From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============5290019223505923252==" MIME-Version: 1.0 From: Scheie, Peter M Subject: [tpm2] best way to verify tpm is alive Date: Thu, 27 Sep 2018 20:24:39 +0000 Message-ID: <3ca4069b2e3846fdba7e1d5d201b7e55@AZDC-MMB02.GD-MS.US> List-ID: To: tpm2@lists.01.org --===============5290019223505923252== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable What is the best way to verify the TPM is available, that is, that it hasn'= t died? I have a requirement to send an alert if the TPM stops working. W= e have snmp processes that run every five seconds, so I figure I can, say, = check for something in /sys/class/tpm/tpm0 and as long as I get an expected= response, I'll report that everything is fine. But what exactly should I = look for? Is the simple presence of /sys/class/tpm/tpm0 sufficient, becaus= e it means the kernel thinks the TPM is there? If I cat /sys/class/tpm/tpm= 0/dev I get the major and minor numbers; I could look at those, or just tes= t for the presence of the dev file on the premise that if the TPM failed th= at file would disappear. Is that a good test? Suggestions? 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