From patchwork Mon Apr 27 19:00:05 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory Haskins X-Patchwork-Id: 20213 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n3RJ0HXv017462 for ; Mon, 27 Apr 2009 19:00:18 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752609AbZD0TAO (ORCPT ); Mon, 27 Apr 2009 15:00:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753187AbZD0TAO (ORCPT ); Mon, 27 Apr 2009 15:00:14 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:44506 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752283AbZD0TAN (ORCPT ); Mon, 27 Apr 2009 15:00:13 -0400 Received: from dev.haskins.net (prv-ext-foundry1.gns.novell.com [137.65.251.240]) by victor.provo.novell.com with ESMTP (TLS encrypted); Mon, 27 Apr 2009 13:00:09 -0600 Received: from dev.haskins.net (localhost [127.0.0.1]) by dev.haskins.net (Postfix) with ESMTP id 043C74641F6; Mon, 27 Apr 2009 15:00:06 -0400 (EDT) From: Gregory Haskins Subject: [PATCH v3] qemu-kvm: add irqfd support To: kvm@vger.kernel.org Cc: avi@redhat.com Date: Mon, 27 Apr 2009 15:00:05 -0400 Message-ID: <20090427185857.7226.93800.stgit@dev.haskins.net> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org (Applies to qemu-kvm.git 8f7a30dbc40a1d4c09275566f9ed9647ed1ee50f) irqfd lets you create an eventfd based file-desriptor to inject interrupts to a kvm guest. We associate one gsi per fd for fine-grained routing. Signed-off-by: Gregory Haskins --- kvm/libkvm/libkvm.c | 18 ++++++++++++++++++ kvm/libkvm/libkvm.h | 14 ++++++++++++++ 2 files changed, 32 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/kvm/libkvm/libkvm.c b/kvm/libkvm/libkvm.c index 0610e3f..dc9a951 100644 --- a/kvm/libkvm/libkvm.c +++ b/kvm/libkvm/libkvm.c @@ -1440,3 +1440,21 @@ int kvm_assign_set_msix_entry(kvm_context_t kvm, return ret; } #endif + +int kvm_irqfd(kvm_context_t kvm, int gsi, int flags) +{ + int r; + struct kvm_irqfd data = { + .gsi = gsi, + .flags = flags, + }; + + if (!kvm_check_extension(kvm, KVM_CAP_IRQFD)) + return -ENOENT; + + r = ioctl(kvm->vm_fd, KVM_IRQFD, &data); + if (r == -1) + r = -errno; + return r; +} + diff --git a/kvm/libkvm/libkvm.h b/kvm/libkvm/libkvm.h index ce6f054..89a8893 100644 --- a/kvm/libkvm/libkvm.h +++ b/kvm/libkvm/libkvm.h @@ -856,6 +856,20 @@ int kvm_commit_irq_routes(kvm_context_t kvm); */ int kvm_get_irq_route_gsi(kvm_context_t kvm); +/*! + * \brief Create a file descriptor for injecting interrupts + * + * Creates an eventfd based file-descriptor that maps to a specific GSI + * in the guest. eventfd compliant signaling (write() from userspace, or + * eventfd_signal() from kernelspace) will cause the GSI to inject + * itself into the guest at the next available window. + * + * \param kvm Pointer to the current kvm_context + * \param gsi GSI to assign to this fd + * \param flags reserved, must be zero + */ +int kvm_irqfd(kvm_context_t kvm, int gsi, int flags); + #ifdef KVM_CAP_DEVICE_MSIX int kvm_assign_set_msix_nr(kvm_context_t kvm, struct kvm_assigned_msix_nr *msix_nr);