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Thu, 29 Jul 2021 15:09:26 -0700 (PDT) Date: Thu, 29 Jul 2021 22:09:14 +0000 In-Reply-To: <20210729220916.1672875-1-oupton@google.com> Message-Id: <20210729220916.1672875-2-oupton@google.com> Mime-Version: 1.0 References: <20210729220916.1672875-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.554.ge1b32706d8-goog Subject: [PATCH v2 1/3] KVM: arm64: Record number of signal exits as a vCPU stat From: Oliver Upton To: kvmarm@lists.cs.columbia.edu Cc: Shakeel Butt , kvm@vger.kernel.org, Peter Zijlstra , Marc Zyngier , Peter Shier , linux-kernel@vger.kernel.org, Guangyu Shi , Will Deacon , Andy Lutomirski , Catalin Marinas , Paolo Bonzini , Thomas Gleixner , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Most other architectures that implement KVM record a statistic indicating the number of times a vCPU has exited due to a pending signal. Add support for that stat to arm64. Reviewed-by: Jing Zhang Signed-off-by: Oliver Upton --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/arm.c | 1 + arch/arm64/kvm/guest.c | 1 + 3 files changed, 3 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 41911585ae0c..70e129f2b574 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -576,6 +576,7 @@ struct kvm_vcpu_stat { u64 wfi_exit_stat; u64 mmio_exit_user; u64 mmio_exit_kernel; + u64 signal_exits; u64 exits; }; diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index e9a2b8f27792..60d0a546d7fd 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -783,6 +783,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) if (signal_pending(current)) { ret = -EINTR; run->exit_reason = KVM_EXIT_INTR; + ++vcpu->stat.signal_exits; } /* diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 1dfb83578277..853d1e8d2e73 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -50,6 +50,7 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { STATS_DESC_COUNTER(VCPU, wfi_exit_stat), STATS_DESC_COUNTER(VCPU, mmio_exit_user), STATS_DESC_COUNTER(VCPU, mmio_exit_kernel), + STATS_DESC_COUNTER(VCPU, signal_exits), STATS_DESC_COUNTER(VCPU, exits) }; static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) == -- 2.32.0.554.ge1b32706d8-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm