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x86/idt: Keep spurious entries unset in system_vectors
[ Upstream commit1f1fbc70c1
] With commitdc20b2d526
("x86/idt: Move interrupt gate initialization to IDT code") non assigned system vectors are also marked as used in 'used_vectors' (now 'system_vectors') bitmap. This makes checks in arch_show_interrupts() whether a particular system vector is allocated to always pass and e.g. 'Hyper-V reenlightenment interrupts' entry always shows up in /proc/interrupts. Another side effect of having all unassigned system vectors marked as used is that irq_matrix_debug_show() will wrongly count them among 'System' vectors. As it is now ensured that alloc_intr_gate() is not called after init, it is possible to leave unused entries in 'system_vectors' unset to fix these issues. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200428093824.1451532-4-vkuznets@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -318,7 +318,11 @@ void __init idt_setup_apic_and_irq_gates(void)
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#ifdef CONFIG_X86_LOCAL_APIC
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for_each_clear_bit_from(i, system_vectors, NR_VECTORS) {
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set_bit(i, system_vectors);
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/*
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* Don't set the non assigned system vectors in the
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* system_vectors bitmap. Otherwise they show up in
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* /proc/interrupts.
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*/
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entry = spurious_entries_start + 8 * (i - FIRST_SYSTEM_VECTOR);
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set_intr_gate(i, entry);
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}
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