Commit bbb62248 authored by Atish Patra's avatar Atish Patra Committed by Anup Patel
Browse files

RISC-V: KVM: Disable the kernel perf counter during configure 



The perf event should be marked disabled during the creation as
it is not ready to be scheduled until there is SBI PMU start call
or config matching is called with auto start. Otherwise, event add/start
gets called during perf_event_create_kernel_counter function.
It will be enabled and scheduled to run via perf_event_enable during
either the above mentioned scenario.

Fixes: 0cb74b65 ("RISC-V: KVM: Implement perf support without sampling")

Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Signed-off-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250303-kvm_pmu_improve-v2-1-41d177e45929@rivosinc.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 7eb17214

arch/riscv/kvm/vcpu_pmu.c

+1 −0
Original line number Diff line number Diff line
@@ -666,6 +666,7 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba 
		.type = etype,

		.size = sizeof(struct perf_event_attr),

		.pinned = true,

		.disabled = true,

		/*

		 * It should never reach here if the platform doesn't support the sscofpmf

		 * extension as mode filtering won't work without it.