linux-kernel - Re: [PATCH v6 2/3] tpm: ibmvtpm: Wait for buffer to be set before proceeding

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Date:   Thu, 05 Mar 2020 13:21:03 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org
Cc:     aik@...abs.ru, david@...son.dropbear.id.au,
        linux-kernel@...r.kernel.org, nayna@...ux.vnet.ibm.com,
        gcwilson@...ux.ibm.com, jgg@...pe.ca,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v6 2/3] tpm: ibmvtpm: Wait for buffer to be set before
 proceeding

On Wed, 2020-03-04 at 08:22 -0500, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
> 
> Synchronize with the results from the CRQs before continuing with
> the initialization. This avoids trying to send TPM commands while
> the rtce buffer has not been allocated, yet.
> 
> This patch fixes an existing race condition that may occurr if the
> hypervisor does not quickly respond to the VTPM_GET_RTCE_BUFFER_SIZE
> request sent during initialization and therefore the ibmvtpm->rtce_buf
> has not been allocated at the time the first TPM command is sent.
> 
> Fixes: 132f76294744 ("Add new device driver to support IBM vTPM")
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>

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

/Jarkko