linux-kernel - Re: [PATCH v4] tpm_crb: fix fTPM on AMD Zen+ CPUs

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Message-ID: <20190917190950.GG10244@linux.intel.com>
Date:   Tue, 17 Sep 2019 22:10:13 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Vanya Lazeev <ivan.lazeev@...il.com>
Cc:     Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tpm_crb: fix fTPM on AMD Zen+ CPUs

On Mon, Sep 16, 2019 at 11:00:30PM +0300, Vanya Lazeev wrote:
> On Mon, Sep 16, 2019 at 08:51:30AM +0300, Jarkko Sakkinen wrote:
> > On Sat, Sep 14, 2019 at 08:17:44PM +0300, ivan.lazeev@...il.com wrote:
> > > +	struct list_head acpi_resources, crb_resources;
> > 
> > Please do not create crb_resources. I said this already last time.
> 
> But then, if I'm not mistaken, it will be impossible to track pointers
> to multiple remaped regions. In this particular case, it
> doesn't matter, because both buffers are in different ACPI regions,
> and using acpi_resources only to fix buffer will be enough.
> However, this creates incosistency between single- and
> multiple-region cases: in the latter iobase field of struct crb_priv
> doesn't make any difference. Am I understanding the situation correctly?
> Will such fix be ok?

So why you need to track pointers other than in initialization as devm
will take care of freeing them. Just trying to understand the problem.

/Jarkko