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libvirt/tests/qemuxmlconfdata/schema-reorder-domain-subelements.x86_64-latest.xml

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schema: fix <interleave> errors when validating <domain> subelements I first noticed a problem when I added a <memoryBacking> element at an unusual (but still correct) place in the domain XML, and validation failed. Then I tried adding that element in several different places and it failed in many, but not all of them. (NB: from here on, I will use '' for the names of attributes in the domain XML, <> for elements in the domain XML, and "" for the names of grammar rule definitions in the RNG file, and "<>" for the names of elements in the RNG file's own XML. Confused yet? If so, please tell me a better way - everything I know about RNG I've picked up informally by looking at examples in already existing RNG files) Starting from the top level of the grammar for <domain> ("domaincontents" in domaincommon.rng), I noticed that 1) the "<attribute>" for the 'id' attribute of <domain> is defined inside an "<interleave>" down in the definition of "ids" (which is referenced from "domaincontents") (I'm not familiar with the nomenclature - does that make it a "sub-grammer", "child-grammar", ???) 2) although the definition of "ids", had all of its "<attribute>"s/"<element>"s inside an "<interleave>", "domaincontents" already had the reference to "ids" inside an "<interleave>", so there were nested "<interleave>"s. It's not clear to me how an "<attribute>" or "<interleave>" inside another "<interleave>" is supposed to behave, but they both seemed a bit suspicious. I tried all of the below modifications: 1) moving the grammar for the 'id' attribute out of the "<interleave>" but still inside "ids" 2) moving the grammer for the 'id' attribute directly into "domaincontents" (and outside of its "interleave" 3) removing the "<interleave>" that was inside "ids" 4) (2) + (3) 5) move the entire grammar rule "ids" up directly in place of <ref name="ids"> in "domaincontents". 6) (5), but with the grammar for the 'id' attribute moved outside of the "<interleave>" (6) was the only change that allowed all of the following (using modifications to the subelements of <domain> in net-vhostuser-passt.xml as example): a) a <memoryBacking> element in between *any* two existing elements b) moving <name> in between any two elements c) oddly, in addition to the problem with putting <memoryBacking> in odd places, I also found that the original RNG did not allow the <clock> element to be placed in between <on_poweroff> and <on_reboot>, but once I'd made the change in (6), this was no longer problematic. Why should this have any effect? No idea, but it works :-/ (NB: there are many other cases of referencing "sub-grammar" from inside an "<interleave>", and they all seem to work just fine; possibly in this case it was problematic because the sub-grammar a) also contained an "<interleave>", b) had an "<attribute>" at its toplevel, or c) had multiple "<element>"s.) (inexplicably (to me) at one point during my experimentation, I tried reordering the references to "clock", "resources", "features", and "events", and that *also* made it legal to put a <clock> element in between the <on_*> elements:-O) Since I was no longer able to reproduce the error described in (c) once I had made mod (6) (move all of "ids" directly into "domaincontent", I decided it was pointless for me to spend any more time randomly poking and just add that to the new test case for that in case some other random change to the RNG causes it to start failing again. (I thought of writing a test program that would try all possible orderings of the subelements of <domain>, but since doing that for even 10 subelements would mean testing > 3.2 million different XML documents, I decided we could continue in this adhoc manner, just adding a single new test case if/when a new validation failure is found.) Signed-off-by: Laine Stump <laine@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2025-02-20 20:13:06 -05:00
<domain type='kvm'>
<name>passtvhostuu</name>
<uuid>d79698e0-46b2-4459-87ee-7c762990dd6e</uuid>
<memory unit='KiB'>16777216</memory>
<currentMemory unit='KiB'>16777216</currentMemory>
<memoryBacking>
<access mode='shared'/>
</memoryBacking>
<vcpu placement='static'>16</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-7.2'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact' check='none'>
<model fallback='forbid'>qemu64</model>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/home/laine/libvirt/images/fedora-34.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0' multifunction='on'/>
</disk>
<controller type='pci' index='0' model='pci-root'/>
<controller type='usb' index='0' model='piix3-uhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<interface type='vhostuser'>
<mac address='52:54:00:21:de:6c'/>
<ip address='10.30.0.5' family='ipv4' prefix='24'/>
<model type='virtio'/>
<backend type='passt'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</interface>
<serial type='pty'>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</memballoon>
</devices>
</domain>
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