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From: | QingFeng Hao |
Subject: | Re: [Qemu-block] [PATCH 1/1] virtio-scsi-ccw: use ioeventfd even when KVM is disabled |
Date: | Mon, 3 Jul 2017 16:08:12 +0800 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
在 2017/7/3 15:41, Christian Borntraeger 写道:
I just want to mark that this patch is related with the former one from Stefan.On 07/03/2017 09:38 AM, QingFeng Hao wrote: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. 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 <address@hidden> Signed-off-by: Stefan Hajnoczi <address@hidden>cut'n'paste mistake of adding Stefans signoff? Otherwise it looks good.
Is that ok to add this sign-off? thanks!
--- hw/s390x/virtio-ccw.c | 2 +- target/s390x/kvm.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 90d37cb9ff..35896eb007 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -711,7 +711,7 @@ 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/kvm.c b/target/s390x/kvm.c index a3d00196f4..c37f9c3b9e 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -2220,6 +2220,9 @@ int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch, .addr = sch, .len = 8, }; + if (!kvm_enabled()) { + return 0; + } if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) { return -ENOSYS; }
-- Regards QingFeng Hao
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