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s390x: adapter routes error handling

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If the kernel irqchip has been disabled, we don't want the
{add,release}_adapter_routes routines to call any kvm_irqchip_*
interfaces, as they may rely on an irqchip actually having been
created. Just take a quick exit in that case instead. If you are
trying to use irqfd without a kernel irqchip, we will fail with
an error.

Also initialize routes->gsi[] with -1 in the virtio-ccw handling,
to make sure we don't trip over other errors, either. (Nobody
else uses the gsi array in that structure.)

Fixes: d426d9fba8 ("s390x/virtio-ccw: wire up irq routing and irqfds")
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20200117111147.5006-1-cohuck@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck 2020-01-16 13:10:35 +01:00
parent 9208270b6b
commit 3c5fd80743
2 changed files with 12 additions and 0 deletions
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8
hw/intc/s390_flic_kvm.c
View File

@ -331,6 +331,10 @@ static int kvm_s390_add_adapter_routes(S390FLICState *fs,
int ret, i;
uint64_t ind_offset = routes->adapter.ind_offset;
if (!kvm_gsi_routing_enabled()) {
return -ENOSYS;
}
for (i = 0; i < routes->num_routes; i++) {
ret = kvm_irqchip_add_adapter_route(kvm_state, &routes->adapter);
if (ret < 0) {
@ -358,6 +362,10 @@ static void kvm_s390_release_adapter_routes(S390FLICState *fs,
{
int i;
if (!kvm_gsi_routing_enabled()) {
return;
}
for (i = 0; i < routes->num_routes; i++) {
if (routes->gsi[i] >= 0) {
kvm_irqchip_release_virq(kvm_state, routes->gsi[i]);

4
hw/s390x/virtio-ccw.c
View File

@ -697,6 +697,7 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
SubchDev *sch;
Error *err = NULL;
int i;
sch = css_create_sch(ccw_dev->devno, errp);
if (!sch) {
@ -717,6 +718,9 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
ccw_dev->sch = sch;
dev->indicators = NULL;
dev->revision = -1;
for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) {
dev->routes.gsi[i] = -1;
}
css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
trace_virtio_ccw_new_device(