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Fri, 19 Apr 2024 16:48:03 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id w17-20020a170902d11100b001e42f215f33sm3924017plw.85.2024.04.19.16.48.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Apr 2024 16:48:02 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Andrew Jones , Ajay Kaher , Albert Ou , Alexandre Ghiti , Anup Patel , samuel.holland@sifive.com, Conor Dooley , Juergen Gross , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Rutland , Palmer Dabbelt , Paolo Bonzini , Paul Walmsley , Shuah Khan , virtualization@lists.linux.dev, Will Deacon , x86@kernel.org Subject: [PATCH v8 10/24] RISC-V: KVM: Fix the initial sample period value Date: Sat, 20 Apr 2024 08:17:26 -0700 Message-Id: <20240420151741.962500-11-atishp@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240420151741.962500-1-atishp@rivosinc.com> References: <20240420151741.962500-1-atishp@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Atish Patra Reviewed-by: Anup Patel --- 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 86391a5061dd..cee1b9ca4ec4 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; =20 if (!pmc->counter_val) - sample_period =3D counter_val_mask + 1; + sample_period =3D counter_val_mask; else sample_period =3D (-pmc->counter_val) & counter_val_mask; =20 --=20 2.34.1