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

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Date:	Wed, 27 May 2009 00:37:29 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Greg KH <gregkh@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	Chris Wright <chrisw@...hat.com>, kurt.hackel@...cle.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ky Srinivasan <ksrinivasan@...ell.com>,
	Beulich <jbeulich@...ell.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Gerd Hoffmann <kraxel@...i.home.kraxel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 16/17] xen: fix legacy irq setup, make ioapic-less machines work.

From: Gerd Hoffmann <kraxel@...i.home.kraxel.org>

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@...i.home.kraxel.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 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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