6.9-stable review patch. If anyone has any objections, please let me know.
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From: Atish Patra atishp@rivosinc.com
[ Upstream commit 57990ab90ce31aadac0d5a6293f5582e24ff7521 ]
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: Andrew Jones ajones@ventanamicro.com Signed-off-by: Atish Patra atishp@rivosinc.com Reviewed-by: Anup Patel anup@brainfault.org Link: https://lore.kernel.org/r/20240420151741.962500-11-atishp@rivosinc.com Signed-off-by: Anup Patel anup@brainfault.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kvm/vcpu_pmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c index 86391a5061dda..cee1b9ca4ec48 100644 --- a/arch/riscv/kvm/vcpu_pmu.c +++ b/arch/riscv/kvm/vcpu_pmu.c @@ -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;