Commit fe5161d2 authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
Browse files

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: default avatarJing Zhang <jingzhangos@google.com>
Signed-off-by: default avatarOliver Upton <oupton@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210802192809.1851010-2-oupton@google.com
parent c500bee1

arch/arm64/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

};

arch/arm64/kvm/arm.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

		}



		/*

arch/arm64/kvm/guest.c

+1 −0
Original line number Diff line number Diff line
@@ -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) ==