From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38671) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSJGK-0004h3-6C for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:32:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSJGG-0004c1-88 for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:32:48 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:34156 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dSJGG-0004bX-1W for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:32:44 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v648TDvP082806 for ; Tue, 4 Jul 2017 04:32:42 -0400 Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) by mx0b-001b2d01.pphosted.com with ESMTP id 2bg6gcv39e-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 04 Jul 2017 04:32:42 -0400 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 4 Jul 2017 09:32:40 +0100 From: QingFeng Hao Date: Tue, 4 Jul 2017 10:32:31 +0200 In-Reply-To: <20170704083231.98056-1-haoqf@linux.vnet.ibm.com> References: <20170704083231.98056-1-haoqf@linux.vnet.ibm.com> Message-Id: <20170704083231.98056-2-haoqf@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH v3 1/1] virtio-scsi-ccw: use ioeventfd even when KVM is disabled List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: borntraeger@de.ibm.com, zyimin@linux.vnet.ibm.com, stefanha@redhat.com, kwolf@redhat.com, famz@redhat.com, peterx@redhat.com, cohuck@kernel.org, QingFeng Hao 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. 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 --- hw/s390x/virtio-ccw.c | 2 +- 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 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/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) -- 2.11.2