Re: [Xen-devel] [PATCHv2 for-4.6] p2m/ept: Work around hardware errata setting A bit

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 28/09/15 15:03, Jan Beulich wrote:
>>>> On 28.09.15 at 14:43, <tim@xxxxxxx> wrote:
>> At 13:39 +0100 on 28 Sep (1443447574), Ross Lagerwall wrote:
>>> @@ -1150,6 +1152,9 @@ int ept_p2m_init(struct p2m_domain *p2m)
>>>      p2m->memory_type_changed = ept_memory_type_changed;
>>>      p2m->audit_p2m = NULL;
>>>  
>>> +    /* Work around Errata AVR41 on Avaton processors. */
>>> +    cpu_has_ept_ad = boot_cpu_data.x86_model != 0x4d;
>>> +
>> Shouldn't this check the family (a.k.a. boot_cpu_data.x86) too?
> Definitely. Considering that the spec update says that the firmware
> may contain a workaround (microcode update) perhaps even the
> stepping and microcode level would need looking at.

There are no details available as to what firmware fix might be
available, nor how to determine whether the issue is fixed.

~Andrew

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