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From:   Xin Li <xin3.li@intel.com>
To:     linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org
Cc:     tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org,
        andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com,
        ravi.v.shankar@intel.com
Subject: [RFC PATCH 01/32] x86/traps: let common_interrupt() handle IRQ_MOVE_CLEANUP_VECTOR
Date:   Mon, 19 Dec 2022 22:36:27 -0800
Message-Id: <20221220063658.19271-2-xin3.li@intel.com>
In-Reply-To: <20221220063658.19271-1-xin3.li@intel.com>
References: <20221220063658.19271-1-xin3.li@intel.com>
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From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

IRQ_MOVE_CLEANUP_VECTOR is the only one of the system IRQ vectors that
is *below* FIRST_SYSTEM_VECTOR. It is a slow path, so just push it
into common_interrupt() just before the spurious interrupt handling.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
---
 arch/x86/kernel/irq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 766ffe3ba313..7e125fff45ab 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -248,6 +248,10 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
 	desc = __this_cpu_read(vector_irq[vector]);
 	if (likely(!IS_ERR_OR_NULL(desc))) {
 		handle_irq(desc, regs);
+#ifdef CONFIG_SMP
+	} else if (vector == IRQ_MOVE_CLEANUP_VECTOR) {
+		sysvec_irq_move_cleanup(regs);
+#endif
 	} else {
 		ack_APIC_irq();
 
-- 
2.34.1