x86: fully honor "nolapic"

Impact: widen the effect of the 'nolapic' boot parameter

"nolapic" should not only suppress SMP and use of the LAPIC, but it
also ought to have the effect of disabling all IO-APIC related activity
as well as PCI MSI and HT-IRQs.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index 1c4a1302536c..40747e58f305 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3258,6 +3258,9 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_ms
         int err;
         unsigned dest;
 
+        if (disable_apic)
+                return -ENXIO;
+
         cfg = irq_cfg(irq);
         err = assign_irq_vector(irq, cfg, TARGET_CPUS);
         if (err)
@@ -3726,6 +3729,9 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
         struct irq_cfg *cfg;
         int err;
 
+        if (disable_apic)
+                return -ENXIO;
+
         cfg = irq_cfg(irq);
         err = assign_irq_vector(irq, cfg, TARGET_CPUS);
         if (!err) {