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ivshmem: Assert interrupts are set up once

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An interrupt is set up when the interrupt's file descriptor is
received.  Each message applies to the next interrupt vector.
Therefore, each vector cannot be set up more than once.

ivshmem_add_kvm_msi_virq() half-heartedly tries not to rely on this by
doing nothing then, but that's not going to recover from this error
should it become possible in the future.  watch_vector_notifier()
doesn't even try.

Simply assert what is the case, so we get alerted if we ever screw it
up.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1458066895-20632-22-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2016-03-15 19:34:36 +01:00
parent 2d1d422d11
commit 3c27969b3e
1 changed files with 2 additions and 5 deletions
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7
hw/misc/ivshmem.c
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@ -349,7 +349,7 @@ static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
{
int eventfd = event_notifier_get_fd(n);
/* if MSI is supported we need multiple interrupts */
assert(!s->msi_vectors[vector].pdev);
s->msi_vectors[vector].pdev = PCI_DEVICE(s);
qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
@ -535,10 +535,7 @@ static int ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector)
int ret;
IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector);
if (s->msi_vectors[vector].pdev != NULL) {
return 0;
}
assert(!s->msi_vectors[vector].pdev);
ret = kvm_irqchip_add_msi_route(kvm_state, msg, pdev);
if (ret < 0) {