linux-kernel - Re: [PATCH v3 2/2] tpm: Detach page allocation from tpm

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Date:   Fri, 04 Oct 2019 10:41:42 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org
Cc:     Jerry Snitselaar <jsnitsel@...hat.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] tpm: Detach page allocation from tpm_buf

On Fri, 2019-10-04 at 13:37 -0400, Mimi Zohar wrote:
> On Fri, 2019-10-04 at 09:37 -0700, James Bottomley wrote:
> > On Thu, 2019-10-03 at 21:51 +0300, Jarkko Sakkinen wrote:
> > > As has been seen recently, binding the buffer allocation and
> > > tpm_buf
> > > together is sometimes far from optimal.
> > 
> > Can you elaborate on this a bit more?  I must have missed the
> > discussion.
> 
> Refer to e13cd21ffd50 ("tpm: Wrap the buffer from the caller to
> tpm_buf in tpm_send()") for the details.

Yes, I get that, but to my mind that calls for moving the
tpm_init/destroy_buf into the callers of tpm_send (which, for the most
part, already exist), which means there's no need to separate the buf
and data lifetimes.

James