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Roger Pau Monne bfa993b355 acpi/processor: sanitize _OSC/_PDC capabilities for Xen dom0 
The Processor capability bits notify ACPI of the OS capabilities, and
so ACPI can adjust the return of other Processor methods taking the OS
capabilities into account.

When Linux is running as a Xen dom0, the hypervisor is the entity
in charge of processor power management, and hence Xen needs to make
sure the capabilities reported by _OSC/_PDC match the capabilities of
the driver in Xen.

Introduce a small helper to sanitize the buffer when running as Xen
dom0.

When Xen supports HWP, this serves as the equivalent of commit
a21211672c ("ACPI / processor: Request native thermal interrupt
handling via _OSC") to avoid SMM crashes.  Xen will set bit
ACPI_PROC_CAP_COLLAB_PROC_PERF (bit 12) in the capability bits and the
_OSC/_PDC call will apply it.

[ jandryuk: Mention Xen HWP's need.  Support _OSC & _PDC ]
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20231108212517.72279-1-jandryuk@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
2023-11-13 07:22:00 +01:00
..
alpha TTY/Serial changes for 6.7-rc1 2023-11-03 15:44:25 -10:00
arc kprobes: unify kprobes_exceptions_nofify() prototypes 2023-11-10 19:59:05 +09:00
arm Probes fixes for v6.7-rc1: 2023-11-10 16:35:04 -08:00
arm64 Probes fixes for v6.7-rc1: 2023-11-10 16:35:04 -08:00
csky Kbuild updates for v6.7 2023-11-04 08:07:19 -10:00
hexagon TTY/Serial changes for 6.7-rc1 2023-11-03 15:44:25 -10:00
loongarch LoongArch changes for v6.7 2023-11-12 10:58:08 -08:00
m68k Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
microblaze asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
mips Probes fixes for v6.7-rc1: 2023-11-10 16:35:04 -08:00
nios2 vgacon, arch/*: remove unused screen_info definitions 2023-10-17 10:17:02 +02:00
openrisc OpenRISC updates for 6.6 2023-09-05 10:09:31 -07:00
parisc parisc: Prevent booting 64-bit kernels on PA1.x machines 2023-11-10 16:17:32 +01:00
powerpc powerpc fixes for 6.7 #2 2023-11-12 10:50:38 -08:00
riscv RISC-V Patches for the 6.7 Merge Window, Part 2 2023-11-10 09:23:17 -08:00
s390 kprobes: unify kprobes_exceptions_nofify() prototypes 2023-11-10 19:59:05 +09:00
sh kprobes: unify kprobes_exceptions_nofify() prototypes 2023-11-10 19:59:05 +09:00
sparc kprobes: unify kprobes_exceptions_nofify() prototypes 2023-11-10 19:59:05 +09:00
um um,ethertap: Replace deprecated strncpy() with strscpy() 2023-09-29 11:37:50 -07:00
x86 acpi/processor: sanitize _OSC/_PDC capabilities for Xen dom0 2023-11-13 07:22:00 +01:00
xtensa TTY/Serial changes for 6.7-rc1 2023-11-03 15:44:25 -10:00
.gitignore
Kconfig arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00