powerpc/pseries: Fix KVM guest detection for disabling hardlockup detector

commit 44e5d21e6d upstream.

As per the kernel documentation[1], hardlockup detector should
be disabled in KVM guests as it may give false positives. On
PPC, hardlockup detector is enabled inside KVM guests because
disable_hardlockup_detector() is marked as early_initcall and it
relies on kvm_guest static key (is_kvm_guest()) which is initialized
later during boot by check_kvm_guest(), which is a core_initcall.
check_kvm_guest() is also called in pSeries_smp_probe(), which is called
before initcalls, but it is skipped if KVM guest does not have doorbell
support or if the guest is launched with SMT=1.

Call check_kvm_guest() in disable_hardlockup_detector() so that
is_kvm_guest() check goes through fine and hardlockup detector can be
disabled inside the KVM guest.

[1]: Documentation/admin-guide/sysctl/kernel.rst

Fixes: 633c8e9800 ("powerpc/pseries: Enable hardlockup watchdog for PowerVM partitions")
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241108094839.33084-1-gautam@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This commit is contained in:

Gautam Menghani

2024-11-08 15:18:37 +05:30

committed by

Greg Kroah-Hartman

parent d79f765b2e

commit 10c95568e7

1 changed files with 1 additions and 0 deletions

									
										arch/powerpc/kernel/setup_64.c
									
		+1
		
												View File
												
				@@ -924,6 +924,7 @@ static int __init disable_hardlockup_detector(void)

					hardlockup_detector_disable();

				#else

					if (firmware_has_feature(FW_FEATURE_LPAR)) {

						check_kvm_guest();

						if (is_kvm_guest())

							hardlockup_detector_disable();

					}