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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Sep 2025 06:35:49.5834 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0314d65e-5834-498c-5d89-08ddeb7d49b1 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B06C.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8717 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1756967779383124100 Content-Type: text/plain; charset="utf-8" Even if Xen governor is not used in amd-cppc active mode, we could somehow deduce which performance policy (CPUFREQ_POLICY_xxx) user wants to apply through which governor they choose, such as: If user chooses performance governor, they want maximum performance, then the policy shall be CPUFREQ_POLICY_PERFORMANCE If user chooses powersave governor, they want the least power consumption, then the policy shall be CPUFREQ_POLICY_POWERSAVE Function cpufreq_policy_from_governor() is responsible for above transition, and it shall be also effective when users setting new governor through xenp= m. Userspace is a forbidden choice, and if users specify such option, we shall not only give warning message to suggest using "xenpm set-cpufreq-cppc", but also error out. Signed-off-by: Penny Zheng Acked-by: Jan Beulich --- v4 -> v5: - new commit --- v5 -> v6: - refactor warning message --- v6 -> v7: - move policy->policy set where it firstly gets introduced - refactor commit message --- v7 -> v8: - policy transition is only limited in CPPC mode --- xen/drivers/acpi/pm-op.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/xen/drivers/acpi/pm-op.c b/xen/drivers/acpi/pm-op.c index 2f516e62b1..a7eaf29c31 100644 --- a/xen/drivers/acpi/pm-op.c +++ b/xen/drivers/acpi/pm-op.c @@ -207,6 +207,17 @@ static int set_cpufreq_gov(struct xen_sysctl_pm_op *op) if ( new_policy.governor =3D=3D NULL ) return -EINVAL; =20 + if ( processor_pminfo[op->cpuid]->init & XEN_CPPC_INIT ) + { + new_policy.policy =3D cpufreq_policy_from_governor(new_policy.gove= rnor); + if ( new_policy.policy =3D=3D CPUFREQ_POLICY_UNKNOWN ) + { + printk("Failed to get performance policy from %s, Try \"xenpm = set-cpufreq-cppc\"\n", + new_policy.governor->name); + return -EINVAL; + } + } + return __cpufreq_set_policy(old_policy, &new_policy); } =20 --=20 2.34.1