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

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BugLink: https://bugs.launchpad.net/bugs/2077600

[ 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>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Atish Patra
2024-04-20 08:17:26 -07:00
committed by Stefan Bader
parent 91a8401abb
commit cf3b431d20
1 changed files with 1 additions and 1 deletions
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arch/riscv/kvm/vcpu_pmu.c
+1 -1
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@@ -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;