From 3c27969b3e7397bb63f363fc8b8bc0e601542d76 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Tue, 15 Mar 2016 19:34:36 +0100 Subject: ivshmem: Assert interrupts are set up once MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Marc-André Lureau Message-Id: <1458066895-20632-22-git-send-email-armbru@redhat.com> --- hw/misc/ivshmem.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'hw') diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 65e3a76870..61e21cd80c 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -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) { -- cgit v1.2.1