diff options
| author | QingFeng Hao <haoqf@linux.vnet.ibm.com> | 2017-07-04 15:23:50 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-07-05 19:45:02 +0200 |
| commit | cda3c19ff56d1b567631ce17f7a3bdb47cfa9455 (patch) | |
| tree | 809d6805695ddd4c2288a1fc6469a6833faa96c5 | |
| parent | 38cba1f4d83525e728719d7ac6e9551cddfadee6 (diff) | |
virtio-scsi-ccw: use ioeventfd even when KVM is disabled
This patch is based on a similar patch from Stefan Hajnoczi -
commit c324fd0a39c ("virtio-pci: use ioeventfd even when KVM is disabled")
Do not check kvm_eventfds_enabled() when KVM is disabled since it
always returns 0. Since commit 8c56c1a592b5092d91da8d8943c17777d6462a6f
("memory: emulate ioeventfd") it has been possible to use ioeventfds in
qtest or TCG mode.
This patch makes -device virtio-scsi-ccw,iothread=iothread0 work even
when KVM is disabled.
Currently we don't have an equivalent to "memory: emulate ioeventfd"
for ccw yet, but that this doesn't hurt and qemu-iotests 068 can pass with
skipping iothread arguments.
I have tested that virtio-scsi-ccw works under tcg both with and without
iothread.
This patch fixes qemu-iotests 068, which was accidentally merged early
despite the dependency on ioeventfd.
Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20170704132350.11874-2-haoqf@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| -rw-r--r-- | hw/s390x/virtio-ccw.c | 2 | ||||
| -rw-r--r-- | target/s390x/cpu.h | 6 |
2 files changed, 6 insertions, 2 deletions
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index f0e7fc8e9b..e18fd2600d 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -789,7 +789,7 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) sch->cssid, sch->ssid, sch->schid, sch->devno, ccw_dev->devno.valid ? "user-configured" : "auto-configured"); - if (!kvm_eventfds_enabled()) { + if (kvm_enabled() && !kvm_eventfds_enabled()) { dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; } diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index 9faca04b52..bdb9bdbc9d 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -1264,7 +1264,11 @@ static inline int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, int vq, bool assign) { - return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign); + if (kvm_enabled()) { + return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign); + } else { + return 0; + } } static inline void s390_crypto_reset(void) |