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Re: [Xen-devel] [PATCH 6/6] x86/emul: dedup hvmemul_cpuid() and pv_emul_cpuid()

>>> On 14.11.18 at 01:20, <Brian.Woods@xxxxxxx> wrote:
> On Mon, Nov 12, 2018 at 01:17:59AM -0700, Jan Beulich wrote:
>> >>> On 09.11.18 at 18:16, <andrew.cooper3@xxxxxxxxxx> wrote:
>> > LWP doesn't exist any more, even on the hardware it used to exist on. 
>> > It was never implemented on Fam17h, and was removed from Fam15/16h in a
>> > microcode update to make room to implement IBPB for Spectre v2 mitigations.
>> > 
>> > I recommend we purge the support completely.
>> I certainly don't mind; I'd prefer though if such a withdrawal of
>> functionality came actually from AMD. Brian?
> LWP support isn't enabled on F15h system with the latest Ucode and it
> isn't available on F17h.  I don't see any reason to keep it if it's
> hampering cleanup and reformatting.

Okay, this confirms your agreement with the removal plans, but is
there any chance the patch removing it could actually come from
an AMD person, as suggested above?


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