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hw/core/machine-smp: Deprecate unsupported "parameter=1" SMP configurations

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Currently, it was allowed for users to specify the unsupported
topology parameter as "1". For example, x86 PC machine doesn't
support drawer/book/cluster topology levels, but user could specify
"-smp drawers=1,books=1,clusters=1".

This is meaningless and confusing, so that the support for this kind of
configurations is marked deprecated since 9.0. And report warning
message for such case like:

qemu-system-x86_64: warning: Deprecated CPU topology (considered invalid):
                    Unsupported clusters parameter mustn't be specified as 1
qemu-system-x86_64: warning: Deprecated CPU topology (considered invalid):
                    Unsupported books parameter mustn't be specified as 1
qemu-system-x86_64: warning: Deprecated CPU topology (considered invalid):
                    Unsupported drawers parameter mustn't be specified as 1

Users have to ensure that all the topology members described with -smp
are supported by the target machine.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240308160148.3130837-3-zhao1.liu@linux.intel.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Zhao Liu 2024-03-09 00:01:37 +08:00 • committed by Philippe Mathieu-Daudé
parent 72d346f3b8
commit 54c4ea8f3a
2 changed files with 62 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

65
hw/core/machine-smp.c
View file

@ -112,30 +112,61 @@ void machine_parse_smp_config(MachineState *ms,
/*
* If not supported by the machine, a topology parameter must be
* omitted or specified equal to 1.
* omitted.
*/
if (!mc->smp_props.dies_supported && dies > 1) {
error_setg(errp, "dies not supported by this machine's CPU topology");
return;
if (!mc->smp_props.clusters_supported && config->has_clusters) {
if (config->clusters > 1) {
error_setg(errp, "clusters not supported by this "
"machine's CPU topology");
return;
} else {
/* Here clusters only equals 1 since we've checked zero case. */
warn_report("Deprecated CPU topology (considered invalid): "
"Unsupported clusters parameter mustn't be "
"specified as 1");
}
}
if (!mc->smp_props.clusters_supported && clusters > 1) {
error_setg(errp, "clusters not supported by this machine's CPU topology");
return;
}
dies = dies > 0 ? dies : 1;
clusters = clusters > 0 ? clusters : 1;
if (!mc->smp_props.books_supported && books > 1) {
error_setg(errp, "books not supported by this machine's CPU topology");
return;
if (!mc->smp_props.dies_supported && config->has_dies) {
if (config->dies > 1) {
error_setg(errp, "dies not supported by this "
"machine's CPU topology");
return;
} else {
/* Here dies only equals 1 since we've checked zero case. */
warn_report("Deprecated CPU topology (considered invalid): "
"Unsupported dies parameter mustn't be "
"specified as 1");
}
}
dies = dies > 0 ? dies : 1;
if (!mc->smp_props.books_supported && config->has_books) {
if (config->books > 1) {
error_setg(errp, "books not supported by this "
"machine's CPU topology");
return;
} else {
/* Here books only equals 1 since we've checked zero case. */
warn_report("Deprecated CPU topology (considered invalid): "
"Unsupported books parameter mustn't be "
"specified as 1");
}
}
books = books > 0 ? books : 1;
if (!mc->smp_props.drawers_supported && drawers > 1) {
error_setg(errp,
"drawers not supported by this machine's CPU topology");
return;
if (!mc->smp_props.drawers_supported && config->has_drawers) {
if (config->drawers > 1) {
error_setg(errp, "drawers not supported by this "
"machine's CPU topology");
return;
} else {
/* Here drawers only equals 1 since we've checked zero case. */
warn_report("Deprecated CPU topology (considered invalid): "
"Unsupported drawers parameter mustn't be "
"specified as 1");
}
}
drawers = drawers > 0 ? drawers : 1;