From: Oliver Upton <oupton@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Peter Shier <pshier@google.com>,
Shakeel Butt <shakeelb@google.com>,
Guangyu Shi <guangyus@google.com>,
Oliver Upton <oupton@google.com>,
Jing Zhang <jingzhangos@google.com>
Subject: [PATCH 1/3] KVM: arm64: Record number of signal exits as a vCPU stat
Date: Thu, 29 Jul 2021 19:56:30 +0000 [thread overview]
Message-ID: <20210729195632.489978-2-oupton@google.com> (raw)
In-Reply-To: <20210729195632.489978-1-oupton@google.com>
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.
Cc: Jing Zhang <jingzhangos@google.com>
Signed-off-by: Oliver Upton <oupton@google.com>
---
arch/arm64/include/asm/kvm_host.h | 1 +
arch/arm64/kvm/arm.c | 1 +
arch/arm64/kvm/guest.c | 3 ++-
3 files changed, 4 insertions(+), 1 deletion(-)
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..50fc16ad872f 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -50,7 +50,8 @@ 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, exits)
+ STATS_DESC_COUNTER(VCPU, exits),
+ STATS_DESC_COUNTER(VCPU, signal_exits),
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
--
2.32.0.554.ge1b32706d8-goog
next prev parent reply other threads:[~2021-07-29 19:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 19:56 [PATCH 0/3] KVM: arm64: Use generic guest entry infrastructure Oliver Upton
2021-07-29 19:56 ` Oliver Upton [this message]
2021-07-29 20:07 ` [PATCH 1/3] KVM: arm64: Record number of signal exits as a vCPU stat Jing Zhang
2021-07-29 20:23 ` Oliver Upton
2021-07-29 19:56 ` [PATCH 2/3] entry: KVM: Allow use of generic KVM entry w/o full generic support Oliver Upton
2021-07-29 19:56 ` [PATCH 3/3] KVM: arm64: Use generic KVM xfer to guest work function Oliver Upton
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