Re: pvops-2.6.32 - Interrupt routing problem

[Bastian Blank <waldi@debian.org>]

On Mon, Mar 15, 2010 at 12:30:32PM +0800, Zhang, Xiantao wrote:
> Could you try the following patch ?  Currently, the GSI 0-15 's polarity and trigger mode are determined by hypervisor, and maybe hypervisor and dom0 has no agreement to determin them. Just follow dom0's setting with this patch, and I think it maybe work for you. 

No, it does not. mp_register_gsi also disallows reprogramming of already
setup IO-APIC entries. But if I force it with the following hack, it
works. So I would assume this a bug in the hypervisor to setup the GSI
without knowing anything about it.

Bastian

diff -r 4152a3ce90a7 xen/arch/x86/mpparse.c
--- a/xen/arch/x86/mpparse.c    Thu Mar 11 17:40:35 2010 +0000
+++ b/xen/arch/x86/mpparse.c    Mon Mar 15 11:09:27 2010 +0100
@@ -1143,5 +1143,5 @@
        if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
                Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
                        mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
+                if (mp_ioapic_routing[ioapic].apic_id == 8 && ioapic_pin == 14); else
                return -EEXIST;
        }
 
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