Re: [Xen-devel] [PATCH 1/2] x86/domctl: cleanup

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 13/04/15 15:27, Jan Beulich wrote:
>  >>> On 01.04.15 at 17:31, <andrew.cooper3@xxxxxxxxxx> wrote:
>>      case XEN_DOMCTL_gettscinfo:
>> -    {
>> -        xen_guest_tsc_info_t info;
>> -
>> -        ret = -EINVAL;
>> -        if ( d == current->domain ) /* no domain_pause() */
>> -            break;
>> -
>> -        domain_pause(d);
>> -        tsc_get_info(d, &info.tsc_mode,
>> -                        &info.elapsed_nsec,
>> -                        &info.gtsc_khz,
>> -                        &info.incarnation);
>> -        if ( copy_to_guest(domctl->u.tsc_info.out_info, &info, 1) )
>> -            ret = -EFAULT;
>> +        if ( d == currd ) /* no domain_pause() */
>> +            ret = -EINVAL;
>>          else
>> -            ret = 0;
>> -        domain_unpause(d);
>> -    }
>> -    break;
>> +        {
>> +            xen_guest_tsc_info_t info;
>> +
>> +            domain_pause(d);
>> +            tsc_get_info(d, &info.tsc_mode,
>> +                         &info.elapsed_nsec,
>> +                         &info.gtsc_khz,
>> +                         &info.incarnation);
>> +            domain_unpause(d);
>> +            copyback = 1;
> If you want to use "copyback" here, you need to pass pointers into
> domctl->u.tsc_info.out_info to tsc_get_info().

Oops - completely correct.

I shall spin a v2.

~Andrew

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