pvmfw: Update README.md to explain pvmfw-tool
Bug: 289627688
Test: Manually
Change-Id: I3f9fed0e5ef10e0dbbae097a13f146f9d67117ad
diff --git a/pvmfw/README.md b/pvmfw/README.md
index cccd8c1..124ef89 100644
--- a/pvmfw/README.md
+++ b/pvmfw/README.md
@@ -427,22 +427,23 @@
and its configuration data.
As a quick prototyping solution, a valid BCC (such as the [bcc.dat] test file)
-can be appended to the `pvmfw.bin` image, making use of the "legacy" mode that
-predates the configuration data format:
+can be appended to the `pvmfw.bin` image with `pvmfw-tool`.
```shell
-m pvmfw_bin
-cp out/target/product/generic_arm64/system/etc/pvmfw.bin ${PVMFW_BIN}
-truncate -s '%4KiB' ${PVMFW_BIN} && cat ${CONFIG_OR_BCC} >> ${PVMFW_BIN}
+m pvmfw-tool pvmfw_bin
+PVMFW_BIN=${ANDROID_PRODUCT_OUT}/system/etc/pvmfw.bin
+BCC_DAT=${ANDROID_BUILD_TOP}/packages/modules/Virtualization/tests/pvmfw/assets/bcc.dat
+
+pvmfw-tool custom_pvmfw ${PVMFW_BIN} ${BCC_DAT}
```
The result can then be pushed to the device. Pointing the system property
`hypervisor.pvmfw.path` to it will cause AVF to use that image as pvmfw:
```shell
-adb push ${PVMFW_BIN} /data/local/tmp/pvmfw.img
+adb push custom_pvmfw /data/local/tmp/pvmfw
adb root
-adb shell setprop hypervisor.pvmfw.path /data/local/tmp/pvmfw.img
+adb shell setprop hypervisor.pvmfw.path /data/local/tmp/pvmfw
```
Then run a protected VM, for example: