Add support for cancelling of a TPM command
commit92dcc234ec1f266fb5d59bed77d66320c2c75965
authorStefan Berger <stefanb@linux.vnet.ibm.com>
Wed, 27 Feb 2013 17:47:54 +0000 (27 12:47 -0500)
committerAnthony Liguori <aliguori@us.ibm.com>
Tue, 12 Mar 2013 18:40:55 +0000 (12 13:40 -0500)
treea3d77a2a769ea5b546e284f837024ac442527048
parent4549a8b7ee3c47155c09582f31086f7d0ba61fc4
Add support for cancelling of a TPM command

This patch adds support for cancelling an executing TPM command.
In Linux for example a user can cancel a command through the TPM's
sysfs 'cancel' entry using

echo "1" > /sysfs/class/misc/tpm0/device/cancel

This patch propagates the cancellation of a command inside a VM
to the host TPM's sysfs entry.
It also uses the possibility to cancel the command before QEMU VM
shutdown or reboot, which helps in preventing QEMU from hanging while
waiting for the completion of the command.
To relieve higher layers or users from having to determine the TPM's
cancel sysfs entry, the driver searches for the entry in well known
locations.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com>
Message-id: 1361987275-26289-7-git-send-email-stefanb@linux.vnet.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
qemu-options.hx
tpm/tpm_passthrough.c
vl.c