Re: [Xen-devel] [PATCH v3] x86/ept: Allow write-combining on !mfn_valid() MMIO mappings again

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

> From: David Woodhouse [mailto:dwmw2@xxxxxxxxxxxxx]
> Sent: Monday, February 6, 2017 7:33 PM
> 
> On Fri, 2017-01-27 at 10:36 -0500, Konrad Rzeszutek Wilk wrote:
> > . snip ..
> > >
> > > >
> > > > Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxx>
> > > Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> > >
> > > But before committing I'd prefer to have a VMX maintainer ack
> > > too.
> > Who is gone until Feb yth (Spring festival in China).
> 
> Not sure what number that 'y' was supposed to be, but I see Kevin
> posting today... :)
> 
> Would also be very good to have a definitive answer about the safety of
> mixing WC and UC on MMIO mappings on Intel hardware.

answer is yes, it's safe.

Thanks
Kevin

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