linux-kernel - [PATCH] x86/irq: hide HYP in /proc/interrupts when not on Xen/Hyper-V

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Date:	Fri,  3 Jul 2015 13:27:14 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	x86@...nel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Radim Krčmář <rkrcmar@...hat.com>,
	Andrew Jones <drjones@...hat.com>
Subject: [PATCH] x86/irq: hide HYP in /proc/interrupts when not on Xen/Hyper-V

Hypervisor callback interrupts are only accounted on Xen/Hyper-V and we
detect hypervisor's type in early boot. There is no point in having
always-zero HYP: line on other hypervisors or bare metal.

Suggested-by: Radim Krčmář <rkrcmar@...hat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kernel/irq.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 88b36648..0c82064 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -18,6 +18,7 @@
 #include <asm/mce.h>
 #include <asm/hw_irq.h>
 #include <asm/desc.h>
+#include <asm/hypervisor.h>
 
 #define CREATE_TRACE_POINTS
 #include <asm/trace/irq_vectors.h>
@@ -139,10 +140,14 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 	seq_puts(p, "  Machine check polls\n");
 #endif
 #if IS_ENABLED(CONFIG_HYPERV) || defined(CONFIG_XEN)
-	seq_printf(p, "%*s: ", prec, "HYP");
-	for_each_online_cpu(j)
-		seq_printf(p, "%10u ", irq_stats(j)->irq_hv_callback_count);
-	seq_puts(p, "  Hypervisor callback interrupts\n");
+	if (x86_hyper == &x86_hyper_ms_hyperv ||
+	    x86_hyper == &x86_hyper_xen) {
+		seq_printf(p, "%*s: ", prec, "HYP");
+		for_each_online_cpu(j)
+			seq_printf(p, "%10u ",
+				   irq_stats(j)->irq_hv_callback_count);
+		seq_puts(p, "  Hypervisor callback interrupts\n");
+	}
 #endif
 	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 #if defined(CONFIG_X86_IO_APIC)
-- 
2.4.3

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