drivers/tpm: add xen tpmfront interface

This is a complete rewrite of the Xen TPM frontend driver, taking
advantage of a simplified frontend/backend interface and adding support
for cancellation and timeouts.  The backend for this driver is provided
by a vTPM stub domain using the interface in Xen 4.3.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Peter Huewe <peterhuewe@gmx.de>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index dbfd56446c31..205ed35c1a31 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -91,4 +91,15 @@ config TCG_ST33_I2C
         To compile this driver as a module, choose M here; the module will be
         called tpm_stm_st33_i2c.
 
+config TCG_XEN
+        tristate "XEN TPM Interface"
+        depends on TCG_TPM && XEN
+        ---help---
+          If you want to make TPM support available to a Xen user domain,
+          say Yes and it will be accessible from within Linux. See
+          the manpages for xl, xl.conf, and docs/misc/vtpm.txt in
+          the Xen source repository for more details.
+          To compile this driver as a module, choose M here; the module
+          will be called xen-tpmfront.
+
 endif # TCG_TPM