From patchwork Wed Jan 25 04:27:39 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoffer Dall X-Patchwork-Id: 137697 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 7980A1007D3 for ; Wed, 25 Jan 2012 15:28:17 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753736Ab2AYE1z (ORCPT ); Tue, 24 Jan 2012 23:27:55 -0500 Received: from mail-qw0-f46.google.com ([209.85.216.46]:35785 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753307Ab2AYE1y (ORCPT ); Tue, 24 Jan 2012 23:27:54 -0500 Received: by qadc10 with SMTP id c10so609201qad.19 for ; Tue, 24 Jan 2012 20:27:43 -0800 (PST) Received: by 10.224.183.5 with SMTP id ce5mr18644518qab.35.1327465662960; Tue, 24 Jan 2012 20:27:42 -0800 (PST) Received: from [127.0.0.1] (cpe-66-108-186-108.nyc.res.rr.com. [66.108.186.108]) by mx.google.com with ESMTPS id eb5sm37520053qab.10.2012.01.24.20.27.41 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 24 Jan 2012 20:27:42 -0800 (PST) Subject: [PATCH v2] KVM: Factor out kvm_vcpu_kick to arch-generic code To: kvm@vger.kernel.org From: Christoffer Dall Cc: Marc.Zyngier@arm.com, mtosatti@redhat.com, agraf@suse.de, kvm-ppc@vger.kernel.org, avi@redhat.com, tech@virtualopensystems.com Date: Tue, 24 Jan 2012 23:27:39 -0500 Message-ID: <20120125042739.16236.95639.stgit@localhost> User-Agent: StGit/0.15 MIME-Version: 1.0 Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org The kvm_vcpu_kick function performs roughly the same funcitonality on most all architectures, so we shouldn't have separate copies. PowerPC keeps a pointer to interchanging waitqueues on the vcpu_arch structure and to accomodate this special need a __KVM_HAVE_ARCH_VCPU_GET_WQ define and accompanying function kvm_arch_vcpu_wq have been defined. For all other architectures this is a generic inline that just returns &vcpu->wq; This patch applies to Linus' tree on the Linux 3.3-rc1 tag. Changes since v1: - Abstact CPU mode check into arch-specific function - Remove redundant vcpu->cpu assignment Signed-off-by: Christoffer Dall --- arch/ia64/include/asm/kvm_host.h | 1 + arch/ia64/kvm/kvm-ia64.c | 16 ---------------- arch/powerpc/include/asm/kvm_host.h | 6 ++++++ arch/powerpc/kvm/powerpc.c | 18 +++++++----------- arch/s390/kvm/kvm-s390.c | 8 ++++++++ arch/x86/kvm/x86.c | 17 ++--------------- include/linux/kvm_host.h | 9 +++++++++ virt/kvm/kvm_main.c | 23 +++++++++++++++++++++++ 8 files changed, 56 insertions(+), 42 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" 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/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h index 2689ee5..06a5e91 100644 --- a/arch/ia64/include/asm/kvm_host.h +++ b/arch/ia64/include/asm/kvm_host.h @@ -365,6 +365,7 @@ struct thash_cb { }; struct kvm_vcpu_stat { + u32 halt_wakeup; }; struct kvm_vcpu_arch { diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c index 43f4c92..428eb0b 100644 --- a/arch/ia64/kvm/kvm-ia64.c +++ b/arch/ia64/kvm/kvm-ia64.c @@ -1402,7 +1402,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { if (cpu != vcpu->cpu) { - vcpu->cpu = cpu; if (vcpu->arch.ht_active) kvm_migrate_hlt_timer(vcpu); } @@ -1851,21 +1850,6 @@ void kvm_arch_hardware_unsetup(void) { } -void kvm_vcpu_kick(struct kvm_vcpu *vcpu) -{ - int me; - int cpu = vcpu->cpu; - - if (waitqueue_active(&vcpu->wq)) - wake_up_interruptible(&vcpu->wq); - - me = get_cpu(); - if (cpu != me && (unsigned) cpu < nr_cpu_ids && cpu_online(cpu)) - if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests)) - smp_send_reschedule(cpu); - put_cpu(); -} - int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq) { return __apic_accept_irq(vcpu, irq->vector); diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index bf8af5d..b687444 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -438,4 +438,10 @@ struct kvm_vcpu_arch { #define KVMPPC_VCPU_BUSY_IN_HOST 1 #define KVMPPC_VCPU_RUNNABLE 2 +#define __KVM_HAVE_ARCH_VCPU_GET_WQ 1 +static inline wait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.wqp; +} + #endif /* __POWERPC_KVM_HOST_H__ */ diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 607fbdf..dd0c929 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -42,6 +42,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) !!(v->arch.pending_exceptions); } +int kvm_arch_vcpu_in_guest_mode(struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; +} + int kvmppc_kvm_pv(struct kvm_vcpu *vcpu) { int nr = kvmppc_get_gpr(vcpu, 11); @@ -311,10 +316,7 @@ static void kvmppc_decrementer_func(unsigned long data) kvmppc_core_queue_dec(vcpu); - if (waitqueue_active(vcpu->arch.wqp)) { - wake_up_interruptible(vcpu->arch.wqp); - vcpu->stat.halt_wakeup++; - } + kvm_vcpu_kick(vcpu); } /* @@ -363,7 +365,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) mtspr(SPRN_VRSAVE, vcpu->arch.vrsave); #endif kvmppc_core_vcpu_load(vcpu, cpu); - vcpu->cpu = smp_processor_id(); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) @@ -572,12 +573,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) kvmppc_core_queue_external(vcpu, irq); - if (waitqueue_active(vcpu->arch.wqp)) { - wake_up_interruptible(vcpu->arch.wqp); - vcpu->stat.halt_wakeup++; - } else if (vcpu->cpu != -1) { - smp_send_reschedule(vcpu->cpu); - } + kvm_vcpu_kick(vcpu); return 0; } diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d1c44573..5e2217f 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -380,6 +380,14 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) return 0; } +int kvm_arch_vcpu_in_guest_mode(struct kvm_vcpu *vcpu) +{ + /* kvm common code refers to this, but never calls it */ + BUG(); + return 0; +} + + static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) { kvm_s390_vcpu_initial_reset(vcpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c38efd7..a1761ff 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2252,7 +2252,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); if (vcpu->cpu != cpu) kvm_migrate_timers(vcpu); - vcpu->cpu = cpu; } accumulate_steal_time(vcpu); @@ -6688,21 +6687,9 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) kvm_cpu_has_interrupt(vcpu)); } -void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +int kvm_arch_vcpu_in_guest_mode(struct kvm_vcpu *vcpu) { - int me; - int cpu = vcpu->cpu; - - if (waitqueue_active(&vcpu->wq)) { - wake_up_interruptible(&vcpu->wq); - ++vcpu->stat.halt_wakeup; - } - - me = get_cpu(); - if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) - if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE) - smp_send_reschedule(cpu); - put_cpu(); + return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; } int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index d526231..b1339ee 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -407,6 +407,7 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, gfn_t gfn); void kvm_vcpu_block(struct kvm_vcpu *vcpu); +void kvm_vcpu_kick(struct kvm_vcpu *vcpu); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu); void kvm_resched(struct kvm_vcpu *vcpu); void kvm_load_guest_fpu(struct kvm_vcpu *vcpu); @@ -474,6 +475,7 @@ int kvm_arch_hardware_setup(void); void kvm_arch_hardware_unsetup(void); void kvm_arch_check_processor_compat(void *rtn); int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu); +int kvm_arch_vcpu_in_guest_mode(struct kvm_vcpu *vcpu); void kvm_free_physmem(struct kvm *kvm); @@ -489,6 +491,13 @@ static inline void kvm_arch_free_vm(struct kvm *kvm) } #endif +#ifndef __KVM_HAVE_ARCH_VCPU_GET_WQ +static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) +{ + return &vcpu->wq; +} +#endif + int kvm_arch_init_vm(struct kvm *kvm); void kvm_arch_destroy_vm(struct kvm *kvm); void kvm_free_all_assigned_devices(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d9cfb78..c9109bd 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -153,6 +153,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) cpu = get_cpu(); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); + vcpu->cpu = cpu; put_cpu(); } @@ -1528,6 +1529,28 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) finish_wait(&vcpu->wq, &wait); } +/* + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. + */ +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +{ + int me; + int cpu = vcpu->cpu; + wait_queue_head_t *wqp; + + wqp = kvm_arch_vcpu_wq(vcpu); + if (waitqueue_active(wqp)) { + wake_up_interruptible(wqp); + ++vcpu->stat.halt_wakeup; + } + + me = get_cpu(); + if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) + if (kvm_arch_vcpu_in_guest_mode(vcpu)) + smp_send_reschedule(cpu); + put_cpu(); +} + void kvm_resched(struct kvm_vcpu *vcpu) { if (!need_resched())