docs: started to work on tpm qemu page

Signed-off-by: Boris Glimcher <36732377+glimchb@users.noreply.github.com>

doc/qemu_tpm_setup.md

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+
+# OPI QEMU TPM2 setup
+
+## Docs
+
+- From <https://tpm2-software.github.io/2020/10/19/TPM2-Device-Emulation-With-QEMU.html>
+
+## Virtualization support
+
+Make sure that VT-x/AMD-v support is enabled in BIOS
+
+```bash
+$ lscpu | grep -i virtualization
+Virtualization:                  VT-x
+```
+
+and that kvm modules are loaded
+
+```bash
+$ lsmod | grep -i kvm
+kvm_intel             217088  0
+kvm                   614400  1 kvm_intel
+irqbypass              16384  1 kvm
+```
+
+## Tool installation
+
+Installation on Fedora
+
+```bash
+sudo dnf install qemu-kvm swtpm wget genisoimage
+```
+
+or on Ubuntu
+
+```bash
+sudo apt install qemu-system swtpm wget genisoimage
+```
+
+## Download guest image
+
+get
+
+```bash
+wget -O guest_os_image.qcow2 https://download.fedoraproject.org/pub/fedora/linux/releases/38/Cloud/x86_64/images/Fedora-Cloud-Base-38-1.6.x86_64.qcow2
+```
+
+check
+
+```bash
+$ qemu-img info guest_os_image.qcow2
+image: guest_os_image.qcow2
+file format: qcow2
+virtual size: 5 GiB (5368709120 bytes)
+disk size: 503 MiB
+cluster_size: 65536
+Format specific information:
+    compat: 0.10
+    refcount bits: 16
+```
+
+## Change password
+
+```bash
+cat <<- EOF > meta-data
+instance-id: iid-local01;
+local-hostname: fed38;
+EOF
+
+cat <<- EOF > user-data
+#cloud-config
+password: fedora
+chpasswd: { expire: False }
+ssh_pwauth: True
+EOF
+
+genisoimage -output init.iso -volid cidata -joliet -rock user-data meta-data
+```
+
+## TPM emulation
+
+```bash
+mkdir /tmp/emulated_tpm
+swtpm socket --tpmstate dir=/tmp/emulated_tpm --ctrl type=unixio,path=/tmp/emulated_tpm/swtpm-sock --log level=20 --tpm2
+```
+
+### Run qemu with TPM device
+
+```bash
+qemu-system-x86_64 -smp 2 -cdrom init.iso -m 1G -drive file=guest_os_image.qcow2,if=none,id=disk -device ide-hd,drive=disk,bootindex=0 --nographic
+```
+
+Login using fedora/fedora and run few tests
+
+```bash
+[fedora@fed38 ~]$ dmesg | grep -i tpm
+[    4.061037] ima: No TPM chip found, activating TPM-bypass!
+[    6.204763] systemd[1]: systemd 253.2-1.fc38 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN)
+[   43.258954] systemd[1]: systemd 253.2-1.fc38 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN)
+[   51.961877] systemd[1]: systemd-pcrmachine.service - TPM2 PCR Machine ID Measurement was skipped because of an unmet condition check (ConditionPathExists=/sys/firmware/efi/efivars/StubP.
+
+[fedora@fed38 ~]$ ls -l /dev/tpm*
+ls: cannot access '/dev/tpm*': No such file or directory
+```