Re: [Xen-devel] [PATCH for-4.6] p2m/ept: Set the A bit only if PML is enabled

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Sep 23, 2015 at 04:18:46PM +0100, Wei Liu wrote:
> With the discussion still not finalised I'm a bit worried that this
> issue will block the release.
> 
> I think we have a few options here. I will list them in order of my
> preference. Please correct me if I'm talking non-sense, and feel free to
> add more options if I miss anything.
> 
> 1. Disable PML on broken chips, gate access to A bit (or AD) with PML.
> 
> In the sub-thread I had with Ross, the proposed patch already does that.
> There is no need to "disable PML in broken chips" because that feature
> is not supported by broken chips in the first place.
> 
> The downside is that the overhead of gating with `if' statement which
> makes things a tad slower for everyone. But that's not really reason to
> reject this patch because any gating method would involve similar
> overhead. 

One could use alternative assembler for this.

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