From patchwork Fri Aug 10 22:37:33 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 1307021 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 06CAC3FC33 for ; Fri, 10 Aug 2012 22:38:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760393Ab2HJWhi (ORCPT ); Fri, 10 Aug 2012 18:37:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:1165 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760385Ab2HJWhe (ORCPT ); Fri, 10 Aug 2012 18:37:34 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q7AMbXpk020391 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 10 Aug 2012 18:37:34 -0400 Received: from bling.home ([10.3.113.16]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q7AMbXuY023766; Fri, 10 Aug 2012 18:37:33 -0400 From: Alex Williamson Subject: [PATCH v8 3/6] kvm: Add IRQ source ID option to KVM_IRQFD To: avi@redhat.com, mst@redhat.com Cc: gleb@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 10 Aug 2012 16:37:33 -0600 Message-ID: <20120810223731.809.67249.stgit@bling.home> In-Reply-To: <20120810223633.809.44188.stgit@bling.home> References: <20120810223633.809.44188.stgit@bling.home> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This allows specifying an IRQ source ID to be used when injecting an interrupt. When not specified KVM_USERSPACE_IRQ_SOURCE_ID is used. Signed-off-by: Alex Williamson --- Documentation/virtual/kvm/api.txt | 5 +++++ arch/x86/kvm/x86.c | 1 + include/linux/kvm.h | 6 +++++- virt/kvm/eventfd.c | 14 ++++++++++---- 4 files changed, 21 insertions(+), 5 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/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 062cfd5..46f4b4d 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1946,6 +1946,11 @@ the guest using the specified gsi pin. The irqfd is removed using the KVM_IRQFD_FLAG_DEASSIGN flag, specifying both kvm_irqfd.fd and kvm_irqfd.gsi. +When KVM_CAP_IRQFD_IRQ_SOURCE_ID is available, KVM_IRQFD supports the +KVM_IRQFD_FLAG_IRQ_SOURCE_ID which can be used to specify an IRQ +source ID (see KVM_IRQ_SOURCE_ID) to be used for the guest interrupt. +This flag has no effect on deassignment. + 4.76 KVM_PPC_ALLOCATE_HTAB Capability: KVM_CAP_PPC_ALLOC_HTAB diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 75e743e..946c5bd 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2174,6 +2174,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_GET_TSC_KHZ: case KVM_CAP_PCI_2_3: case KVM_CAP_KVMCLOCK_CTRL: + case KVM_CAP_IRQFD_IRQ_SOURCE_ID: r = 1; break; case KVM_CAP_COALESCED_MMIO: diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 67b6b49..deda8a9 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -619,6 +619,7 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_S390_COW 79 #define KVM_CAP_PPC_ALLOC_HTAB 80 #define KVM_CAP_NR_IRQ_SOURCE_ID 81 +#define KVM_CAP_IRQFD_IRQ_SOURCE_ID 82 #ifdef KVM_CAP_IRQ_ROUTING @@ -684,12 +685,15 @@ struct kvm_xen_hvm_config { #endif #define KVM_IRQFD_FLAG_DEASSIGN (1 << 0) +/* Available with KVM_CAP_IRQFD_IRQ_SOURCE_ID */ +#define KVM_IRQFD_FLAG_IRQ_SOURCE_ID (1 << 1) struct kvm_irqfd { __u32 fd; __u32 gsi; __u32 flags; - __u8 pad[20]; + __u32 irq_source_id; + __u8 pad[16]; }; #define KVM_IRQ_SOURCE_ID_FLAG_DEASSIGN (1 << 0) diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 7d7e2aa..30150f1 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -51,6 +51,7 @@ struct _irqfd { struct kvm_kernel_irq_routing_entry __rcu *irq_entry; /* Used for level IRQ fast-path */ int gsi; + int irq_source_id; struct work_struct inject; /* Used for setup/shutdown */ struct eventfd_ctx *eventfd; @@ -67,8 +68,8 @@ irqfd_inject(struct work_struct *work) struct _irqfd *irqfd = container_of(work, struct _irqfd, inject); struct kvm *kvm = irqfd->kvm; - kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1); - kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0); + kvm_set_irq(kvm, irqfd->irq_source_id, irqfd->gsi, 1); + kvm_set_irq(kvm, irqfd->irq_source_id, irqfd->gsi, 0); } /* @@ -138,7 +139,7 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key) irq = rcu_dereference(irqfd->irq_entry); /* An event has been signaled, inject an interrupt */ if (irq) - kvm_set_msi(irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1); + kvm_set_msi(irq, kvm, irqfd->irq_source_id, 1); else schedule_work(&irqfd->inject); rcu_read_unlock(); @@ -213,6 +214,10 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) irqfd->kvm = kvm; irqfd->gsi = args->gsi; + if (args->flags & KVM_IRQFD_FLAG_IRQ_SOURCE_ID) + irqfd->irq_source_id = args->irq_source_id; + else + irqfd->irq_source_id = KVM_USERSPACE_IRQ_SOURCE_ID; INIT_LIST_HEAD(&irqfd->list); INIT_WORK(&irqfd->inject, irqfd_inject); INIT_WORK(&irqfd->shutdown, irqfd_shutdown); @@ -340,7 +345,8 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args) int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args) { - if (args->flags & ~KVM_IRQFD_FLAG_DEASSIGN) + if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | + KVM_IRQFD_FLAG_IRQ_SOURCE_ID)) return -EINVAL; if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)