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Date:   Thu, 26 Nov 2020 01:05:56 -0500
From:   Jon Masters <>
To:     Ben Widawsky <>,
        Dan Williams <>,
        Ira Weiny <>,
        Vishal Verma <>,
        "Kelley, Sean V" <>,
        Bjorn Helgaas <>,
        "Rafael J . Wysocki" <>
Subject: Re: [RFC PATCH 5/9] cxl/mem: Find device capabilities

On 11/11/20 12:43 AM, Ben Widawsky wrote:

> +			dev_dbg(&cxlm->pdev->dev,
> +				   "found UNSUPPORTED Secondary Mailbox capability\n");

Per spec, the secondary mailbox is intended for use by platform 
firmware, so Linux should never be using it anyway. Maybe that message 
is slightly misleading?


P.S. Related - I've severe doubts about the mailbox approach being 
proposed by CXL and have begun to push back through the spec org.

Computer Architect

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