From: Keir Fraser <keir.fraser@citrix.com>
Date: Thu, 1 Apr 2010 08:55:27 +0000 (+0100)
Subject: Allow all unused GSI to be configured via IO-APIC by new pv_ops dom0
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~12450
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=2b6f2f6805276aaec45d83088c11eeb8d74bb195;p=xen.git

Allow all unused GSI to be configured via IO-APIC by new pv_ops dom0

Currently Xen disallows setting up any GSI < 16. This makes it
impossible by the kernel to use any PCI devices without ACPI override
but a mapping to this interrupts via IO-APIC.

The patch allows all unused interrupts to be setup via IO-APIC.

Signed-off-by: Bastian Blank <waldi@debian.org>
---

diff --git a/xen/arch/x86/mpparse.c b/xen/arch/x86/mpparse.c
index 1917862cd3..95aff543f2 100644
--- a/xen/arch/x86/mpparse.c
+++ b/xen/arch/x86/mpparse.c
@@ -1103,6 +1103,7 @@ int mp_register_gsi (u32 gsi, int triggering, int polarity)
 	int			ioapic = -1;
 	int			ioapic_pin = 0;
 	int			idx, bit = 0;
+
 	/*
 	 * Mapping between Global System Interrups, which
 	 * represent all possible interrupts, and IRQs
@@ -1126,6 +1127,9 @@ int mp_register_gsi (u32 gsi, int triggering, int polarity)
 	if (ioapic_renumber_irq)
 		gsi = ioapic_renumber_irq(ioapic, gsi);
 
+	if (!(irq_to_desc(gsi)->status & IRQ_DISABLED))
+		return -EEXIST;
+
 	/* 
 	 * Avoid pin reprogramming.  PRTs typically include entries  
 	 * with redundant pin->gsi mappings (but unique PCI devices);
diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index b0d777a6e8..baaff24ba2 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -476,12 +476,8 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE(void) arg)
         ret = -EINVAL;
         if ( setup_gsi.gsi < 0 || setup_gsi.gsi >= nr_irqs_gsi )
             break;
-        /* GSI < 16 has been setup by hypervisor */
-        if ( setup_gsi.gsi >= 16 )
-            ret = mp_register_gsi(setup_gsi.gsi, setup_gsi.triggering,
-                            setup_gsi.polarity);
-        else 
-            ret = -EEXIST;
+        ret = mp_register_gsi(setup_gsi.gsi, setup_gsi.triggering,
+                              setup_gsi.polarity);
         break; 
     }
     default: