runtime: Switch to using the rust version of virtiofsd (all but power)

So far this has been done for x86_64.  Now that the support for building
and testing has been added for all arches, let's do the second part of
the switch.

We're still not done yet for powerpc, as some a virtifosd crash on the
rust version has been found by the maintainer.

Fixes: #4258, #4260

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

snap/snapcraft.yaml

@@ -52,6 +52,36 @@ parts:
       curl -LO https://golang.org/dl/${tarfile}
       tar -xf ${tarfile} --strip-components=1
 
+  rustdeps:
+    after: [metadata]
+    plugin: nil
+    prime:
+      - -*
+    build-packages:
+      - curl
+    override-build: |
+      source "${SNAPCRAFT_PROJECT_DIR}/snap/local/snap-common.sh"
+
+      # put everything in stage
+      cd "${SNAPCRAFT_STAGE}"
+
+      version="$(${yq} r ${kata_dir}/versions.yaml languages.rust.meta.newest-version)"
+      if ! command -v rustup > /dev/null; then
+        curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${version}
+      fi
+
+      export PATH=${PATH}:${HOME}/.cargo/bin
+      rustup toolchain install ${version}
+      rustup default ${version}
+      if [ "${arch}" == "ppc64le" ] || [ "${arch}" == "s390x" ] ; then
+        [ ${arch} == "ppc64le"] && arch="powerpc64le"
+        rustup target add ${arch}-unknown-linux-gnu
+      else
+        rustup target add ${arch}-unknown-linux-musl
+        $([ "$(whoami)" != "root" ] && echo sudo) ln -sf /usr/bin/g++ /bin/musl-g++
+      fi
+      rustup component add rustfmt
+
   image:
     after: [godeps, qemu, kernel]
     plugin: nil
@@ -271,25 +301,26 @@ parts:
 
   virtiofsd:
     plugin: nil
-    after: [godeps]
+    after: [godeps, rustdeps]
     override-build: |
       source "${SNAPCRAFT_PROJECT_DIR}/snap/local/snap-common.sh"
 
-      # Currently, only one platform uses the new rust virtiofsd. The
-      # others make use of QEMU's C implementation.
+      # Currently, powerpc makes use of the QEMU's C implementation.
+      # The other platforms make use of the new rust virtiofsd.
       #
       # See "tools/packaging/scripts/configure-hypervisor.sh".
-      if [ "${arch}" = 'x86_64' ]
+      if [ "${arch}" == "ppc64le" ]
       then
-          echo "INFO: Building rust version of virtiofsd"
-      else
           echo "INFO: Building QEMU's C version of virtiofsd"
           # Handled by the 'qemu' part, so nothing more to do here.
           exit 0
+      else
+          echo "INFO: Building rust version of virtiofsd"
       fi
 
       cd "${kata_dir}"
 
+      export PATH=${PATH}:${HOME}/.cargo/bin
       # Download the rust implementation of virtiofsd
       tools/packaging/static-build/virtiofsd/build-static-virtiofsd.sh
       sudo install \

src/runtime/Makefile

@@ -175,9 +175,9 @@ DEFVALIDENTROPYSOURCES := [\"/dev/urandom\",\"/dev/random\",\"\"]
 DEFDISABLEBLOCK := false
 DEFSHAREDFS_CLH_VIRTIOFS := virtio-fs
 DEFSHAREDFS_QEMU_VIRTIOFS := virtio-fs
-DEFVIRTIOFSDAEMON := $(LIBEXECDIR)/kata-qemu/virtiofsd
-ifeq ($(ARCH),amd64)
 DEFVIRTIOFSDAEMON := $(LIBEXECDIR)/virtiofsd
+ifeq ($(ARCH),ppc64le)
+DEFVIRTIOFSDAEMON := $(LIBEXECDIR)/kata-qemu/virtiofsd
 endif
 DEFVALIDVIRTIOFSDAEMONPATHS := [\"$(DEFVIRTIOFSDAEMON)\"]
 # Default DAX mapping cache size in MiB

tools/packaging/scripts/configure-hypervisor.sh

@@ -317,6 +317,29 @@ generate_qemu_options() {
 	# Don't build the qemu-io, qemu-nbd and qemu-image tools
 	qemu_options+=(size:--disable-tools)
 
+	# Kata Containers may be configured to use the virtiofs daemon.
+	#
+	# But since QEMU 5.2 the daemon is built as part of the tools set
+	# (disabled with --disable-tools) thus it needs to be explicitely
+	# enabled.
+	#
+	# From Kata Containers 2.5.0-alpha2 all arches but powerpc have been
+        # using the new implementation of virtiofs daemon, which is not part
+       	# of QEMU.
+	# For the powwer, at least for now, keep building virtiofsd while
+	# building QEMU.
+	case "$arch" in
+	aarch64)
+	        ;;
+	x86_64)
+	        ;;
+	ppc64le)
+	        qemu_options+=(functionality:--enable-virtiofsd)
+	        ;;
+	s390x)
+	        ;;
+	esac
+
 	qemu_options+=(functionality:--enable-virtfs)
 
 	# Don't build linux-user bsd-user