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qemu: Report all supported machine types in capabilities

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Some machine types are only reported as canonical names for other
machine types, which make it a bit harder to find what machine types are
supported by a specific QEMU binary. Ideally, one would just use
/capabilities/guest/arch[@name='...']/machine/text() XPath to get a list
of all supported machine types, but it doesn't work right now.

For example, we report

    <machine canonical='pc-i440fx-2.3' maxCpus='255'>pc</machine>

in guest capabilities, but the corresponding

    <machine maxCpus='255'>pc-i440fx-2.3</machine>

is missing.

This is a result of QMP probing. With "-machine ?" parsing QEMU sends
us two lines:

pc                   Standard PC (i440FX + PIIX, 1996) (alias of pc-i440fx-2.3)
pc-i440fx-2.3        Standard PC (i440FX + PIIX, 1996) (default)

while query-machines QMP command reports both in the same entry:

{"name": "pc-i440fx-2.3", "is-default": true, "cpu-max": 255, "alias": "pc"}

Let's make sure we always report separate <machine/> for both the
canonical name and its alias and using the canonical name as the default
machine type (i.e., inserting it before its alias) in case is-default is
true.

https://bugzilla.redhat.com/show_bug.cgi?id=1229666

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Jiri Denemark 2015-06-12 14:36:51 +02:00
parent 7690a5a838
commit beca509e43
1 changed files with 38 additions and 0 deletions
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38
src/qemu/qemu_capabilities.c
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@ -2229,6 +2229,44 @@ int virQEMUCapsGetMachineTypesCaps(virQEMUCapsPtr qemuCaps,
mach->maxCpus = qemuCaps->machineMaxCpus[i];
}
/* Make sure all canonical machine types also have their own entry so that
* /capabilities/guest/arch[@name='...']/machine/text() XPath selects all
* supported machine types.
*/
i = 0;
while (i < *nmachines) {
size_t j;
bool found = false;
virCapsGuestMachinePtr machine = (*machines)[i];
if (!machine->canonical) {
i++;
continue;
}
for (j = 0; j < *nmachines; j++) {
if (STREQ(machine->canonical, (*machines)[j]->name)) {
found = true;
break;
}
}
if (!found) {
virCapsGuestMachinePtr mach;
if (VIR_ALLOC(mach) < 0)
goto error;
if (VIR_INSERT_ELEMENT_COPY(*machines, i, *nmachines, mach) < 0) {
VIR_FREE(mach);
goto error;
}
if (VIR_STRDUP(mach->name, machine->canonical) < 0)
goto error;
mach->maxCpus = machine->maxCpus;
i++;
}
i++;
}
return 0;
error: