automation: PCI passthrough tests on ADL hw

Add simple PCI passthrough test to both PV and HVM domU. It passes
through a network adapter (the only one in the system), gets an IP via
DHCP (first basic test) and then ping the gateway (second basic test).
Finally, if device is supposed to use MSI or MSI-X (as set in the
PCIDEV_INTR test variable), check if it's in use via /proc/interrupts.

On the current runner, the device in question is this:
03:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I225-V [8086:15f3] (rev 03)
	Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:7d25]
	Flags: bus master, fast devsel, latency 0, IRQ 18
	Memory at 50400000 (32-bit, non-prefetchable) [size=1M]
	Memory at 50500000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [40] Power Management version 3
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
	Capabilities: [70] MSI-X: Enable+ Count=5 Masked-
	Capabilities: [a0] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Device Serial Number ...
	Capabilities: [1c0] Latency Tolerance Reporting
	Capabilities: [1f0] Precision Time Measurement
	Capabilities: [1e0] L1 PM Substates
	Kernel driver in use: igc
	Kernel modules: igc

With the current Xen version, it uses MSI-X under PV and MSI under HVM.

This patch moves domU config to a variable, to make it configurable on
per-test basis. Add also a few comments for visual separation of tests.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

automation/gitlab-ci/test.yaml

@@ -94,6 +94,8 @@
     # the test controller runs on RPi4
     CONTAINER: alpine:3.12-arm64v8
     LOGFILE: smoke-test.log
+    PCIDEV: "03:00.0"
+    PCIDEV_INTR: "MSI-X"
   artifacts:
     paths:
       - smoke.serial
@@ -147,6 +149,24 @@ adl-suspend-x86-64-gcc-debug:
     - *x86-64-test-needs
     - alpine-3.12-gcc-debug
 
+adl-pci-pv-x86-64-gcc-debug:
+  extends: .adl-x86-64
+  script:
+    - ./automation/scripts/qubes-x86-64.sh pci-pv 2>&1 | tee ${LOGFILE}
+  needs:
+    - *x86-64-test-needs
+    - alpine-3.12-gcc-debug
+
+adl-pci-hvm-x86-64-gcc-debug:
+  extends: .adl-x86-64
+  variables:
+    PCIDEV_INTR: "MSI"
+  script:
+    - ./automation/scripts/qubes-x86-64.sh pci-hvm 2>&1 | tee ${LOGFILE}
+  needs:
+    - *x86-64-test-needs
+    - alpine-3.12-gcc-debug
+
 qemu-smoke-dom0-arm64-gcc:
   extends: .qemu-arm64
   script:

automation/scripts/qubes-x86-64.sh

@@ -4,8 +4,21 @@ set -ex
 
 test_variant=$1
 
+### defaults
 wait_and_wakeup=
 timeout=120
+domU_config='
+type = "pvh"
+name = "domU"
+kernel = "/boot/vmlinuz"
+ramdisk = "/boot/initrd-domU"
+extra = "root=/dev/ram0 console=hvc0"
+memory = 512
+vif = [ "bridge=xenbr0", ]
+disk = [ ]
+'
+
+### test: smoke test
 if [ -z "${test_variant}" ]; then
     passed="ping test passed"
     domU_check="
@@ -23,6 +36,8 @@ done
 tail -n 100 /var/log/xen/console/guest-domU.log
 echo \"${passed}\"
 "
+
+### test: S3
 elif [ "${test_variant}" = "s3" ]; then
     passed="suspend test passed"
     wait_and_wakeup="started, suspending"
@@ -48,6 +63,62 @@ xl dmesg | grep 'Finishing wakeup from ACPI S3 state' || exit 1
 ping -c 10 192.168.0.2 || exit 1
 echo \"${passed}\"
 "
+
+### test: pci-pv, pci-hvm
+elif [ "${test_variant}" = "pci-pv" ] || [ "${test_variant}" = "pci-hvm" ]; then
+
+    if [ -z "$PCIDEV" ]; then
+        echo "Please set 'PCIDEV' variable with BDF of test network adapter" >&2
+        echo "Optionally set also 'PCIDEV_INTR' to 'MSI' or 'MSI-X'" >&2
+        exit 1
+    fi
+
+    passed="pci test passed"
+
+    domU_config='
+type = "'${test_variant#pci-}'"
+name = "domU"
+kernel = "/boot/vmlinuz"
+ramdisk = "/boot/initrd-domU"
+extra = "root=/dev/ram0 console=hvc0"
+memory = 512
+vif = [ ]
+disk = [ ]
+pci = [ "'$PCIDEV',seize=1" ]
+on_reboot = "destroy"
+'
+
+    domU_check="
+set -x -e
+ip link set eth0 up
+timeout 30s udhcpc -i eth0
+pingip=\$(ip -o -4 r show default|cut -f 3 -d ' ')
+ping -c 10 \"\$pingip\"
+echo domU started
+cat /proc/interrupts
+"
+    if [ "$PCIDEV_INTR" = "MSI-X" ]; then
+        domU_check="$domU_check
+grep -- '\\(-msi-x\\|PCI-MSI-X\\).*eth0' /proc/interrupts
+"
+    elif [ "$PCIDEV_INTR" = "MSI" ]; then
+        # depending on the kernel version and domain type, the MSI can be
+        # marked as '-msi', 'PCI-MSI', or 'PCI-MSI-<SBDF>'; be careful to not match
+        # -msi-x nor PCI-MSI-X
+        domU_check="$domU_check
+grep -- '\\(-msi \\|PCI-MSI\\( \\|-[^X]\\)\\).*eth0' /proc/interrupts
+"
+    fi
+    domU_check="$domU_check
+echo \"${passed}\"
+"
+
+    dom0_check="
+until grep -q \"^domU Welcome to Alpine Linux\" /var/log/xen/console/guest-domU.log; do
+    sleep 1
+done
+tail -n 100 /var/log/xen/console/guest-domU.log
+"
 fi
 
 # DomU
@@ -63,7 +134,7 @@ rm var/run
 echo "#!/bin/sh
 
 ${domU_check}
-/bin/sh" > etc/local.d/xen.start
+" > etc/local.d/xen.start
 chmod +x etc/local.d/xen.start
 echo "rc_verbose=yes" >> etc/rc.conf
 sed -i -e 's/^Welcome/domU \0/' etc/issue
@@ -98,17 +169,7 @@ xl create /etc/xen/domU.cfg
 ${dom0_check}
 " > etc/local.d/xen.start
 chmod +x etc/local.d/xen.start
-# just PVH for now
-echo '
-type = "pvh"
-name = "domU"
-kernel = "/boot/vmlinuz"
-ramdisk = "/boot/initrd-domU"
-extra = "root=/dev/ram0 console=hvc0"
-memory = 512
-vif = [ "bridge=xenbr0", ]
-disk = [ ]
-' > etc/xen/domU.cfg
+echo "$domU_config" > etc/xen/domU.cfg
 
 echo "rc_verbose=yes" >> etc/rc.conf
 echo "XENCONSOLED_TRACE=all" >> etc/default/xencommons