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stefanbergerJarkko Sakkinen
stefanberger
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Jarkko Sakkinen
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tpm: Proxy driver for supporting multiple emulated TPMs
This patch implements a proxy driver for supporting multiple emulated TPMs in a system. The driver implements a device /dev/vtpmx that is used to created a client device pair /dev/tpmX (e.g., /dev/tpm10) and a server side that is accessed using a file descriptor returned by an ioctl. The device /dev/tpmX is the usual TPM device created by the core TPM driver. Applications or kernel subsystems can send TPM commands to it and the corresponding server-side file descriptor receives these commands and delivers them to an emulated TPM. The driver retrievs the TPM 1.2 durations and timeouts. Since this requires the startup of the TPM, we send a startup for TPM 1.2 as well as TPM 2. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> CC: linux-kernel@vger.kernel.org CC: linux-doc@vger.kernel.org CC: linux-api@vger.kernel.org Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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‎drivers/char/tpm/Kconfig

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@@ -122,5 +122,15 @@ config TCG_CRB
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from within Linux. To compile this driver as a module, choose
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M here; the module will be called tpm_crb.
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config TCG_VTPM_PROXY
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tristate "VTPM Proxy Interface"
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depends on TCG_TPM
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---help---
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This driver proxies for an emulated TPM (vTPM) running in userspace.
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A device /dev/vtpmx is provided that creates a device pair
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/dev/vtpmX and a server-side file descriptor on which the vTPM
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can receive commands.
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source "drivers/char/tpm/st33zp24/Kconfig"
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endif # TCG_TPM

‎drivers/char/tpm/Makefile

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@@ -23,3 +23,4 @@ obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
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obj-$(CONFIG_TCG_TIS_ST33ZP24) += st33zp24/
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obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
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obj-$(CONFIG_TCG_CRB) += tpm_crb.o
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obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o

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