Re: [PATCH 3/4] x86/mce: Translate passed-in GPA to host machine address

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 15/09/15 14:42, Haozhong Zhang wrote:
>
>>> +                mfn = mfn_x(get_gfn(d, gpfn, &t));
>>> +
>>> +                if (mfn == INVALID_MFN) {
>>> +                    put_domain(d);
>>> +                    return x86_mcerr("do_mca inject: illegal MSR value",
>>> +                                     -EINVAL);
>> This message should be better distinguishable from the one further
>> down (or else it's pretty pointless) - perhaps you mean GPFN instead
>> of MSR?
>>
> Yes, I'll change it to "do_mca_inject: illegal GPFN".

Please always always always write useful error messages.  "illegal GPFN"
is useless without also stating which value is believed to be invalid.

Furthermore, per the clarification in c/s e758ed1, "gfn" is the correct
term to use here.

~Andrew