Commit 57990ab9 authored by Atish Patra's avatar Atish Patra Committed by Anup Patel
Browse files

RISC-V: KVM: Fix the initial sample period value 



The initial sample period value when counter value is not assigned
should be set to maximum value supported by the counter width.
Otherwise, it may result in spurious interrupts.

Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Signed-off-by: default avatarAtish Patra <atishp@rivosinc.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240420151741.962500-11-atishp@rivosinc.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent a8625217

arch/riscv/kvm/vcpu_pmu.c

+1 −1
Original line number Diff line number Diff line
@@ -39,7 +39,7 @@ static u64 kvm_pmu_get_sample_period(struct kvm_pmc *pmc) 
	u64 sample_period;



	if (!pmc->counter_val)

		sample_period = counter_val_mask + 1;

		sample_period = counter_val_mask;

	else

		sample_period = (-pmc->counter_val) & counter_val_mask;