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xen-ia64-devel
[Xen-ia64-devel] RE: [PATCH] [Open GFW] Only use irq 10 and 11 for pci u
Tristan Gingold wrote:
> On Tue, Dec 25, 2007 at 03:22:37PM +0800, Zhang, Xiantao wrote:
>> Hi Tristan,
>> This patch fixes possible failures on windows boot in some
>> environment. Since current piix3 and piix4 in qemu only uses irq 10
>> and irq 11 for pci irqs, so here don't need to assign irq 5 and irq
>> 6 for this purpose. IRQ 6 may conflict with the irq of legacy floppy
>> disk controllers.
>
> I fear that with only 2 bits set, only INTA and INTB will be set.
> However from piix_pci-dm.c, it appears we don't really use INTA/D
> mapping.
> Am I right ?
Yes, you are right. Seems all pci device should get an irq >16 from the
algorithm. But for KVM, we also need to use assigned irqs for
INTA-INTD. But irq 6 shouldn't use for this purpose, it may confilicts
with floppy disk controller.
Xiantao
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