Re: [Xen-devel] [PATCH 5/8] kexec: extend hypercall with improved load/unload ops

[David Vrabel <david.vrabel@citrix.com>]

On 17/04/13 09:55, Jan Beulich wrote:
>>>> On 16.04.13 at 19:13, David Vrabel <david.vrabel@citrix.com> wrote:
>> -static int kexec_exec(XEN_GUEST_HANDLE_PARAM(void) uarg)
>> +static int kexec_load(XEN_GUEST_HANDLE_PARAM(void) uarg)
>>  {
>> -    xen_kexec_exec_t exec;
>> -    xen_kexec_image_t *image;
>> -    int base, bit, pos, ret = -EINVAL;
>> +    xen_kexec_load_t load;
>> +    xen_kexec_segment_t *segments;
>> +    struct kexec_image *kimage = NULL;
>> +    int ret;
>>  
>> -    if ( unlikely(copy_from_guest(&exec, uarg, 1)) )
>> +    if ( copy_from_guest(&load, uarg, 1) )
>>          return -EFAULT;
>>  
>> -    if ( kexec_load_get_bits(exec.type, &base, &bit) )
>> +    if ( load.nr_segments >= KEXEC_SEGMENT_MAX )
>>          return -EINVAL;
> 
> Especially since you named the padding field _rsvd, you ought
> to verify it to be zero somewhere here. Or if you're really sure
> that nobody will ever want to make use of the field, name it
> _pad instead.

8 bits isn't likely to be useful and the interface can always be
extended by adding a new sub-ob.  I'll rename it to _pad.

Do you want to put your acked-by on this patch (with this change) or on
any of the other patches?

David

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