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KVM: arm64: Record number of signal exits as a vCPU stat 

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 <jingzhangos@google.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210802192809.1851010-2-oupton@google.com
This commit is contained in:
Oliver Upton 2021-08-02 19:28:07 +00:00 committed by Marc Zyngier
parent c500bee1c5
commit fe5161d2c3
3 changed files with 3 additions and 0 deletions
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1
arch/arm64/include/asm/kvm_host.h
View File

@ -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;
};

1
arch/arm64/kvm/arm.c
View File

@ -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;
}
/*

1
arch/arm64/kvm/guest.c
View File

@ -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) ==