| Xen Device Emulation Backend (``xenpvh``) |
| ========================================= |
| |
| This machine is a little unusual compared to others as QEMU just acts |
| as an IOREQ server to register/connect with Xen Hypervisor. Control of |
| the VMs themselves is left to the Xen tooling. |
| |
| 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 in the :ref:`tpm-device` section. |
| |
| 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. |
