[RFC,v3,4/4] Use macro to iterate over vcpus.

Message ID	1243504487-25796-5-git-send-email-gleb@redhat.com (mailing list archive)
State	New, archived
Headers	show 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 n4S9tnvV031211 for <patchwork-kvm@patchwork.kernel.org>; Thu, 28 May 2009 09:55:51 GMT From: Gleb Natapov <gleb@redhat.com> To: kvm@vger.kernel.org Subject: [PATCH RFC v3 4/4] Use macro to iterate over vcpus. Date: Thu, 28 May 2009 12:54:47 +0300 Message-Id: <1243504487-25796-5-git-send-email-gleb@redhat.com> In-Reply-To: <1243504487-25796-1-git-send-email-gleb@redhat.com> References: <1243504487-25796-1-git-send-email-gleb@redhat.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c index 3924591..c1c5cb6 100644 --- a/arch/ia64/kvm/kvm-ia64.c +++ b/arch/ia64/kvm/kvm-ia64.c @@ -337,13 +337,12 @@ static struct kvm_vcpu *lid_to_vcpu(struct kvm *kvm, unsigned long id, { union ia64_lid lid; int i; + struct kvm_vcpu *vcpu; - for (i = 0; i < kvm->arch.online_vcpus; i++) { - if (kvm->vcpus[i]) { - lid.val = VCPU_LID(kvm->vcpus[i]); - if (lid.id == id && lid.eid == eid) - return kvm->vcpus[i]; - } + kvm_for_each_vcpu(i, vcpu, kvm) { + lid.val = VCPU_LID(vcpu); + if (lid.id == id && lid.eid == eid) + return vcpu; } return NULL; @@ -409,21 +408,21 @@ static int handle_global_purge(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) struct kvm *kvm = vcpu->kvm; struct call_data call_data; int i; + struct kvm_vcpu *vcpui; call_data.ptc_g_data = p->u.ptc_g_data; - for (i = 0; i < kvm->arch.online_vcpus; i++) { - if (!kvm->vcpus[i] || kvm->vcpus[i]->arch.mp_state == - KVM_MP_STATE_UNINITIALIZED || - vcpu == kvm->vcpus[i]) + kvm_for_each_vcpu(i, vcpui, kvm) { + if (vcpui->arch.mp_state == KVM_MP_STATE_UNINITIALIZED || + vcpu == vcpui) continue; - if (waitqueue_active(&kvm->vcpus[i]->wq)) - wake_up_interruptible(&kvm->vcpus[i]->wq); + if (waitqueue_active(&vcpui->wq)) + wake_up_interruptible(&vcpui->wq); - if (kvm->vcpus[i]->cpu != -1) { - call_data.vcpu = kvm->vcpus[i]; - smp_call_function_single(kvm->vcpus[i]->cpu, + if (vcpui->cpu != -1) { + call_data.vcpu = vcpui; + smp_call_function_single(vcpui->cpu, vcpu_global_purge, &call_data, 1); } else printk(KERN_WARNING"kvm: Uninit vcpu received ipi!\n"); @@ -852,8 +851,6 @@ struct kvm *kvm_arch_create_vm(void) kvm_init_vm(kvm); - kvm->arch.online_vcpus = 0; - return kvm; } @@ -1356,8 +1353,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, goto fail; } - kvm->arch.online_vcpus++; - return vcpu; fail: return ERR_PTR(r); diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 2cf915e..7ad30e0 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -122,13 +122,17 @@ struct kvm *kvm_arch_create_vm(void) static void kvmppc_free_vcpus(struct kvm *kvm) { unsigned int i; + struct kvm_vcpu *vcpu; - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - kvm_arch_vcpu_free(kvm->vcpus[i]); - kvm->vcpus[i] = NULL; - } - } + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_arch_vcpu_free(vcpu); + + mutex_lock(&kvm->lock); + for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) + kvm->vcpus[i] = NULL; + + atomic_set(&kvm->online_vcpus, 0); + mutex_unlock(&kvm->lock); } void kvm_arch_sync_events(struct kvm *kvm) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 981ab04..217d3d3 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -209,13 +209,17 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) static void kvm_free_vcpus(struct kvm *kvm) { unsigned int i; + struct kvm_vcpu *vcpu; - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - kvm_arch_vcpu_destroy(kvm->vcpus[i]); - kvm->vcpus[i] = NULL; - } - } + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_arch_vcpu_destroy(vcpu); + + mutex_lock(&kvm->lock); + for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) + kvm->vcpus[i] = NULL; + + atomic_set(&kvm->online_vcpus, 0); + mutex_unlock(&kvm->lock); } void kvm_arch_sync_events(struct kvm *kvm) @@ -311,8 +315,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, BUG_ON(!kvm->arch.sca); if (!kvm->arch.sca->cpu[id].sda) kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block; - else - BUG_ON(!kvm->vcpus[id]); /* vcpu does already exist */ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32); vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; @@ -679,7 +681,8 @@ int kvm_arch_set_memory_region(struct kvm *kvm, struct kvm_memory_slot old, int user_alloc) { - int i; + int i, j = 0, r = -EINVAL; + struct kvm_vcpu *vcpu; /* A few sanity checks. We can have exactly one memory slot which has to start at guest virtual zero and which has to be located at a @@ -704,14 +707,10 @@ int kvm_arch_set_memory_region(struct kvm *kvm, return -EINVAL; /* request update of sie control block for all available vcpus */ - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - if (test_and_set_bit(KVM_REQ_MMU_RELOAD, - &kvm->vcpus[i]->requests)) - continue; - kvm_s390_inject_sigp_stop(kvm->vcpus[i], - ACTION_RELOADVCPU_ON_STOP); - } + kvm_for_each_vcpu(i, vcpu, kvm) { + if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests)) + continue; + kvm_s390_inject_sigp_stop(vcpus, ACTION_RELOADVCPU_ON_STOP); } return 0; diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 049cea2..ab96c9e 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -651,11 +651,8 @@ static void __inject_pit_timer_intr(struct kvm *kvm) * VCPU0, and only if its LVT0 is in EXTINT mode. */ if (kvm->arch.vapics_in_nmi_mode > 0) - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - vcpu = kvm->vcpus[i]; - if (vcpu) - kvm_apic_nmi_wd_deliver(vcpu); - } + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_apic_nmi_wd_deliver(vcpu); } void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 7030b5f..dac8dca 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1326,10 +1326,10 @@ static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm) { int i; + struct kvm_vcpu *vcpu; - for (i = 0; i < KVM_MAX_VCPUS; ++i) - if (kvm->vcpus[i]) - kvm->vcpus[i]->arch.last_pte_updated = NULL; + kvm_for_each_vcpu(i, vcpu, kvm) + vcpu->arch.last_pte_updated = NULL; } static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2b8f533..e3b3b25 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2902,10 +2902,7 @@ static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long va spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) { - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - vcpu = kvm->vcpus[i]; - if (!vcpu) - continue; + kvm_for_each_vcpu(i, vcpu, kvm) { if (vcpu->cpu != freq->cpu) continue; if (!kvm_request_guest_time_update(vcpu)) @@ -4634,20 +4631,22 @@ static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) static void kvm_free_vcpus(struct kvm *kvm) { unsigned int i; + struct kvm_vcpu *vcpu; /* * Unpin any mmu pages first. */ - for (i = 0; i < KVM_MAX_VCPUS; ++i) - if (kvm->vcpus[i]) - kvm_unload_vcpu_mmu(kvm->vcpus[i]); - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - kvm_arch_vcpu_free(kvm->vcpus[i]); - kvm->vcpus[i] = NULL; - } - } + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_unload_vcpu_mmu(vcpu); + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_arch_vcpu_free(vcpu); + + mutex_lock(&kvm->lock); + for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) + kvm->vcpus[i] = NULL; + atomic_set(&kvm->online_vcpus, 0); + mutex_unlock(&kvm->lock); } void kvm_arch_sync_events(struct kvm *kvm) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index e368a14..42080b8 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -171,6 +171,17 @@ struct kvm { #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt) #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt) +static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i) +{ + smp_rmb(); + return kvm->vcpus[i]; +} + +#define kvm_for_each_vcpu(idx, vcpup, kvm) \ + for (idx = 0, vcpup = kvm_get_vcpu(kvm, idx); \ + idx < atomic_read(&kvm->online_vcpus) && vcpup; \ + vcpup = kvm_get_vcpu(kvm, ++idx)) + int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu); diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index a8bd466..c010ea2 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -66,10 +66,8 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, kvm_is_dm_lowest_prio(irq)) printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); - for (i = 0; i < KVM_MAX_VCPUS; i++) { - vcpu = kvm->vcpus[i]; - - if (!vcpu || !kvm_apic_present(vcpu)) + kvm_for_each_vcpu(i, vcpu, kvm) { + if (!kvm_apic_present(vcpu)) continue; if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d65c637..2a90d29 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -741,10 +741,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) cpumask_clear(cpus); me = get_cpu(); - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - vcpu = kvm->vcpus[i]; - if (!vcpu) - continue; + kvm_for_each_vcpu(i, vcpu, kvm) { if (test_and_set_bit(req, &vcpu->requests)) continue; cpu = vcpu->cpu; @@ -1711,7 +1708,7 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu) static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) { int r; - struct kvm_vcpu *vcpu; + struct kvm_vcpu *vcpu, *v; vcpu = kvm_arch_vcpu_create(kvm, id); if (IS_ERR(vcpu)) @@ -1729,8 +1726,8 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) goto vcpu_destroy; } - for (r = 0; r < atomic_read(&kvm->online_vcpus); r++) - if (kvm->vcpus[r]->vcpu_id == id) { + kvm_for_each_vcpu(r, v, kvm) + if (v->vcpu_id == id) { r = -EEXIST; goto vcpu_destroy; } @@ -2510,11 +2507,9 @@ static int vcpu_stat_get(void *_offset, u64 *val) *val = 0; spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - vcpu = kvm->vcpus[i]; - if (vcpu) - *val += *(u32 *)((void *)vcpu + offset); - } + kvm_for_each_vcpu(i, vcpu, kvm) + *val += *(u32 *)((void *)vcpu + offset); + spin_unlock(&kvm_lock); return 0; }

[RFC,v3,4/4] Use macro to iterate over vcpus.

Commit Message

Patch