Re: [Xen-devel] [v5][PATCH 1/2] xen:x86:mm:p2m: introduce set_identity_p2m_entry

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.07.14 at 10:46, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 29/07/2014 09:19, Jan Beulich wrote:
>>>>> On 29.07.14 at 09:35, <tiejun.chen@xxxxxxxxx> wrote:
>>> On 2014/7/29 15:05, Jan Beulich wrote:
>>>>>>> On 29.07.14 at 08:40, <tiejun.chen@xxxxxxxxx> wrote:
>>>>> +    struct p2m_domain *p2m = p2m_get_hostp2m(d);
>>>>> +    int ret = -EBUSY;
>>>>> +
>>>>> +    gfn_lock(p2m, gfn, 0);
>>>>> +
>>>>> +    tmp_mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL);
>>>>> +
>>>>> +    if ( mfn_valid(tmp_mfn) )
>>>>> +    {
>>>>> +        gdprintk(XENLOG_ERR,
>>>>> +                 "Overlapping RMRRs at %"PRIx64".\n", (paddr_t)gfn);
>>>> Pointless cast: Just use %lx in the format string. Additionally I don't
>>>> think the message text is correct: You don't really know whether
>>>> what's there is another RMRR (or that the context you're being
>>>> called in refers to an RMRR at all). On the contrary - if it was an
>>>> RMRR (or to be precise, a previously established identity mapping),
>>>> you'd want to report success. And generally we have no stop at
>>>> the end of log messages.
>>> So just print this,
>>>
>>> +        gdprintk(XENLOG_ERR,
>>> +                 "Overlapping at %lx.\n", (paddr_t)gfn);
>> Of course not - such a message is really meaningless.
>>
>> printk(XENLOG_G_WARNING "Cannot identity map %d:%lx, already mapped to 
> %lx\n",
>>        d->domain_id, gfn, mfn_x(mfn));
>>
>> would be a message conveying all information necessary to
>> gain initial understanding of what the issue is.
> 
> This would be better as "map d%d:%lx" to indicate that it is a domid
> before the colon.

I actually meant it to be that way - thanks for noticing.

Jan


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