qemuxml2argvtest: Modernize 'cpu-(no)fallback' test

Previously without modern capabilities the test was relying on a CPU
model which was not entered into a fake list of supported cpus.

With real capabilities we have to pick a CPU model which is supported by
libvirt but in some version is not supported by qemu. I've picked
EPYC-Milan, which was introduced into qemu-6.0.

This test configures a CPU which is equivalent to EPYC-Rome by disabling
features from EPYC-Milan and uses a versioned real caps test to check it
against a qemu which doesn't support EPYC-Milan.

With real capabilities though, we can also do a positive test case by
using a version whic doesh support it. I've specifically not used the
LATEST caps so that it doesn't change once capabilities are bumped.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

tests/qemuxml2argvdata/cpu-fallback.x86_64-5.2.0.args

@@ -0,0 +1,34 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes \
+-machine pc-i440fx-5.2,usb=off,dump-guest-core=off,memory-backend=pc.ram \
+-accel kvm \
+-cpu EPYC-Rome,amd-ssbd=off,erms=off,fsrm=off,invpcid=off,pcid=off,pku=off,xsaves=off \
+-m size=219136k \
+-object memory-backend-ram,id=pc.ram,size=224395264 \
+-overcommit mem-lock=off \
+-smp 6,sockets=6,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvdata/cpu-fallback.x86_64-8.0.0.args

@@ -10,9 +10,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
 -name guest=QEMUGuest1,debug-threads=on \
 -S \
 -object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
--machine pc,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=off \
+-machine pc-i440fx-8.0,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=off \
 -accel kvm \
--cpu Conroe,cx16=on,sse4.1=off,sse4.2=off,popcnt=off,aes=off \
+-cpu EPYC-Milan,amd-ssbd=off,erms=off,fsrm=off,ibrs=off,invpcid=off,pcid=off,pku=off,svme-addr-chk=off,xsaves=off \
 -m size=219136k \
 -object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":224395264}' \
 -overcommit mem-lock=off \

tests/qemuxml2argvdata/cpu-fallback.xml

@@ -9,11 +9,16 @@
     <boot dev='network'/>
   </os>
   <cpu match='exact'>
-    <model>Westmere</model>
-    <feature policy='disable' name='sse4.1'/>
-    <feature policy='disable' name='sse4.2'/>
-    <feature policy='disable' name='popcnt'/>
-    <feature policy='disable' name='aes'/>
+    <model>EPYC-Milan</model>
+    <feature policy='disable' name='amd-ssbd'/>
+    <feature policy='disable' name='erms'/>
+    <feature policy='disable' name='fsrm'/>
+    <feature policy='disable' name='ibrs'/>
+    <feature policy='disable' name='invpcid'/>
+    <feature policy='disable' name='pcid'/>
+    <feature policy='disable' name='pku'/>
+    <feature policy='disable' name='svme-addr-chk'/>
+    <feature policy='disable' name='xsaves'/>
   </cpu>
   <clock offset='utc'/>
   <on_poweroff>destroy</on_poweroff>

tests/qemuxml2argvdata/cpu-nofallback.err

@@ -1 +0,0 @@
-unsupported configuration: CPU model Westmere is not supported by hypervisor

tests/qemuxml2argvdata/cpu-nofallback.x86_64-5.2.0.err

@@ -0,0 +1 @@
+unsupported configuration: CPU model EPYC-Milan is not supported by hypervisor

tests/qemuxml2argvdata/cpu-nofallback.x86_64-8.0.0.args

@@ -0,0 +1,33 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine pc-i440fx-8.0,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=off \
+-accel kvm \
+-cpu EPYC-Milan,amd-ssbd=off,erms=off,fsrm=off,ibrs=off,invpcid=off,pcid=off,pku=off,svme-addr-chk=off,xsaves=off \
+-m size=219136k \
+-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":224395264}' \
+-overcommit mem-lock=off \
+-smp 6,sockets=6,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.0","addr":"0x2"}' \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvdata/cpu-nofallback.xml

@@ -9,11 +9,16 @@
     <boot dev='network'/>
   </os>
   <cpu match='exact'>
-    <model fallback='forbid'>Westmere</model>
-    <feature policy='disable' name='sse4.1'/>
-    <feature policy='disable' name='sse4.2'/>
-    <feature policy='disable' name='popcnt'/>
-    <feature policy='disable' name='aes'/>
+    <model fallback='forbid'>EPYC-Milan</model>
+    <feature policy='disable' name='amd-ssbd'/>
+    <feature policy='disable' name='erms'/>
+    <feature policy='disable' name='fsrm'/>
+    <feature policy='disable' name='ibrs'/>
+    <feature policy='disable' name='invpcid'/>
+    <feature policy='disable' name='pcid'/>
+    <feature policy='disable' name='pku'/>
+    <feature policy='disable' name='svme-addr-chk'/>
+    <feature policy='disable' name='xsaves'/>
   </cpu>
   <clock offset='utc'/>
   <on_poweroff>destroy</on_poweroff>

tests/qemuxml2argvtest.c

@@ -1742,10 +1742,15 @@ mymain(void)
     DO_TEST("cpu-exact1", QEMU_CAPS_KVM);
     DO_TEST("cpu-exact2", QEMU_CAPS_KVM);
     DO_TEST("cpu-exact2-nofallback", QEMU_CAPS_KVM);
-    DO_TEST("cpu-fallback", QEMU_CAPS_KVM);
-    DO_TEST_FAILURE("cpu-nofallback", QEMU_CAPS_KVM);
     DO_TEST_CAPS_ARCH_LATEST_FULL("cpu-strict1", "x86_64", ARG_CAPS_HOST_CPU_MODEL, QEMU_CPU_DEF_HASWELL);
     DO_TEST("cpu-no-removed-features", QEMU_CAPS_KVM);
+
+    /* EPYC-Milan became available in qemu-6.0, use it for the fallback tests */
+    DO_TEST_CAPS_VER_FAILURE("cpu-nofallback", "5.2.0");
+    DO_TEST_CAPS_VER("cpu-nofallback", "8.0.0");
+    DO_TEST_CAPS_VER("cpu-fallback", "5.2.0");
+    DO_TEST_CAPS_VER("cpu-fallback", "8.0.0");
+
     DO_TEST_NOCAPS("cpu-numa1");
     DO_TEST_NOCAPS("cpu-numa2");
     DO_TEST_NOCAPS("cpu-numa-no-memory-element");