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virsh: Warn when hypervisor-cpu-* is used with host CPU

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While using host CPU definition from capabilities XML is allowed for
historical reasons, it will likely provide incorrect results and should
be avoided.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jiri Denemark 2025-02-20 13:30:36 +01:00
parent 71fe4b97a9
commit 2fb76aeae6
1 changed files with 13 additions and 5 deletions
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18
tools/virsh-host.c
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@ -1093,7 +1093,8 @@ cmdURI(vshControl *ctl, const vshCmd *cmd G_GNUC_UNUSED)
*/
static char **
vshExtractCPUDefXMLs(vshControl *ctl,
const char *xmlFile)
const char *xmlFile,
bool hostCPUWarning)
{
g_auto(GStrv) cpus = NULL;
g_autofree char *buffer = NULL;
@ -1137,6 +1138,8 @@ vshExtractCPUDefXMLs(vshControl *ctl,
cpus = g_new0(char *, n + 1);
for (i = 0; i < n; i++) {
ctxt->node = nodes[i];
/* If the user provided domain capabilities XML, we need to replace
* <mode ...> element with <cpu>. */
if (xmlStrEqual(nodes[i]->name, BAD_CAST "mode")) {
@ -1150,6 +1153,11 @@ vshExtractCPUDefXMLs(vshControl *ctl,
}
}
if (hostCPUWarning &&
virXPathBoolean("boolean(./feature[not(@policy)])", ctxt) == 1) {
vshWarn(ctl, "%s", _("using host CPU definition as input may provide incorrect results"));
}
if (!(cpus[i] = virXMLNodeToString(xml, nodes[i]))) {
vshSaveLibvirtError();
return NULL;
@ -1199,7 +1207,7 @@ cmdCPUCompare(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptString(ctl, cmd, "file", &from) < 0)
return false;
if (!(cpus = vshExtractCPUDefXMLs(ctl, from)))
if (!(cpus = vshExtractCPUDefXMLs(ctl, from, false)))
return false;
result = virConnectCompareCPU(priv->conn, cpus[0], flags);
@ -1268,7 +1276,7 @@ cmdCPUBaseline(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptString(ctl, cmd, "file", &from) < 0)
return false;
if (!(list = vshExtractCPUDefXMLs(ctl, from)))
if (!(list = vshExtractCPUDefXMLs(ctl, from, false)))
return false;
if (!(result = virConnectBaselineCPU(priv->conn, (const char **)list,
@ -1612,7 +1620,7 @@ cmdHypervisorCPUCompare(vshControl *ctl,
vshCommandOptString(ctl, cmd, "machine", &machine) < 0)
return false;
if (!(cpus = vshExtractCPUDefXMLs(ctl, from)))
if (!(cpus = vshExtractCPUDefXMLs(ctl, from, true)))
return false;
result = virConnectCompareHypervisorCPU(priv->conn, emulator, arch,
@ -1736,7 +1744,7 @@ cmdHypervisorCPUBaseline(vshControl *ctl,
VSH_ALTERNATIVE_OPTIONS_EXPR("file", from, "model", model);
if (from) {
if (!(list = vshExtractCPUDefXMLs(ctl, from)))
if (!(list = vshExtractCPUDefXMLs(ctl, from, true)))
return false;
} else {
list = g_new0(char *, 2);