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Commit 51d4e5da authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Thomas Gleixner
Browse files

x86/irq: Count Hyper-V reenlightenment interrupts 



Hyper-V reenlightenment interrupts arrive when the VM is migrated, While
they are not interesting in general it's important when L2 nested guests
are running.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: kvm@vger.kernel.org
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
Cc: Roman Kagan <rkagan@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: devel@linuxdriverproject.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Cathy Avery <cavery@redhat.com>
Cc: Mohammed Gamal <mmorsy@redhat.com>
Link: https://lkml.kernel.org/r/20180124132337.30138-6-vkuznets@redhat.com
parent e7c4e36c

arch/x86/hyperv/hv_init.c

+2 −0
Original line number Diff line number Diff line
@@ -147,6 +147,8 @@ __visible void __irq_entry hyperv_reenlightenment_intr(struct pt_regs *regs) 
{

	entering_ack_irq();



	inc_irq_stat(irq_hv_reenlightenment_count);



	schedule_delayed_work(&hv_reenlightenment_work, HZ/10);



	exiting_irq();

arch/x86/include/asm/hardirq.h

+3 −0
Original line number Diff line number Diff line
@@ -38,6 +38,9 @@ typedef struct { 
#if IS_ENABLED(CONFIG_HYPERV) || defined(CONFIG_XEN)

	unsigned int irq_hv_callback_count;

#endif

#if IS_ENABLED(CONFIG_HYPERV)

	unsigned int irq_hv_reenlightenment_count;

#endif

} ____cacheline_aligned irq_cpustat_t;



DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

arch/x86/kernel/irq.c

+9 −0
Original line number Diff line number Diff line
@@ -141,6 +141,15 @@ int arch_show_interrupts(struct seq_file *p, int prec) 
				   irq_stats(j)->irq_hv_callback_count);

		seq_puts(p, "  Hypervisor callback interrupts\n");

	}

#endif

#if IS_ENABLED(CONFIG_HYPERV)

	if (test_bit(HYPERV_REENLIGHTENMENT_VECTOR, system_vectors)) {

		seq_printf(p, "%*s: ", prec, "HRE");

		for_each_online_cpu(j)

			seq_printf(p, "%10u ",

				   irq_stats(j)->irq_hv_reenlightenment_count);

		seq_puts(p, "  Hyper-V reenlightenment interrupts\n");

	}

#endif

	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));

#if defined(CONFIG_X86_IO_APIC)