Re: [PATCH v2] platform/x86/intel: power-domains: Use topology_logical_package_id() for package ID

[srinivas pandruvada <srinivas.pandruvada@linux.intel.com>]

On Fri, 2025-08-29 at 07:38 -0400, David Arcari wrote:
> Currently, tpmi_get_logical_id() calls topology_physical_package_id()
> to set the pkg_id of the info structure. Since some VM hosts assign
> non
> contiguous package IDs, topology_physical_package_id() can return a
> larger value than topology_max_packages(). This will result in an
> invalid reference into tpmi_power_domain_mask[] as that is allocatead
> based on topology_max_packages() as the maximum package ID.
> 
> Fixes: 17ca2780458c ("platform/x86/intel: TPMI domain id and CPU
> mapping")
> Signed-off-by: David Arcari <darcari@redhat.com>
    Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

> ---
> v2: fixed underlying issue in tpmi_get_logcal_id() instead of
>     preventing access in tpmi_cpu_online().
> 
> Cc: Hans de Goede <hansg@kernel.org>
> Cc: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Dan Carpenter <dan.carpenter@linaro.org>
> Cc: David Arcari <darcari@redhat.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Tero Kristo <tero.kristo@linux.intel.com>
> Cc: linux-kernel@vger.kernel.org
>  drivers/platform/x86/intel/tpmi_power_domains.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/tpmi_power_domains.c
> b/drivers/platform/x86/intel/tpmi_power_domains.c
> index 9d8247bb9cfa..8641353b2e06 100644
> --- a/drivers/platform/x86/intel/tpmi_power_domains.c
> +++ b/drivers/platform/x86/intel/tpmi_power_domains.c
> @@ -178,7 +178,7 @@ static int tpmi_get_logical_id(unsigned int cpu,
> struct tpmi_cpu_info *info)
>  
>  	info->punit_thread_id = FIELD_GET(LP_ID_MASK, data);
>  	info->punit_core_id = FIELD_GET(MODULE_ID_MASK, data);
> -	info->pkg_id = topology_physical_package_id(cpu);
> +	info->pkg_id = topology_logical_package_id(cpu);
>  	info->linux_cpu = cpu;
>  
>  	return 0;