linux-kernel - [PATCH 1/1] x86/irq: Add hardcoded hypervisor interrupts to /proc/stat

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Date:   Mon, 27 Feb 2023 10:46:08 -0800
From:   Michael Kelley <mikelley@...rosoft.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, x86@...nel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     mikelley@...rosoft.com
Subject: [PATCH 1/1] x86/irq: Add hardcoded hypervisor interrupts to /proc/stat

Some hypervisor interrupts (such as for Hyper-V VMbus and Hyper-V timers)
have hardcoded interrupt vectors on x86 and don't have Linux IRQs assigned.
These interrupts are shown in /proc/interrupts, but are not reported in
the first field of the "intr" line in /proc/stat because the x86 version
of arch_irq_stat_cpu() doesn't include them.

Fix this by adding code to arch_irq_stat_cpu() to include these interrupts,
similar to existing interrupts that don't have Linux IRQs.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/kernel/irq.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 766ffe3..9f668d2 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -211,6 +211,13 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
 #ifdef CONFIG_X86_MCE_THRESHOLD
 	sum += irq_stats(cpu)->irq_threshold_count;
 #endif
+#ifdef CONFIG_X86_HV_CALLBACK_VECTOR
+	sum += irq_stats(cpu)->irq_hv_callback_count;
+#endif
+#if IS_ENABLED(CONFIG_HYPERV)
+	sum += irq_stats(cpu)->irq_hv_reenlightenment_count;
+	sum += irq_stats(cpu)->hyperv_stimer0_count;
+#endif
 #ifdef CONFIG_X86_MCE
 	sum += per_cpu(mce_exception_count, cpu);
 	sum += per_cpu(mce_poll_count, cpu);
-- 
1.8.3.1