On Thu, Mar 19, 2020 at 09:55:03PM +0200, Jarkko Sakkinen wrote:
> On Thu, Mar 19, 2020 at 09:50:16PM +0200, Jarkko Sakkinen wrote:
> > 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@xxxxxxxxxx>
> > > Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> > > Signed-off-by: George Wilson <gcwilson@xxxxxxxxxxxxx>
> > > Tested-by: Linh Pham <phaml@xxxxxxxxxx>
> > > Fixes: 132f76294744 ("Add new device driver to support IBM vTPM")
> >
> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
>
> Unfortunately have to take that back because it has checkpatch
> errors:
>
> $ scripts/checkpatch.pl 0001-tpm-ibmvtpm-retry-on-H_CLOSED-in-tpm_ibmvtpm_send.patch
> WARNING: Possible unwrapped commit description (prefer a maximum 75 chars per line)
> #11:
> “partner partition suspended” transport event disables the associated CRQ
I'd noticed that but it appears to be a spurious checkpatch warning.
The line is 73 chars long, the same as the first line of the commit
description. Maybe the quotes throw it off?
>
> WARNING: Prefer using '"%s...", __func__' to using 'ibmvtpm_crq_send_init', this function's name, in a string
> #61: FILE: drivers/char/tpm/tpm_ibmvtpm.c:152:
> + "ibmvtpm_crq_send_init failed rc=%d\n", rc);
I didn't change that error string because it's in an unmodified existing
function that I moved above the caller so a declaration wasn't required.
All other examples in the file are the same. I'm of course happy to
change it in this function if you think it's appropriate to do so.
>
> Also the fixes tag is incorrect. Should be:
>
> Fixes: 132f76294744 ("drivers/char/tpm: Add new device driver to support IBM vTPM")
I see it done different ways, mostly without the path, even for the TPM
drivers. For example, there's no path in Stefan's "[PATCH v7 2/3] tpm:
ibmvtpm: Wait for buffer to be set before proceeding." I'm certainly
happy to change it, however, and it's good to know that's the preferred
style going forward.
Separate topic: Since this fixes a migration hang, do you think it
should also be cc'd to stable?
>
> /Jarkko
--
George Wilson
IBM Linux Technology Center
Security Development
