[Xen-changelog] [xen-unstable] Allow all unused GSI to be configured via IO-APIC by new pv_ops dom0

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1270112127 -3600
# Node ID 5374514774693ed2710596b8d1931256c01b02ee
# Parent  0bbf5454cd14cbf8631ceb55860ee2643b5c2ea3
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@xxxxxxxxxx>
---
 xen/arch/x86/mpparse.c |    4 ++++
 xen/arch/x86/physdev.c |    8 ++------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff -r 0bbf5454cd14 -r 537451477469 xen/arch/x86/mpparse.c
--- a/xen/arch/x86/mpparse.c    Thu Apr 01 09:47:49 2010 +0100
+++ b/xen/arch/x86/mpparse.c    Thu Apr 01 09:55:27 2010 +0100
@@ -1103,6 +1103,7 @@ int mp_register_gsi (u32 gsi, int trigge
        int                     ioapic = -1;
        int                     ioapic_pin = 0;
        int                     idx, bit = 0;
+
        /*
         * Mapping between Global System Interrups, which
         * represent all possible interrupts, and IRQs
@@ -1125,6 +1126,9 @@ int mp_register_gsi (u32 gsi, int trigge
 
        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  
diff -r 0bbf5454cd14 -r 537451477469 xen/arch/x86/physdev.c
--- a/xen/arch/x86/physdev.c    Thu Apr 01 09:47:49 2010 +0100
+++ b/xen/arch/x86/physdev.c    Thu Apr 01 09:55:27 2010 +0100
@@ -476,12 +476,8 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_H
         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:

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