KVM: Use macro to iterate over vcpus.

[christian: remove unused variables on s390]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index d1f7bcd..5c766bd 100644 (file)
--- 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 < atomic_read(&kvm->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 < atomic_read(&kvm->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");

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2cf915e..7ad30e0 100644 (file)
--- 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 098bfa6..07ced89 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -211,13 +211,17 @@ 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)
@@ -314,8 +318,6 @@ 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;
 
@@ -683,6 +685,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
                                int user_alloc)
 {
        int i;
+       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
@@ -707,14 +710,10 @@ 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(vcpu, ACTION_RELOADVCPU_ON_STOP);
        }
 
        return 0;

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 06d8f84..15fc95b 100644 (file)
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -669,11 +669,8 @@ 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 d443a42..5f97dbd 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1347,10 +1347,10 @@ 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 d8adc1d..89862a8 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2946,10 +2946,7 @@ 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))
@@ -4678,20 +4675,22 @@ 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 d3fdf1a..c6e4d02 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -179,6 +179,17 @@ 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 08a9a49..bb8a1b5 100644 (file)
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -68,10 +68,8 @@ 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 25e1f9c..777fe53 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -738,10 +738,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 
        me = get_cpu();
        spin_lock(&kvm->requests_lock);
-       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;
@@ -1718,7 +1715,7 @@ 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))
@@ -1736,8 +1733,8 @@ 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;
                }
@@ -2526,11 +2523,9 @@ 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;
 }