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From: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, Jonathan Corbet <corbet@lwn.net>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>
Cc: "H . Peter Anvin" <hpa@zytor.com>,
	Kuppuswamy Sathyanarayanan 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Andi Kleen <ak@linux.intel.com>, Tony Luck <tony.luck@intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>
Subject: [PATCH v3 3/5] x86/tdx: Expose TDX Guest #VE count in /proc/interrupts
Date: Thu,  5 Aug 2021 16:30:34 -0700	[thread overview]
Message-ID: <20210805233036.2949674-4-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210805233036.2949674-1-sathyanarayanan.kuppuswamy@linux.intel.com>

Add support to expose TD Guest Virtualization Exception (#VE) count
in /proc/interrupts. It is useful in performance analysis of TD Guest.

Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---

Changes since v2:
 * None

 arch/x86/include/asm/hardirq.h | 3 +++
 arch/x86/kernel/irq.c          | 6 ++++++
 arch/x86/kernel/traps.c        | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 275e7fd20310..07d79fa9c5c6 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -44,6 +44,9 @@ typedef struct {
 	unsigned int irq_hv_reenlightenment_count;
 	unsigned int hyperv_stimer0_count;
 #endif
+#if IS_ENABLED(CONFIG_INTEL_TDX_GUEST)
+	unsigned int tdg_ve_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 e28f6a5d14f1..669869bd46ec 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -181,6 +181,12 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 		seq_printf(p, "%10u ",
 			   irq_stats(j)->kvm_posted_intr_wakeup_ipis);
 	seq_puts(p, "  Posted-interrupt wakeup event\n");
+#endif
+#if IS_ENABLED(CONFIG_INTEL_TDX_GUEST)
+	seq_printf(p, "%*s: ", prec, "TGV");
+	for_each_online_cpu(j)
+		seq_printf(p, "%10u ", irq_stats(j)->tdg_ve_count);
+	seq_puts(p, "  TDX Guest VE event\n");
 #endif
 	return 0;
 }
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index be56f0281cb5..3673186876ec 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1187,6 +1187,8 @@ DEFINE_IDTENTRY(exc_virtualization_exception)
 
 	RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
 
+	inc_irq_stat(tdg_ve_count);
+
 	/*
 	 * NMIs/Machine-checks/Interrupts will be in a disabled state
 	 * till TDGETVEINFO TDCALL is executed. This prevents #VE
-- 
2.25.1


  parent reply	other threads:[~2021-08-05 23:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05 23:30 [PATCH v3 0/5] Add TDX Guest Support (Debug support) Kuppuswamy Sathyanarayanan
2021-08-05 23:30 ` [PATCH v3 1/5] x86/tdx: Add #VE tracepoint Kuppuswamy Sathyanarayanan
2021-08-05 23:30 ` [PATCH v3 2/5] x86/tdx: Add TDCALL tracepoint Kuppuswamy Sathyanarayanan
2021-08-05 23:30 ` Kuppuswamy Sathyanarayanan [this message]
2021-08-05 23:30 ` [PATCH v3 4/5] Add taint flag for TDX overrides Kuppuswamy Sathyanarayanan
2021-08-05 23:30 ` [PATCH v3 5/5] x86/tdx: Add option to override prot values Kuppuswamy Sathyanarayanan

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