tpm/ibmvtpm: Additional LE support for tpm_ibmvtpm_send
authorjmlatten@linux.vnet.ibm.com <jmlatten@linux.vnet.ibm.com>
Sat, 21 Feb 2015 00:11:24 +0000 (18:11 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 26 Mar 2015 14:00:58 +0000 (15:00 +0100)
commit230a7eea686c125a6f982480bc84b586346b4472
tree0a5d39fd11c866cd915fc8c723f0e57895aff3e8
parentd8bee0e3abef10e73a003fdc7ec04ba313334007
tpm/ibmvtpm: Additional LE support for tpm_ibmvtpm_send

commit 62dfd912ab3b5405b6fe72d0135c37e9648071f1 upstream.

Problem: When IMA and VTPM are both enabled in kernel config,
kernel hangs during bootup on LE OS.

Why?: IMA calls tpm_pcr_read() which results in tpm_ibmvtpm_send
and tpm_ibmtpm_recv getting called. A trace showed that
tpm_ibmtpm_recv was hanging.

Resolution: tpm_ibmtpm_recv was hanging because tpm_ibmvtpm_send
was sending CRQ message that probably did not make much sense
to phype because of Endianness. The fix below sends correctly
converted CRQ for LE. This was not caught before because it
seems IMA is not enabled by default in kernel config and
IMA exercises this particular code path in vtpm.

Tested with IMA and VTPM enabled in kernel config and VTPM
enabled on both a BE OS and a LE OS ppc64 lpar. This exercised
CRQ and TPM command code paths in vtpm.
Patch is against Peter's tpmdd tree on github which included
Vicky's previous vtpm le patches.

Signed-off-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Reviewed-by: Ashley Lai <ashley@ahsleylai.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/char/tpm/tpm_ibmvtpm.c
drivers/char/tpm/tpm_ibmvtpm.h