From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: [PATCH v2] kvm: fix irqfd build failure discovered in linux-next Date: Thu, 21 May 2009 09:28:18 -0400 Message-ID: <20090521132817.8218.92948.stgit@dev.haskins.net> References: <20090521172122.bb12027c.sfr@canb.auug.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from victor.provo.novell.com ([137.65.250.26]:58142 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752563AbZEUN2W (ORCPT ); Thu, 21 May 2009 09:28:22 -0400 In-Reply-To: <20090521172122.bb12027c.sfr@canb.auug.org.au> Sender: linux-next-owner@vger.kernel.org List-ID: To: avi@redhat.com Cc: linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, sfr@canb.auug.org.au, kvm@vger.kernel.org Stephen Rothwell noted a build failure in arch != x86 in last nights linux-next tree, as noted here: http://lkml.org/lkml/2009/5/21/32 This patch corrects the build issue by requiring explicit support for IRQFD to be defined, and only defining it on x86 (the only arch fully supported). The code itself isnt architecture dependent, but we need to add a new file to each makefile, advertise the capability, and of course, test that it works for each supported arch. We will submit patches against each relevant arch at a later time to enable support there as well. Signed-off-by: Gregory Haskins --- arch/x86/kvm/Kconfig | 4 ++++ include/linux/kvm_host.h | 17 +++++++++++++++++ virt/kvm/eventfd.c | 6 ++++++ virt/kvm/kvm_main.c | 2 +- 4 files changed, 28 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 8600a09..6460091 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -8,6 +8,10 @@ config HAVE_KVM_IRQCHIP bool default y +config HAVE_KVM_EVENTFD + bool + default y + menuconfig VIRTUALIZATION bool "Virtualization" depends on HAVE_KVM || X86 diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3b6caf5..28bd112 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -134,7 +134,9 @@ struct kvm { struct list_head vm_list; struct kvm_io_bus mmio_bus; struct kvm_io_bus pio_bus; +#ifdef CONFIG_HAVE_KVM_EVENTFD struct list_head irqfds; +#endif struct kvm_vm_stat stat; struct kvm_arch arch; atomic_t users_count; @@ -529,7 +531,22 @@ static inline void kvm_free_irq_routing(struct kvm *kvm) {} #endif +#ifdef CONFIG_HAVE_KVM_EVENTFD + +void kvm_irqfd_init(struct kvm *kvm); int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags); void kvm_irqfd_release(struct kvm *kvm); +#else + +static inline void kvm_irqfd_init(struct kvm *kvm) {} +static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags) +{ + return -EINVAL; +} + +static inline void kvm_irqfd_release(struct kvm *kvm) {} + +#endif /* CONFIG_HAVE_KVM_EVENTFD */ + #endif diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 72a282e..c63ff6a 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -206,6 +206,12 @@ kvm_deassign_irqfd(struct kvm *kvm, int fd, int gsi) return count ? count : -ENOENT; } +void +kvm_irqfd_init(struct kvm *kvm) +{ + INIT_LIST_HEAD(&kvm->irqfds); +} + int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags) { diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b58837d..de042cb 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -983,7 +983,7 @@ static struct kvm *kvm_create_vm(void) atomic_inc(&kvm->mm->mm_count); spin_lock_init(&kvm->mmu_lock); kvm_io_bus_init(&kvm->pio_bus); - INIT_LIST_HEAD(&kvm->irqfds); + kvm_irqfd_init(kvm); mutex_init(&kvm->lock); kvm_io_bus_init(&kvm->mmio_bus); init_rwsem(&kvm->slots_lock);