# XENPVH (`xenpvh`)

This machine creates a IOREQ server to register/connect with Xen Hypervisor.

When TPM is enabled, this machine also creates a tpm-tis-device at a user input tpm base address, adds a TPM emulator and connects to a swtpm application running on host machine via chardev socket. This enables xenpvh to support TPM functionalities for a guest domain.

More information about TPM use and installing swtpm linux application can be found at: docs/specs/tpm.rst.

Example for starting swtpm on host machine: .. code-block:: console

> mkdir /tmp/vtpm2 swtpm socket –tpmstate dir=/tmp/vtpm2 –ctrl type=unixio,path=/tmp/vtpm2/swtpm-sock &

Sample QEMU xenpvh commands for running and connecting with Xen: .. code-block:: console

> qemu-system-aarch64 -xen-domid 1 -chardev socket,id=libxl-cmd,path=qmp-libxl-1,server=on,wait=off -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=qmp-libxenstat-1,server=on,wait=off -mon chardev=libxenstat-cmd,mode=control -xen-attach -name guest0 -vnc none -display none -nographic -machine xenpvh -m 1301 -chardev socket,id=chrtpm,path=tmp/vtpm2/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -machine tpm-base-addr=0x0C000000

In above QEMU command, last two lines are for connecting xenpvh QEMU to swtpm via chardev socket.