Hi Cedric,
On 3/27/23 2:52 AM, Cédric Le Goater wrote:
On 3/27/23 09:47, Joel Stanley wrote:
On Sun, 26 Mar 2023 at 22:44, Ninad Palsule <ni...@linux.ibm.com> wrote:
This is a documentation change for I2C TPM device support.
Qemu already supports devices attached to ISA and sysbus.
This drop adds support for the I2C bus attached TPM devices.
Signed-off-by: Ninad Palsule <ni...@linux.ibm.com>
---
V2:
Incorporated Stephen's review comments
- Added example in the document.
---
V4:
Incorporate Cedric & Stefan's comments
- Added example for ast2600-evb
- Corrected statement about arm virtual machine.
---
V6:
Incorporated review comments from Stefan.
---
docs/specs/tpm.rst | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/docs/specs/tpm.rst b/docs/specs/tpm.rst
index 535912a92b..590e670a9a 100644
--- a/docs/specs/tpm.rst
+++ b/docs/specs/tpm.rst
@@ -21,12 +21,16 @@ QEMU files related to TPM TIS interface:
- ``hw/tpm/tpm_tis_common.c``
- ``hw/tpm/tpm_tis_isa.c``
- ``hw/tpm/tpm_tis_sysbus.c``
+ - ``hw/tpm/tpm_tis_i2c.c``
- ``hw/tpm/tpm_tis.h``
Both an ISA device and a sysbus device are available. The former is
used with pc/q35 machine while the latter can be instantiated in the
Arm virt machine.
+An I2C device support is also provided which can be instantiated in
the Arm
+based emulation machines. This device only supports the TPM 2
protocol.
+
CRB interface
-------------
@@ -348,6 +352,34 @@ In case an Arm virt machine is emulated, use
the following command line:
-drive if=pflash,format=raw,file=flash0.img,readonly=on \
-drive if=pflash,format=raw,file=flash1.img
+In case a ast2600-evb bmc machine is emulated and want to use TPM
device
+attached to I2C bus, use the following command line:
+
+.. code-block:: console
+
+ qemu-system-arm -M ast2600-evb -nographic \
+ -kernel arch/arm/boot/zImage \
+ -dtb arch/arm/boot/dts/aspeed-ast2600-evb.dtb \
+ -initrd rootfs.cpio \
+ -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
+ -tpmdev emulator,id=tpm0,chardev=chrtpm \
+ -device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e
For testing, use this command to load the driver to the correct address:
echo tpm_tis_i2c 0x2e > /sys/bus/i2c/devices/i2c-12/new_device
(I don't know how specific we want to make the instructions, but
adding a line like above would help others from having to re-discover
the command).
or/and add an avocado test for it. See tests/avocado/machine_aspeed.py.
The avocado framework is a bit fragile when reading from the console but
we hope to fix that.
I never used it before so it will take little longer.
Is it required to merge this i2c work?
Thanks for the review.
Ninad
Thanks
C.
+
+In case a Rainier bmc machine is emulated and want to use TPM device
+attached to I2C bus, use the following command line:
+
+.. code-block:: console
+
+ qemu-system-arm -M rainier-bmc -nographic \
+ -kernel ${IMAGEPATH}/fitImage-linux.bin \
+ -dtb ${IMAGEPATH}/aspeed-bmc-ibm-rainier.dtb \
+ -initrd ${IMAGEPATH}/obmc-phosphor-initramfs.rootfs.cpio.xz \
+ -drive
file=${IMAGEPATH}/obmc-phosphor-image.rootfs.wic.qcow2,if=sd,index=2\
+ -net nic -net
user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443\
+ -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
+ -tpmdev emulator,id=tpm0,chardev=chrtpm \
+ -device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e
+
I'd drop this example, the above one is enough.
In case SeaBIOS is used as firmware, it should show the TPM menu item
after entering the menu with 'ESC'.
--
2.37.2
