[Xen-devel] [PATCH 16/17] xen: fix legacy irq setup, make ioapic-less machines work.

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>

If the machine has no IO APICs, then just allocate a set of legacy
interrupts.

[ Impact: fix Xen compatibility with old machines ]

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/xen/pci.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index 4b286f1..07b59fe 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -66,6 +66,12 @@ void __init xen_setup_pirqs(void)
 {
        int irq;
 
+       if (0 == nr_ioapics) {
+               for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
+                       xen_allocate_pirq(irq, "xt-pic");
+               return;
+       }
+
        /* Pre-allocate legacy irqs */
        for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
                int trigger, polarity;
-- 
1.6.0.6


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