linux-kernel - Re: [PATCH v3] tpm: ibmvtpm: retry on H_CLOSED in tpm_ibmvtpm

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Message-ID: <20200319195011.GB24804@linux.intel.com>
Date:   Thu, 19 Mar 2020 21:50:11 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     George Wilson <gcwilson@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Nayna Jain <nayna@...ux.vnet.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-kernel@...r.kernel.org,
        Linh Pham <phaml@...ibm.com>
Subject: Re: [PATCH v3] tpm: ibmvtpm: retry on H_CLOSED in tpm_ibmvtpm_send()

On Wed, Mar 18, 2020 at 07:49:27PM -0400, George Wilson wrote:
> tpm_ibmvtpm_send() can fail during PowerVM Live Partition Mobility resume
> with an H_CLOSED return from ibmvtpm_send_crq().  The PAPR says, 'The
> “partner partition suspended” transport event disables the associated CRQ
> such that any H_SEND_CRQ hcall() to the associated CRQ returns H_Closed
> until the CRQ has been explicitly enabled using the H_ENABLE_CRQ hcall.'
> This patch adds a check in tpm_ibmvtpm_send() for an H_CLOSED return from
> ibmvtpm_send_crq() and in that case calls tpm_ibmvtpm_resume() and
> retries the ibmvtpm_send_crq() once.
> 
> Reported-by: Linh Pham <phaml@...ibm.com>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> Signed-off-by: George Wilson <gcwilson@...ux.ibm.com>
> Tested-by: Linh Pham <phaml@...ibm.com>
> Fixes: 132f76294744 ("Add new device driver to support IBM vTPM")

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Thank you.

/Jarkko