linux-kernel - Re: [PATCH v2] tpm: Restore functionality to xen vtpm driver.

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Message-ID: <20180916192510.GF7473@linux.intel.com>
Date:   Sun, 16 Sep 2018 22:25:10 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     peterhuewe@....de, jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        jgross@...e.com, dunlapg@...ch.edu,
        "Dr. Greg Wettstein" <greg@...d.enjellic.com>,
        "Dr . Greg Wettstein" <greg@...ellic.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] tpm: Restore functionality to xen vtpm driver.

On Thu, Sep 13, 2018 at 05:25:51PM -0400, Boris Ostrovsky wrote:
> From: "Dr. Greg Wettstein" <greg@...d.enjellic.com>
> 
> Functionality of the xen-tpmfront driver was lost secondary to
> the introduction of xenbus multi-page support in commit ccc9d90a9a8b
> ("xenbus_client: Extend interface to support multi-page ring").
> 
> In this commit a pointer to the shared page address was being
> passed to the xenbus_grant_ring() function rather then the
> address of the shared page itself.  This resulted in a situation

I'm sorry but I'm far from being expert with Xen and this sentence
confuses me so maybe could open it up a bit.

For me "shared page address" and "address of the shared page" are
the same thing. What am I missing? I mean just different forms in
english to describe the exact same thing...

/Jarkko