Mailing List Archive

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# 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@debian.org>
---
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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