linux-kernel - Re: [PATCH] x86, microcode, AMD: Add support for family 16h processors

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Date:	Thu, 15 Nov 2012 16:26:28 -0500
From:	Boris Ostrovsky <boris.ostrovsky@....com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	<hpa@...or.com>, <mingo@...e.hu>, <tglx@...utronix.de>,
	<herrmann.der.user@...glemail.com>, <bp@...en8.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, microcode, AMD: Add support for family 16h processors



On 11/15/2012 03:45 PM, Henrique de Moraes Holschuh wrote:
> On Thu, 15 Nov 2012, Boris Ostrovsky wrote:
>> Add valid patch size for family 16h processors
>>
>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@....com>
>
> Is this something that needs to go to -stable ?
>
>>   #define F1XH_MPB_MAX_SIZE 2048
>>   #define F14H_MPB_MAX_SIZE 1824
>>   #define F15H_MPB_MAX_SIZE 4096
>> +#define F16H_MPB_MAX_SIZE 3458
>>
>>   	switch (c->x86) {
>>   	case 0x14:
>> @@ -198,6 +199,9 @@ static unsigned int verify_patch_size(int cpu, u32 patch_size,
>>   	case 0x15:
>>   		max_size = F15H_MPB_MAX_SIZE;
>>   		break;
>> +	case 0x16:
>> +		max_size = F16H_MPB_MAX_SIZE;
>> +		break;
>>   	default:
>>   		max_size = F1XH_MPB_MAX_SIZE;
>>   		break;
>
> Because it looks like without this patch, some valid microcode updates
> would be rejected by the kernel...

Right, patch loading will fail.

I wasn't sure whether stable would be appropriate since this is support 
for new HW. OTOH since this would result in loss of functionality one 
could consider this a bug.

-boris

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