linux-kernel - Re: [PATCH v2] tpm: tpm2-space: Resize session and context buffers dynamically

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Message-ID: <031020b9-dc0a-3c2f-32e4-4bb2db4b5a2b@linux.ibm.com>
Date:   Thu, 25 Jun 2020 17:27:50 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-integrity@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Alexey Klimov <aklimov@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tpm: tpm2-space: Resize session and context buffers
 dynamically

On 6/25/20 5:25 PM, Jarkko Sakkinen wrote:
> On Thu, Jun 25, 2020 at 08:41:18AM -0400, Stefan Berger wrote:
>> On 6/25/20 12:38 AM, Jarkko Sakkinen wrote:
>>> Re-allocate context and session buffers when needed. Scale them in page
>>> increments so that the reallocation is only seldomly required, and thus
>>> causes minimal stress to the system. Add a static maximum limit of four
>>> pages for buffer sizes.
>>>
>>> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
>>> Suggested-by: Stefan Berger <stefanb@...ux.ibm.com>
>>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>>
>> You don't want to try a fixes tag? None of the previous versions of this
>> code will work with newer versions of the TPM 2 then...
> It's not a regression.

Ok, so distros will have to backport it.


     Stefan