[Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device

[Cam Macdonell <cam@cs.ualberta.ca>]

On Mon, May 10, 2010 at 5:59 AM, Avi Kivity <avi@redhat.com> wrote:
> On 04/21/2010 08:53 PM, Cam Macdonell wrote:

>> +
>> +        /* allocate/initialize space for interrupt handling */
>> +        s->eventfds = qemu_mallocz(s->nr_alloc_guests * sizeof(int *));
>> +        s->eventfd_table = qemu_mallocz(s->vectors *
>> sizeof(EventfdEntry));
>> +        s->eventfds_posn_count = qemu_mallocz(s->nr_alloc_guests *
>> sizeof(int));
>> +
>> +        pci_conf[PCI_INTERRUPT_PIN] = 1; /* we are going to support
>> interrupts */
>>
>
> This is done by the guest BIOS.
>
>

If I remove that line, my driver crashes when it falls back to
pin-based interrupts (when MSI is turned off).  Is there something in
the device driver that I need to set in place of this?  A number of
other devices (mostly network cards) set the interrupt pin this way,
so I'm a little confused.