From patchwork Thu May 21 16:51:19 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory Haskins X-Patchwork-Id: 25261 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 n4LGqQMk024252 for ; Thu, 21 May 2009 16:52:27 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755270AbZEUQvb (ORCPT ); Thu, 21 May 2009 12:51:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755660AbZEUQvb (ORCPT ); Thu, 21 May 2009 12:51:31 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:50421 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755270AbZEUQv2 (ORCPT ); Thu, 21 May 2009 12:51:28 -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); Thu, 21 May 2009 10:51:22 -0600 Received: from dev.haskins.net (localhost [127.0.0.1]) by dev.haskins.net (Postfix) with ESMTP id 1FCBC464228; Thu, 21 May 2009 12:51:19 -0400 (EDT) From: Gregory Haskins Subject: [KVM PATCH v3 2/4] kvm: add return value to kvm_io_bus_register_dev To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, avi@redhat.com, mtosatti@redhat.com Date: Thu, 21 May 2009 12:51:19 -0400 Message-ID: <20090521165118.14851.66865.stgit@dev.haskins.net> In-Reply-To: <20090521165059.14851.83681.stgit@dev.haskins.net> References: <20090521165059.14851.83681.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 Today this function returns void and will internally BUG_ON if it fails. We want to create dynamic MMIO/PIO entries driven from userspace later in the series, so enhance this API to return an error code on failure. We also fix up all the callsites to check the return code, handle any failures, and percolate the error up to the caller. Signed-off-by: Gregory Haskins --- arch/x86/kvm/i8254.c | 27 +++++++++++++++++---------- arch/x86/kvm/i8259.c | 9 ++++++++- include/linux/kvm_host.h | 4 ++-- virt/kvm/coalesced_mmio.c | 8 ++++++-- virt/kvm/ioapic.c | 9 +++++++-- virt/kvm/kvm_main.c | 7 +++++-- 6 files changed, 45 insertions(+), 19 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/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 4d6f0d2..3ef8b1b 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -564,33 +564,36 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm) { struct kvm_pit *pit; struct kvm_kpit_state *pit_state; + int ret; pit = kzalloc(sizeof(struct kvm_pit), GFP_KERNEL); if (!pit) return NULL; pit->irq_source_id = kvm_request_irq_source_id(kvm); - if (pit->irq_source_id < 0) { - kfree(pit); - return NULL; - } - - mutex_init(&pit->pit_state.lock); - mutex_lock(&pit->pit_state.lock); - spin_lock_init(&pit->pit_state.inject_lock); + if (pit->irq_source_id < 0) + goto fail; /* Initialize PIO device */ pit->dev.read = pit_ioport_read; pit->dev.write = pit_ioport_write; pit->dev.in_range = pit_in_range; pit->dev.private = pit; - kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev); + ret = kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev); + if (ret < 0) + goto fail; pit->speaker_dev.read = speaker_ioport_read; pit->speaker_dev.write = speaker_ioport_write; pit->speaker_dev.in_range = speaker_in_range; pit->speaker_dev.private = pit; - kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev); + ret = kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev); + if (ret < 0) + goto fail; + + mutex_init(&pit->pit_state.lock); + mutex_lock(&pit->pit_state.lock); + spin_lock_init(&pit->pit_state.inject_lock); kvm->arch.vpit = pit; pit->kvm = kvm; @@ -611,6 +614,10 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm) kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier); return pit; + +fail: + kfree(pit); + return NULL; } void kvm_free_pit(struct kvm *kvm) diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 1ccb50c..0caf7d4 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -519,6 +519,8 @@ static void pic_irq_request(void *opaque, int level) struct kvm_pic *kvm_create_pic(struct kvm *kvm) { struct kvm_pic *s; + int ret; + s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL); if (!s) return NULL; @@ -538,6 +540,11 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm) s->dev.write = picdev_write; s->dev.in_range = picdev_in_range; s->dev.private = s; - kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev); + ret = kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev); + if (ret < 0) { + kfree(s); + return NULL; + } + return s; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 28bd112..5289552 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -61,8 +61,8 @@ void kvm_io_bus_init(struct kvm_io_bus *bus); void kvm_io_bus_destroy(struct kvm_io_bus *bus); struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr, int len, int is_write); -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, - struct kvm_io_device *dev); +int kvm_io_bus_register_dev(struct kvm_io_bus *bus, + struct kvm_io_device *dev); struct kvm_vcpu { struct kvm *kvm; diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index 5ae620d..ede9087 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -86,6 +86,7 @@ static void coalesced_mmio_destructor(struct kvm_io_device *this) int kvm_coalesced_mmio_init(struct kvm *kvm) { struct kvm_coalesced_mmio_dev *dev; + int ret; dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL); if (!dev) @@ -96,9 +97,12 @@ int kvm_coalesced_mmio_init(struct kvm *kvm) dev->dev.private = dev; dev->kvm = kvm; kvm->coalesced_mmio_dev = dev; - kvm_io_bus_register_dev(&kvm->mmio_bus, &dev->dev); - return 0; + ret = kvm_io_bus_register_dev(&kvm->mmio_bus, &dev->dev); + if (ret < 0) + kfree(dev); + + return ret; } int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm, diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 1eddae9..9be89f5 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -317,6 +317,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic) int kvm_ioapic_init(struct kvm *kvm) { struct kvm_ioapic *ioapic; + int ret; ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); if (!ioapic) @@ -328,7 +329,11 @@ int kvm_ioapic_init(struct kvm *kvm) ioapic->dev.in_range = ioapic_in_range; ioapic->dev.private = ioapic; ioapic->kvm = kvm; - kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev); - return 0; + + ret = kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev); + if (ret < 0) + kfree(ioapic); + + return ret; } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index de042cb..c71f276 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2463,11 +2463,14 @@ struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, return NULL; } -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) +int kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) { - BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); + if (bus->dev_count > (NR_IOBUS_DEVS-1)) + return -ENOSPC; bus->devs[bus->dev_count++] = dev; + + return 0; } static struct notifier_block kvm_cpu_notifier = {