From patchwork Fri Feb 22 12:09:49 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 2175791 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id B23C03FCFC for ; Fri, 22 Feb 2013 12:10:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756395Ab3BVMKM (ORCPT ); Fri, 22 Feb 2013 07:10:12 -0500 Received: from e06smtp13.uk.ibm.com ([195.75.94.109]:49828 "EHLO e06smtp13.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755933Ab3BVMJ4 (ORCPT ); Fri, 22 Feb 2013 07:09:56 -0500 Received: from /spool/local by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Tsirkin" Subject: [RFC PATCH v2 4/4] KVM: s390: Wire up ioeventfd. Date: Fri, 22 Feb 2013 13:09:49 +0100 Message-Id: <1361534989-38884-5-git-send-email-cornelia.huck@de.ibm.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1361534989-38884-1-git-send-email-cornelia.huck@de.ibm.com> References: <1361534989-38884-1-git-send-email-cornelia.huck@de.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13022212-2966-0000-0000-000006CE4C67 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Enable ioeventfd support on s390 and hook up diagnose 500 virtio-ccw notifications. Signed-off-by: Cornelia Huck --- arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/diag.c | 25 +++++++++++++++++++++++++ arch/s390/kvm/kvm-s390.c | 1 + 4 files changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index b58dd86..3c43e30 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -22,6 +22,7 @@ config KVM select PREEMPT_NOTIFIERS select ANON_INODES select HAVE_KVM_CPU_RELAX_INTERCEPT + select HAVE_KVM_EVENTFD ---help--- Support hosting paravirtualized guest machines using the SIE virtualization capability on the mainframe. This should work diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile index 3975722..8fe9d65 100644 --- a/arch/s390/kvm/Makefile +++ b/arch/s390/kvm/Makefile @@ -6,7 +6,7 @@ # it under the terms of the GNU General Public License (version 2 only) # as published by the Free Software Foundation. -common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o) +common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o eventfd.o) ccflags-y := -Ivirt/kvm -Iarch/s390/kvm diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index a390687..13cf74a 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -104,6 +104,29 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu) return -EREMOTE; } +static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu) +{ + int ret, idx; + + /* No virtio-ccw notification? Get out quickly. */ + if (!vcpu->kvm->arch.css_support || + (vcpu->run->s.regs.gprs[1] != 3)) + return -EOPNOTSUPP; + + idx = srcu_read_lock(&vcpu->kvm->srcu); + /* + * The layout is as follows: + * - gpr 2 contains the subchannel id (passed as addr) + * - gpr 3 contains the virtqueue index (passed as datamatch) + */ + ret = kvm_io_bus_write(vcpu->kvm, KVM_CSS_BUS, + vcpu->run->s.regs.gprs[2], + 8, &vcpu->run->s.regs.gprs[3]); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + /* kvm_io_bus_write returns -EOPNOTSUPP if it found no match. */ + return ret; +} + int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) { int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16; @@ -118,6 +141,8 @@ int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) return __diag_time_slice_end_directed(vcpu); case 0x308: return __diag_ipl_functions(vcpu); + case 0x500: + return __diag_virtio_hypercall(vcpu); default: return -EOPNOTSUPP; } diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index f822d36..04d2454 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -142,6 +142,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_ONE_REG: case KVM_CAP_ENABLE_CAP: case KVM_CAP_S390_CSS_SUPPORT: + case KVM_CAP_IOEVENTFD: r = 1; break; case KVM_CAP_NR_VCPUS: