On 03/15/2018 10:22 AM, Joao Martins wrote: > All uploaded PM data from non-dom0 CPUs takes the info from vCPU 0 and > changing only the acpi_id. For processors which P-state coordination type > is HW_ALL (0xFD) it is OK to upload bogus P-state dependency information > (_PSD), because Xen will ignore any cpufreq domains created for past CPUs. > > Albeit for platforms which expose coordination types as SW_ANY or SW_ALL, > this will have some unintended side effects. Effectively, it will look at > the P-state domain existence and *if it already exists* it will skip the > acpi-cpufreq initialization and thus inherit the policy from the first CPU > in the cpufreq domain. This will finally lead to the original cpu not > changing target freq to P0 other than the first in the domain. Which will > make turbo boost not getting enabled (e.g. for 'performance' governor) for > all cpus. > > This patch fixes that, by also evaluating _PSD when we enumerate all ACPI > processors and thus always uploading the correct info to Xen. We export > acpi_processor_get_psd() for that this purpose, but change signature > to not assume an existent of acpi_processor given that ACPI isn't creating > an acpi_processor for non-dom0 CPUs. > > Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
