linux/include/kvm
Marc Zyngier e840f42a49 KVM: arm64: Fix PMU probe ordering
Russell reported that since 5.13, KVM's probing of the PMU has
started to fail on his HW. As it turns out, there is an implicit
ordering dependency between the architectural PMU probing code and
and KVM's own probing. If, due to probe ordering reasons, KVM probes
before the PMU driver, it will fail to detect the PMU and prevent it
from being advertised to guests as well as the VMM.

Obviously, this is one probing too many, and we should be able to
deal with any ordering.

Add a callback from the PMU code into KVM to advertise the registration
of a host CPU PMU, allowing for any probing order.

Fixes: 5421db1be3 ("KVM: arm64: Divorce the perf code from oprofile helpers")
Reported-by: "Russell King (Oracle)" <linux@armlinux.org.uk>
Tested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/YUYRKVflRtUytzy5@shell.armlinux.org.uk
Cc: stable@vger.kernel.org
2021-09-20 12:43:34 +01:00
..
arm_arch_timer.h KVM: arm64: timers: Move timer registers to the sys_regs file 2020-07-07 09:28:38 +01:00
arm_hypercalls.h KVM: arm/arm64: Factor out hypercall handling from PSCI code 2019-10-21 19:20:26 +01:00
arm_pmu.h KVM: arm64: Fix PMU probe ordering 2021-09-20 12:43:34 +01:00
arm_psci.h KVM: arm/arm64: Factor out hypercall handling from PSCI code 2019-10-21 19:20:26 +01:00
arm_vgic.h KVM: arm64: vgic: Implement SW-driven deactivation 2021-06-01 10:46:00 +01:00
iodev.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 342 2019-06-05 17:37:07 +02:00