Re: [Xen-devel] [PATCH 2/2] x86: drop cpu_has_sse{,2}

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.12.16 at 14:00, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 09/12/16 11:54, Jan Beulich wrote:
>> Commit dc88221c97 ("x86: rename XMM* features to SSE*") pointlessly
>> added them - these features are always available on 64-bit CPUs. (Let's
>> not assume this for MMX though in at least the insn emulator.)
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> This isn't necessarily true when compiled for 32bit in the userspace
> harness.

In the test harness vcpu_has_* == cpu_has_*, as also
demonstrated by

#define host_and_vcpu_must_have(feat) vcpu_must_have(feat)

. The change (as its title is trying to say) really only affects the
hypervisor.

Jan


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