s.xenproject.org
> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
> cmdline
>
> On 20.05.2025 10:28, Penny, Zheng wrote:
> > [Public]
> >
> >> -Original Message-
> >> From: Jan Beulich
> >> Sent: Monday, May
Julien Grall ; Roger
>> Pau
>> Monné ; Stefano Stabellini ;
>> xen-
>> de...@lists.xenproject.org
>> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
>> cmdline
>>
>> On 19.05.2025 10:36, Penny, Zheng wrote:
>>> [Pub
s.xenproject.org
> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
> cmdline
>
> On 19.05.2025 10:36, Penny, Zheng wrote:
> > [Public]
> >
> >> -Original Message-
> >> From: Jan Beulich
> >> Sent:
Julien Grall ; Roger
>> Pau
>> Monné ; Stefano Stabellini ;
>> xen-
>> de...@lists.xenproject.org
>> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
>> cmdline
>>
>> On 14.04.2025 09:40, Penny Zheng wrote:
>>> -
s.xenproject.org
> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
> cmdline
>
> On 14.04.2025 09:40, Penny Zheng wrote:
> > --- a/xen/include/acpi/cpufreq/processor_perf.h
> > +++ b/xen/include/acpi/cpufreq/processor_perf.h
> >
On 07.05.2025 07:27, Penny, Zheng wrote:
>> -Original Message-
>> From: Jan Beulich
>> Sent: Tuesday, April 29, 2025 8:52 PM
>>
>> On 14.04.2025 09:40, Penny Zheng wrote:
>>> @@ -573,6 +576,14 @@ ret_t do_platform_op(
>>> }
>>>
>>> case XEN_PM_CPPC:
>>> +if (
ts.xenproject.org
> Subject: Re: [PATCH v4 05/15] xen/x86: introduce "cpufreq=amd-cppc" xen
> cmdline
>
> On 14.04.2025 09:40, Penny Zheng wrote:
> > @@ -514,5 +515,16 @@ acpi_cpufreq_driver = {
> >
> > int __init acpi_cpufreq_register(void) {
> > -
On 14.04.2025 09:40, Penny Zheng wrote:
> @@ -514,5 +515,16 @@ acpi_cpufreq_driver = {
>
> int __init acpi_cpufreq_register(void)
> {
> -return cpufreq_register_driver(&acpi_cpufreq_driver);
> +int ret;
> +
> +ret = cpufreq_register_driver(&acpi_cpufreq_driver);
> +if ( ret )
>
Users need to set "cpufreq=amd-cppc" in xen cmdline to enable
amd-cppc driver, which selects ACPI Collaborative Performance
and Power Control (CPPC) on supported AMD hardware to provide a
finer grained frequency control mechanism.
`verbose` option can also be included to support verbose print.
Whe
