From patchwork Fri Jul 15 11:43:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 9231757 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2E7C76075D for ; Fri, 15 Jul 2016 11:43:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1F6FE27F86 for ; Fri, 15 Jul 2016 11:43:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1429528325; Fri, 15 Jul 2016 11:43:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 848CC27F86 for ; Fri, 15 Jul 2016 11:43:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932805AbcGOLnM (ORCPT ); Fri, 15 Jul 2016 07:43:12 -0400 Received: from foss.arm.com ([217.140.101.70]:48644 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932774AbcGOLm7 (ORCPT ); Fri, 15 Jul 2016 07:42:59 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 98925BA2; Fri, 15 Jul 2016 04:44:05 -0700 (PDT) Received: from e104803-lin.lan (unknown [10.1.203.153]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3EC0B3F25F; Fri, 15 Jul 2016 04:42:58 -0700 (PDT) From: Andre Przywara To: Marc Zyngier , Christoffer Dall , Eric Auger Cc: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v10 05/17] KVM: kvm_io_bus: add kvm_io_bus_get_dev() call Date: Fri, 15 Jul 2016 12:43:26 +0100 Message-Id: <20160715114338.10484-6-andre.przywara@arm.com> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20160715114338.10484-1-andre.przywara@arm.com> References: <20160715114338.10484-1-andre.przywara@arm.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The kvm_io_bus framework is a nice place of holding information about various MMIO regions for kernel emulated devices. Add a call to retrieve the kvm_io_device structure which is associated with a certain MMIO address. This avoids to duplicate kvm_io_bus' knowledge of MMIO regions without having to fake MMIO calls if a user needs the device a certain MMIO address belongs to. This will be used by the ITS emulation to get the associated ITS device when someone triggers an MSI via an ioctl from userspace. Signed-off-by: Andre Przywara Reviewed-by: Eric Auger Acked-by: Christoffer Dall Acked-by: Paolo Bonzini --- include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 24 ++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 0640ee9..614a981 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -164,6 +164,8 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, struct kvm_io_device *dev); int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, struct kvm_io_device *dev); +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, + gpa_t addr); #ifdef CONFIG_KVM_ASYNC_PF struct kvm_async_pf { diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ef54b4c..bd2eb92 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3496,6 +3496,30 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, return r; } +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, + gpa_t addr) +{ + struct kvm_io_bus *bus; + int dev_idx, srcu_idx; + struct kvm_io_device *iodev = NULL; + + srcu_idx = srcu_read_lock(&kvm->srcu); + + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); + + dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); + if (dev_idx < 0) + goto out_unlock; + + iodev = bus->range[dev_idx].dev; + +out_unlock: + srcu_read_unlock(&kvm->srcu, srcu_idx); + + return iodev; +} +EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); + static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, };