Re: [PATCH 1/3] KVM: arm64: Record number of signal exits as a vCPU stat

2021-07-29 Thread Oliver Upton 
On Thu, Jul 29, 2021 at 1:07 PM Jing Zhang  wrote:
>
> On Thu, Jul 29, 2021 at 12:56 PM Oliver Upton  wrote:
> >
> > 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 
> > Signed-off-by: Oliver Upton 
> > ---
> >  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),
> How about put signal_exits before exits as the same order in
> kvm_vcpu_stat just for readability?

Definitely.

> >  };
> >  static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
> > sizeof(struct kvm_vcpu_stat) / sizeof(u64));
> > --
> > 2.32.0.554.ge1b32706d8-goog
> >
> Reviewed-by: Jing Zhang 

Thanks Jing!
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Re: [PATCH 1/3] KVM: arm64: Record number of signal exits as a vCPU stat

2021-07-29 Thread Jing Zhang 
On Thu, Jul 29, 2021 at 12:56 PM Oliver Upton  wrote:
>
> 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 
> Signed-off-by: Oliver Upton 
> ---
>  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),
How about put signal_exits before exits as the same order in
kvm_vcpu_stat just for readability?
>  };
>  static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
> sizeof(struct kvm_vcpu_stat) / sizeof(u64));
> --
> 2.32.0.554.ge1b32706d8-goog
>
Reviewed-by: Jing Zhang 

Thanks,
Jing
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[PATCH 1/3] KVM: arm64: Record number of signal exits as a vCPU stat

2021-07-29 Thread Oliver Upton 
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 
Signed-off-by: Oliver Upton 
---
 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

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