From: Jason Andryuk Date: Thu, 6 May 2021 13:59:11 +0000 (-0400) Subject: docs: Warn about incomplete vtpmmgr TPM 2.0 support X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~550 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=93b2558fae83ab3a6a9b48c851d48ccf57be2298;p=xen.git docs: Warn about incomplete vtpmmgr TPM 2.0 support The vtpmmgr TPM 2.0 support is incomplete. Add a warning about that to the documentation so others don't have to work through discovering it is broken. Signed-off-by: Jason Andryuk Acked-by: Andrew Cooper Reviewed-by: Daniel P. Smith --- diff --git a/docs/man/xen-vtpmmgr.7.pod b/docs/man/xen-vtpmmgr.7.pod index af825a7ffe..875dcce508 100644 --- a/docs/man/xen-vtpmmgr.7.pod +++ b/docs/man/xen-vtpmmgr.7.pod @@ -222,6 +222,17 @@ XSM label, not the kernel. =head1 Appendix B: vtpmmgr on TPM 2.0 +=head2 WARNING: Incomplete - cannot persist data + +TPM 2.0 support for vTPM manager is incomplete. There is no support for +persisting an encryption key, so vTPM manager regenerates primary and secondary +key handles each boot. + +Also, the vTPM manger group command implementation hardcodes TPM 1.2 commands. +This means running manage-vtpmmgr.pl fails when the TPM 2.0 hardware rejects +the TPM 1.2 commands. vTPM manager with TPM 2.0 cannot create groups and +therefore cannot persist vTPM contents. + =head2 Manager disk image setup: The vTPM Manager requires a disk image to store its encrypted data. The image