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Re: [Xen-devel] [PATCH 4/8] tools/libxc: Pre-cleanup for xc_cpuid_{set, apply_policy}()


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 12 Sep 2019 09:38:50 +0100
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  • Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>
  • Delivery-date: Thu, 12 Sep 2019 08:38:57 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 12/09/2019 09:17, Jan Beulich wrote:
> On 11.09.2019 22:05, Andrew Cooper wrote:
>> @@ -935,6 +935,13 @@ int xc_cpuid_set(
>>              goto fail;
>>          }
>>  
>> +        /*
>> +         * Notes for following this algorithm:
>> +         *
>> +         * While it will accept any leaf data, it only makes sense to use on
>> +         * feature leaves.  regs[] initially contains the host values.  
>> This,
>> +         * with the fall-through chain is how the 'k' option works.
>> +         */
>>          for ( j = 0; j < 32; j++ )
>>          {
>>              unsigned char val = !!((regs[i] & (1U << (31 - j))));
> Looking at the next patch (and hence more closely at the code below
> here) - shouldn't the comment mention both 'k' and 's'?

Hmm.  The loop didn't contain any logic looking at == 'k' which is why I
started wondering, but I think you're right - the only use of 's' is for
the feedback to the caller, not for calculation purposes.

I'll adjust the comment suitably.

~Andrew

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