qemu_validate: Reject virtiofs with bootindex on s390x with CCW

The CCW variant of the 'vhost-user-fs' device in qemu doesn't
deliberately support the 'bootindex' attribute as the machine is unable
to boot from such device.

Reject '<boot order' on non-PCI virtiofs, add tests validating that it's
rejected as well as that virtiofs on PCI-based hosts but without address
specified will be accepted.

Resolves: https://issues.redhat.com/browse/RHEL-22728
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>

src/qemu/qemu_validate.c

@@ -4495,12 +4495,21 @@ qemuValidateDomainDeviceDefFS(virDomainFSDef *fs,
         if (qemuValidateDomainDefVhostUserRequireSharedMemory(def, "virtiofs") < 0) {
             return -1;
         }
-        if (fs->info.bootIndex &&
-            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VHOST_USER_FS_BOOTINDEX)) {
+
+        if (fs->info.bootIndex) {
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VHOST_USER_FS_BOOTINDEX)) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("setting virtiofs boot order is not supported with this QEMU binary"));
                 return -1;
             }
+
+            if (fs->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("setting virtiofs boot order is supported only with PCI bus"));
+                return -1;
+            }
+        }
+
         break;
 
     case VIR_DOMAIN_FS_DRIVER_TYPE_MTP:

tests/qemuxmlconfdata/vhost-user-fs-ccw-bootindex.s390x-latest.err

@@ -0,0 +1 @@
+unsupported configuration: setting virtiofs boot order is supported only with PCI bus

tests/qemuxmlconfdata/vhost-user-fs-ccw-bootindex.xml

@@ -0,0 +1,38 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <memoryBacking>
+    <access mode='shared'/>
+  </memoryBacking>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </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-s390x</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='virtio'/>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
+    </disk>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </memballoon>
+    <panic model='s390'/>
+    <filesystem type="mount" accessmode="passthrough">
+      <target dir="mount_tag"/>
+      <source dir="/tmp"/>
+      <binary path="/usr/libexec/virtiofsd"/>
+      <boot order="2"/>
+      <driver type="virtiofs" />
+    </filesystem>
+  </devices>
+</domain>

tests/qemuxmlconfdata/vhost-user-fs-hugepages.x86_64-latest.args

@@ -36,6 +36,8 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
 -device '{"driver":"virtio-blk-pci","bus":"pci.4","addr":"0x0","drive":"libvirt-1-format","id":"virtio-disk0","bootindex":1}' \
 -chardev socket,id=chr-vu-fs0,path=/var/lib/libvirt/qemu/domain--1-guest/fs0-fs.sock \
 -device '{"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-fs0","tag":"mount_tag","bootindex":2,"bus":"pci.1","addr":"0x0"}' \
+-chardev socket,id=chr-vu-fs1,path=/var/lib/libvirt/qemu/domain--1-guest/fs1-fs.sock \
+-device '{"driver":"vhost-user-fs-pci","id":"fs1","chardev":"chr-vu-fs1","tag":"mount_tag2","bootindex":3,"bus":"pci.2","addr":"0x0"}' \
 -audiodev '{"id":"audio1","driver":"none"}' \
 -global ICH9-LPC.noreboot=off \
 -watchdog-action reset \

tests/qemuxmlconfdata/vhost-user-fs-hugepages.x86_64-latest.xml

@@ -69,6 +69,14 @@
       <boot order='2'/>
       <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
     </filesystem>
+    <filesystem type='mount' accessmode='passthrough'>
+      <driver type='virtiofs'/>
+      <binary path='/usr/libexec/virtiofsd'/>
+      <source dir='/path'/>
+      <target dir='mount_tag2'/>
+      <boot order='3'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
+    </filesystem>
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <audio id='1' type='none'/>

tests/qemuxmlconfdata/vhost-user-fs-hugepages.xml

@@ -69,6 +69,14 @@
       <boot order='2'/>
       <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
     </filesystem>
+    <!-- following virtiofs is deliberately without address to prove bootindex validation -->
+    <filesystem type='mount' accessmode='passthrough'>
+      <driver type='virtiofs'/>
+      <binary path='/usr/libexec/virtiofsd'/>
+      <source dir='/path'/>
+      <target dir='mount_tag2'/>
+      <boot order='3'/>
+    </filesystem>
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <audio id='1' type='none'/>

tests/qemuxmlconftest.c

@@ -2855,6 +2855,7 @@ mymain(void)
     DO_TEST_CAPS_LATEST_PARSE_ERROR("vhost-user-fs-readonly");
 
     DO_TEST_CAPS_ARCH_LATEST("vhost-user-fs-ccw", "s390x");
+    DO_TEST_CAPS_ARCH_LATEST_PARSE_ERROR("vhost-user-fs-ccw-bootindex", "s390x");
 
     DO_TEST_CAPS_LATEST("virtio-transitional");
     DO_TEST_CAPS_LATEST("virtio-non-transitional");