Re: [Xen-devel] [PATCH 1/2] x86/ept: defer enabling of EPT A/D bit until PML get enabled.

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Kai Huang [mailto:kai.huang@xxxxxxxxxxxxxxx]
> Sent: Tuesday, October 20, 2015 10:35 AM
> 
> Existing PML implementation turns on EPT A/D bit unconditionally if PML is
> supported by hardware. This works but enabling of EPT A/D bit can be deferred
> until PML get enabled. There's no point in enabling the extra feature for 
> every
> domain when we're not meaning to use it (yet).
> 
> Also added ASSERT of domain having been paused to ept_flush_pml_buffers to 
> make
> it consistent with ept_enable{disable}_pml.
> 
> Sanity live migration and GUI display were tested on Broadwell Machine.
> 
> Signed-off-by: Kai Huang <kai.huang@xxxxxxxxxxxxxxx>
> Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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