tests: Add test for PCI usage on RISC-V

This shows users can now use PCI for RISC-V guests, as long
as they opt into it by manually assigning addresses.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

tests/qemuxml2argvdata/riscv64-virt-pci.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-riscv64 \
+-name riscv64 \
+-S \
+-machine virt,accel=tcg,usb=off,dump-guest-core=off \
+-m 2048 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid fd65fc03-8838-4c4d-9d8d-395802488790 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-riscv64/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-kernel /var/lib/libvirt/images/riscv64.bbl \
+-append root=/dev/vda \
+-drive file=/var/lib/libvirt/images/riscv64.qcow2,format=qcow2,if=none,\
+id=drive-virtio-disk0 \
+-device virtio-blk-pci,bus=pcie.0,addr=0x1,drive=drive-virtio-disk0,\
+id=virtio-disk0,bootindex=1

tests/qemuxml2argvdata/riscv64-virt-pci.xml

+<domain type='qemu'>
+  <name>riscv64</name>
+  <uuid>fd65fc03-8838-4c4d-9d8d-395802488790</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='riscv64' machine='virt'>hvm</type>
+    <kernel>/var/lib/libvirt/images/riscv64.bbl</kernel>
+    <cmdline>root=/dev/vda</cmdline>
+  </os>
+  <devices>
+    <emulator>/usr/bin/qemu-system-riscv64</emulator>
+    <disk type='file'>
+      <driver name='qemu' type='qcow2'/>
+      <source file='/var/lib/libvirt/images/riscv64.qcow2'/>
+      <target dev='vda' bus='virtio'/>
+      <!-- We need to manually pick an address on pcie.0 because otherwise
+           libvirt would try to add pcie-root-ports, and QEMU doesn't support
+           PCIe controllers for RISC-V guests yet -->
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+    </disk>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -3072,6 +3072,8 @@ mymain(void)
 
     DO_TEST("riscv64-virt",
             QEMU_CAPS_DEVICE_VIRTIO_MMIO);
+    DO_TEST("riscv64-virt-pci",
+            QEMU_CAPS_OBJECT_GPEX);
 
     /* Simple headless guests for various architectures */
     DO_TEST_CAPS_ARCH_LATEST("aarch64-virt-headless", "aarch64");

tests/qemuxml2xmloutdata/riscv64-virt-pci.xml

+<domain type='qemu'>
+  <name>riscv64</name>
+  <uuid>fd65fc03-8838-4c4d-9d8d-395802488790</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='riscv64' machine='virt'>hvm</type>
+    <kernel>/var/lib/libvirt/images/riscv64.bbl</kernel>
+    <cmdline>root=/dev/vda</cmdline>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-riscv64</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2'/>
+      <source file='/var/lib/libvirt/images/riscv64.qcow2'/>
+      <target dev='vda' bus='virtio'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+    </disk>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -1267,6 +1267,8 @@ mymain(void)
 
     DO_TEST("riscv64-virt",
             QEMU_CAPS_DEVICE_VIRTIO_MMIO);
+    DO_TEST("riscv64-virt-pci",
+            QEMU_CAPS_OBJECT_GPEX);
 
     if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
         virFileDeleteTree(fakerootdir);