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

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Message-ID: <20190927154245.GG10545@linux.intel.com>
Date:   Fri, 27 Sep 2019 18:42:45 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        James Bottomley <James.Bottomley@...senPartnership.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] tpm: Detach page allocation from tpm_buf

On Thu, Sep 26, 2019 at 08:23:24PM +0300, Jarkko Sakkinen wrote:
> As has been seen recently, binding the buffer allocation and tpm_buf
> together is sometimes far from optimal. The buffer might come from the
> caller namely when tpm_send() is used by another subsystem. In addition we
> can stability in call sites w/o rollback (e.g. power events)>
> 
> Take allocation out of the tpm_buf framework and make it purely a wrapper
> for the data buffer.
> 
> Link: https://patchwork.kernel.org/patch/11146585/
> Cc: Mimi Zohar <zohar@...ux.ibm.com>
> Cc: Jerry Snitselaar <jsnitsel@...hat.com>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Cc: Sumit Garg <sumit.garg@...aro.org>
> Cc: Stefan Berger <stefanb@...ux.vnet.ibm.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
> v2:
> * In tpm2_get_random(), TPM2_CC_GET_RANDOM was accidently switch to
>   TPM2_CC_PCR_EXTEND. Now it has been switched back.
Forgot --subject-prefix="PATCH v2".

/Jarkko