From patchwork Wed Jul 29 08:47:01 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wu, Feng" X-Patchwork-Id: 6890801 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 19FE7C05AC for ; Wed, 29 Jul 2015 09:00:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D2965207D2 for ; Wed, 29 Jul 2015 09:00:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7FFEF207D0 for ; Wed, 29 Jul 2015 09:00:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751348AbbG2I7X (ORCPT ); Wed, 29 Jul 2015 04:59:23 -0400 Received: from mga14.intel.com ([192.55.52.115]:60018 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752081AbbG2I7T (ORCPT ); Wed, 29 Jul 2015 04:59:19 -0400 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP; 29 Jul 2015 01:59:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,569,1432623600"; d="scan'208";a="615065323" Received: from feng-bdw-de-pi.bj.intel.com ([10.238.154.67]) by orsmga003.jf.intel.com with ESMTP; 29 Jul 2015 01:59:16 -0700 From: Feng Wu To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: pbonzini@redhat.com, alex.williamson@redhat.com, joro@8bytes.org, eric.auger@linaro.org, feng.wu@intel.com Subject: [v3 3/5] KVM: create kvm_irqfd.h Date: Wed, 29 Jul 2015 16:47:01 +0800 Message-Id: <1438159623-4227-4-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1438159623-4227-1-git-send-email-feng.wu@intel.com> References: <1438159623-4227-1-git-send-email-feng.wu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Eric Auger Move _irqfd_resampler and _irqfd struct declarations in a new public header: kvm_irqfd.h. They are respectively renamed into kvm_kernel_irqfd_resampler and kvm_kernel_irqfd. Those datatypes will be used by architecture specific code, in the context of IRQ bypass manager integration. Signed-off-by: Eric Auger --- include/linux/kvm_irqfd.h | 69 ++++++++++++++++++++++++++++++++++ virt/kvm/eventfd.c | 95 ++++++++++++----------------------------------- 2 files changed, 92 insertions(+), 72 deletions(-) create mode 100644 include/linux/kvm_irqfd.h diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h new file mode 100644 index 0000000..f926b39 --- /dev/null +++ b/include/linux/kvm_irqfd.h @@ -0,0 +1,69 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * irqfd: Allows an fd to be used to inject an interrupt to the guest + * Credit goes to Avi Kivity for the original idea. + */ + +#ifndef __LINUX_KVM_IRQFD_H +#define __LINUX_KVM_IRQFD_H + +#include +#include + +/* + * Resampling irqfds are a special variety of irqfds used to emulate + * level triggered interrupts. The interrupt is asserted on eventfd + * trigger. On acknowledgment through the irq ack notifier, the + * interrupt is de-asserted and userspace is notified through the + * resamplefd. All resamplers on the same gsi are de-asserted + * together, so we don't need to track the state of each individual + * user. We can also therefore share the same irq source ID. + */ +struct kvm_kernel_irqfd_resampler { + struct kvm *kvm; + /* + * List of resampling struct _irqfd objects sharing this gsi. + * RCU list modified under kvm->irqfds.resampler_lock + */ + struct list_head list; + struct kvm_irq_ack_notifier notifier; + /* + * Entry in list of kvm->irqfd.resampler_list. Use for sharing + * resamplers among irqfds on the same gsi. + * Accessed and modified under kvm->irqfds.resampler_lock + */ + struct list_head link; +}; + +struct kvm_kernel_irqfd { + /* Used for MSI fast-path */ + struct kvm *kvm; + wait_queue_t wait; + /* Update side is protected by irqfds.lock */ + struct kvm_kernel_irq_routing_entry irq_entry; + seqcount_t irq_entry_sc; + /* Used for level IRQ fast-path */ + int gsi; + struct work_struct inject; + /* The resampler used by this irqfd (resampler-only) */ + struct kvm_kernel_irqfd_resampler *resampler; + /* Eventfd notified on resample (resampler-only) */ + struct eventfd_ctx *resamplefd; + /* Entry in list of irqfds for a resampler (resampler-only) */ + struct list_head resampler_link; + /* Used for setup/shutdown */ + struct eventfd_ctx *eventfd; + struct list_head list; + poll_table pt; + struct work_struct shutdown; +}; + +#endif /* __LINUX_KVM_IRQFD_H */ diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 9ff4193..647ffb8 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -39,68 +40,14 @@ #include #ifdef CONFIG_HAVE_KVM_IRQFD -/* - * -------------------------------------------------------------------- - * irqfd: Allows an fd to be used to inject an interrupt to the guest - * - * Credit goes to Avi Kivity for the original idea. - * -------------------------------------------------------------------- - */ - -/* - * Resampling irqfds are a special variety of irqfds used to emulate - * level triggered interrupts. The interrupt is asserted on eventfd - * trigger. On acknowledgement through the irq ack notifier, the - * interrupt is de-asserted and userspace is notified through the - * resamplefd. All resamplers on the same gsi are de-asserted - * together, so we don't need to track the state of each individual - * user. We can also therefore share the same irq source ID. - */ -struct _irqfd_resampler { - struct kvm *kvm; - /* - * List of resampling struct _irqfd objects sharing this gsi. - * RCU list modified under kvm->irqfds.resampler_lock - */ - struct list_head list; - struct kvm_irq_ack_notifier notifier; - /* - * Entry in list of kvm->irqfd.resampler_list. Use for sharing - * resamplers among irqfds on the same gsi. - * Accessed and modified under kvm->irqfds.resampler_lock - */ - struct list_head link; -}; - -struct _irqfd { - /* Used for MSI fast-path */ - struct kvm *kvm; - wait_queue_t wait; - /* Update side is protected by irqfds.lock */ - struct kvm_kernel_irq_routing_entry irq_entry; - seqcount_t irq_entry_sc; - /* Used for level IRQ fast-path */ - int gsi; - struct work_struct inject; - /* The resampler used by this irqfd (resampler-only) */ - struct _irqfd_resampler *resampler; - /* Eventfd notified on resample (resampler-only) */ - struct eventfd_ctx *resamplefd; - /* Entry in list of irqfds for a resampler (resampler-only) */ - struct list_head resampler_link; - /* Used for setup/shutdown */ - struct eventfd_ctx *eventfd; - struct list_head list; - poll_table pt; - struct work_struct shutdown; -}; static struct workqueue_struct *irqfd_cleanup_wq; static void irqfd_inject(struct work_struct *work) { - struct _irqfd *irqfd = container_of(work, struct _irqfd, inject); + struct kvm_kernel_irqfd *irqfd = + container_of(work, struct kvm_kernel_irqfd, inject); struct kvm *kvm = irqfd->kvm; if (!irqfd->resampler) { @@ -121,12 +68,13 @@ irqfd_inject(struct work_struct *work) static void irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian) { - struct _irqfd_resampler *resampler; + struct kvm_kernel_irqfd_resampler *resampler; struct kvm *kvm; - struct _irqfd *irqfd; + struct kvm_kernel_irqfd *irqfd; int idx; - resampler = container_of(kian, struct _irqfd_resampler, notifier); + resampler = container_of(kian, + struct kvm_kernel_irqfd_resampler, notifier); kvm = resampler->kvm; kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, @@ -141,9 +89,9 @@ irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian) } static void -irqfd_resampler_shutdown(struct _irqfd *irqfd) +irqfd_resampler_shutdown(struct kvm_kernel_irqfd *irqfd) { - struct _irqfd_resampler *resampler = irqfd->resampler; + struct kvm_kernel_irqfd_resampler *resampler = irqfd->resampler; struct kvm *kvm = resampler->kvm; mutex_lock(&kvm->irqfds.resampler_lock); @@ -168,7 +116,8 @@ irqfd_resampler_shutdown(struct _irqfd *irqfd) static void irqfd_shutdown(struct work_struct *work) { - struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown); + struct kvm_kernel_irqfd *irqfd = + container_of(work, struct kvm_kernel_irqfd, shutdown); u64 cnt; /* @@ -198,7 +147,7 @@ irqfd_shutdown(struct work_struct *work) /* assumes kvm->irqfds.lock is held */ static bool -irqfd_is_active(struct _irqfd *irqfd) +irqfd_is_active(struct kvm_kernel_irqfd *irqfd) { return list_empty(&irqfd->list) ? false : true; } @@ -209,7 +158,7 @@ irqfd_is_active(struct _irqfd *irqfd) * assumes kvm->irqfds.lock is held */ static void -irqfd_deactivate(struct _irqfd *irqfd) +irqfd_deactivate(struct kvm_kernel_irqfd *irqfd) { BUG_ON(!irqfd_is_active(irqfd)); @@ -224,7 +173,8 @@ irqfd_deactivate(struct _irqfd *irqfd) static int irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key) { - struct _irqfd *irqfd = container_of(wait, struct _irqfd, wait); + struct kvm_kernel_irqfd *irqfd = + container_of(wait, struct kvm_kernel_irqfd, wait); unsigned long flags = (unsigned long)key; struct kvm_kernel_irq_routing_entry irq; struct kvm *kvm = irqfd->kvm; @@ -274,12 +224,13 @@ static void irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh, poll_table *pt) { - struct _irqfd *irqfd = container_of(pt, struct _irqfd, pt); + struct kvm_kernel_irqfd *irqfd = + container_of(pt, struct kvm_kernel_irqfd, pt); add_wait_queue(wqh, &irqfd->wait); } /* Must be called under irqfds.lock */ -static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd) +static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd) { struct kvm_kernel_irq_routing_entry *e; struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS]; @@ -304,7 +255,7 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd) static int kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) { - struct _irqfd *irqfd, *tmp; + struct kvm_kernel_irqfd *irqfd, *tmp; struct fd f; struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL; int ret; @@ -340,7 +291,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) irqfd->eventfd = eventfd; if (args->flags & KVM_IRQFD_FLAG_RESAMPLE) { - struct _irqfd_resampler *resampler; + struct kvm_kernel_irqfd_resampler *resampler; resamplefd = eventfd_ctx_fdget(args->resamplefd); if (IS_ERR(resamplefd)) { @@ -525,7 +476,7 @@ kvm_eventfd_init(struct kvm *kvm) static int kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args) { - struct _irqfd *irqfd, *tmp; + struct kvm_kernel_irqfd *irqfd, *tmp; struct eventfd_ctx *eventfd; eventfd = eventfd_ctx_fdget(args->fd); @@ -581,7 +532,7 @@ kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args) void kvm_irqfd_release(struct kvm *kvm) { - struct _irqfd *irqfd, *tmp; + struct kvm_kernel_irqfd *irqfd, *tmp; spin_lock_irq(&kvm->irqfds.lock); @@ -604,7 +555,7 @@ kvm_irqfd_release(struct kvm *kvm) */ void kvm_irq_routing_update(struct kvm *kvm) { - struct _irqfd *irqfd; + struct kvm_kernel_irqfd *irqfd; spin_lock_irq(&kvm->irqfds.lock);