Re: [Xen-devel] [PATCH v8 10/16] microcode/amd: call svm_host_osvw_init() in common code

[Chao Gao <chao.gao@xxxxxxxxx>]

On Fri, Aug 02, 2019 at 03:21:55PM +0000, Jan Beulich wrote:
>On 01.08.2019 12:22, Chao Gao wrote:
>> --- a/xen/arch/x86/microcode.c
>> +++ b/xen/arch/x86/microcode.c
>> @@ -277,6 +277,9 @@ static long do_microcode_update(void *_info)
>>       if ( error )
>>           info->error = error;
>>   
>> +    if ( microcode_ops->end_update )
>> +        microcode_ops->end_update();
>> +
>>       info->cpu = cpumask_next(info->cpu, &cpu_online_map);
>>       if ( info->cpu < nr_cpu_ids )
>>           return continue_hypercall_on_cpu(info->cpu, do_microcode_update, 
>> info);
>
>This being the only change in this file - don't you also need to
>alter the early ucode loading path?

Yes. I should have.

>
>> @@ -631,11 +622,19 @@ static int start_update(void)
>>       return 0;
>>   }
>>   
>> +static void end_update(void)
>> +{
>> +#if CONFIG_HVM
>> +    svm_host_osvw_init();
>> +#endif
>> +}
>
>Instead of leaving an empty function in the !HVM case, ...
>
>>   static const struct microcode_ops microcode_amd_ops = {
>>       .cpu_request_microcode            = cpu_request_microcode,
>>       .collect_cpu_info                 = collect_cpu_info,
>>       .apply_microcode                  = apply_microcode,
>>       .start_update                     = start_update,
>> +    .end_update                       = end_update,
>
>... could you please leave this pointer uninitialized (i.e.
>NULL) in that case?

Will do.

Thanks
Chao

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