[PATCH 0/2] backend/tpm: Resolve issue with TPM 2 DA lockout

[Stefan Berger <stefanb@linux.ibm.com>]

This series of patches resolves an issue with a TPM 2's dictionary attack
lockout logic being triggered upon well-timed VM resets. Normally, the OS
TPM driver sends a TPM2_Shutdown to the TPM 2 upon reboot and before a VM
is reset. However, the OS driver cannot do this when the user resets a VM.
In this case QEMU must send the command because otherwise several well-
timed VM resets will trigger the TPM 2's dictionary attack (DA) logic and
it will then refuse to do certain key-related operations until the DA
logic has timed out.

Regards,
  Stefan

Stefan Berger (2):
  backends/tpm: Record the last command sent to the TPM
  backends/tpm: Send TPM2_Shutdown upon VM reset

 backends/tpm/tpm_emulator.c | 44 +++++++++++++++++++++++++++++++++++++
 backends/tpm/tpm_int.h      |  3 +++
 backends/tpm/tpm_util.c     |  9 ++++++++
 backends/tpm/trace-events   |  1 +
 include/sysemu/tpm_util.h   |  3 +++
 5 files changed, 60 insertions(+)

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2.35.3