linux-kernel - RE: [PATCH V14 7/7] cxl/port: Introduce cxl_cdat

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Message-ID: <62d221b999ece_242d29476@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Fri, 15 Jul 2022 19:26:01 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     <ira.weiny@...el.com>, Dan Williams <dan.j.williams@...el.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     Ira Weiny <ira.weiny@...el.com>, Lukas Wunner <lukas@...ner.de>,
        "Alison Schofield" <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        <linux-pci@...r.kernel.org>
Subject: RE: [PATCH V14 7/7] cxl/port: Introduce cxl_cdat_valid()

ira.weiny@ wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The CDAT data is protected by a checksum and should be the proper
> length.
> 
> Introduce cxl_cdat_valid() to validate the data.  While at it check and
> store the sequence number.

I am going to drop this one. Userspace can determine validity when it
parses it. When the kernel grows a CDAT parser it will rely on the
standard validation of ACPI-table-like structures from a future
__acpi_table_parse_entries() derivative for this purpose.