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

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Message-ID: <20200227164046.GA1936@us.ibm.com>
Date:   Thu, 27 Feb 2020 10:40:46 -0600
From:   George Wilson <gcwilson@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.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] tpm: ibmvtpm: retry on H_CLOSED in tpm_ibmvtpm_send()

On Thu, Feb 27, 2020 at 06:23:39PM +0200, Jarkko Sakkinen wrote:
> On Thu, Feb 27, 2020 at 10:50:03AM -0500, George Wilson wrote:
> > tpm_ibmvtpm_send() can fail during LPM 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>
> 
> What is LPM anyway?

It's PowerVM Live Partition Mobility.

> 
> /Jarkko

-- 
George Wilson
IBM Linux Technology Center
Security Development