On 16/01/18 14:10, Boris Ostrovsky wrote:
> On 01/12/2018 01:01 PM, Andrew Cooper wrote:
>>
>> + if ( boot_cpu_has(X86_FEATURE_IBRSB) )
>> + {
>> + /*
>> + * Even if we've chosen to not have IBRS set in Xen context, we
>> still
>> + * need the IBRS entry/exit logic to virtualise IBRS support for
>> + * guests.
>> + */
>> + if ( ibrs )
>> + setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_SET);
>> + else
>> + setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_CLEAR);
>> + }
>>
> Are you going to add support for Intel's "Enhanced IBRS" (I think that's
> what they call the "always on" mode")?
I'm not going to touch IBRS_ATT mode until I've got an SDP to develop
against.
Given how many times the IBRS_ATT spec has changed already, I have
little confidence that it will remain unchanged right to the eventual
hardware arrives.
~Andrew
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