From mboxrd@z Thu Jan 1 00:00:00 1970 From: jsnitsel@redhat.com (Jerry Snitselaar) Date: Fri, 24 Mar 2017 11:25:57 -0700 Subject: [PATCH v4] tpm_crb: request and relinquish locality 0 In-Reply-To: <20170324101032.13496-1-jarkko.sakkinen@iki.fi> References: <20170324101032.13496-1-jarkko.sakkinen@iki.fi> Message-ID: <87lgru7cqy.fsf@redhat.com> To: linux-security-module@vger.kernel.org List-Id: linux-security-module.vger.kernel.org Jarkko Sakkinen @ 2017-03-24 10:10 GMT: > This commit adds support for requesting and relinquishing locality 0 in > tpm_crb for the course of command transmission. > > In order to achieve this, two new callbacks are added to struct > tpm_class_ops: > > - request_locality > - relinquish_locality > > With CRB interface you first set either requestAccess or relinquish bit > from TPM_LOC_CTRL_x register and then wait for locAssigned and > tpmRegValidSts bits to be set in the TPM_LOC_STATE_x register. > > The reason why were are doing this is to make sure that the driver > will work properly with Intel TXT that uses locality 2. There's no > explicit guarantee that it would relinquish this locality. In more > general sense this commit enables tpm_crb to be a well behaving > citizen in a multi locality environment. > > Signed-off-by: Jarkko Sakkinen Reviewed-by: Jerry Snitselaar Tested-by: Jerry Snitselaar Tested on kabylake system that was hitting issues with earlier iteration. Still don't have platform to test it dealing with multi-locality enviroment. -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html