xen/ACPI: don't upload Px/Cx data for disabled processors
authorJan Beulich <JBeulich@suse.com>
Mon, 25 Jun 2018 10:17:35 +0000 (04:17 -0600)
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>
Mon, 20 Aug 2018 18:46:18 +0000 (14:46 -0400)
commit166deb0f0bcdda70cfa650982777f94da273f0e4
tree81636c57351579b539e053c5b1296f105b08e267
parent71dc05635983ae711694f748d006e107387f1bab
xen/ACPI: don't upload Px/Cx data for disabled processors

This is unnecessary and triggers a warning in the hypervisor.

Often systems have more processor entries in their ACPI tables than are
actually installed/active. The ACPI_STA_DEVICE_PRESENT bit cannot be
reliably used, but the ACPI_MADT_ENABLED bit can. In order to not
introduce new functions in the main ACPI processor driver code, simply
use acpi_get_phys_id(), which does more than we need, but which checks
the MADT enabled bit in the process. Any CPU for which we can't
determine the APIC ID is unlikely to work properly anyway, so the extra
checks done by acpi_get_phys_id() should do no harm.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
drivers/acpi/processor_core.c
drivers/xen/xen-acpi-processor.c