Re: [Xen-devel] [PATCH 0/3] mwait support for AMD processors

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.02.19 at 17:25, <Brian.Woods@xxxxxxx> wrote:
> Correct me if I'm wrong, but the Xen's acpi-idle implementation is 
> dependent on dom0 using a AML interpreter and then giving that data back 
> to Xen.  I've heard that this doesn't always work correctly on PV dom0s 
> and doesn't work at all on PVH dom0s.

For C2 and deeper (using entering methods other than HLT) - yes.
The use of HLT is the default with the assumption that this will put
the system in C1 (i.e. with a pretty low wakeup latency); see
default_idle(), cpuidle_init_cpu(), and acpi_idle_do_entry().

Jan



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