ring(struct xen_sysctl_readconsole *op);
>> +struct xen_sysctl_consoleringsize;
>> +long console_ring_size(struct xen_sysctl_consoleringsize *op);
>>  
>>  void console_init_preirq(void);
>>  void console_init_postirq(void);
>


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