x86/irq: Count Hyper-V reenlightenment interrupts

Web:        https://git.kernel.org/torvalds/c/51d4e5daa32808df4d50db511d167fde19fa114e
Commit:     51d4e5daa32808df4d50db511d167fde19fa114e
Parent:     e7c4e36c447daca2b7df49024f6bf230871cb155
Refname:    refs/heads/master
Author:     Vitaly Kuznetsov <[email protected]>
AuthorDate: Wed Jan 24 14:23:35 2018 +0100
Committer:  Thomas Gleixner <[email protected]>
CommitDate: Tue Jan 30 23:55:33 2018 +0100

    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: Vitaly Kuznetsov <[email protected]>
    Signed-off-by: Thomas Gleixner <[email protected]>
    Reviewed-by: Thomas Gleixner <[email protected]>
    Cc: Stephen Hemminger <[email protected]>
    Cc: [email protected]
    Cc: Radim Krčmář <[email protected]>
    Cc: Haiyang Zhang <[email protected]>
    Cc: "Michael Kelley (EOSG)" <[email protected]>
    Cc: Roman Kagan <[email protected]>
    Cc: Andy Lutomirski <[email protected]>
    Cc: [email protected]
    Cc: Paolo Bonzini <[email protected]>
    Cc: "K. Y. Srinivasan" <[email protected]>
    Cc: Cathy Avery <[email protected]>
    Cc: Mohammed Gamal <[email protected]>
    Link: https://lkml.kernel.org/r/[email protected]
---
 arch/x86/hyperv/hv_init.c      | 2 ++
 arch/x86/include/asm/hardirq.h | 3 +++
 arch/x86/kernel/irq.c          | 9 +++++++++
 3 files changed, 14 insertions(+)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index e4377e2f2a10..a3adece392f1 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -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();
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 51cc979dd364..7c341a74ec8c 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -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);
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 68e1867cca80..45fb4d2565f8 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -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)
--
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