From fa8273e9549b3cee2947d1aebe5242e7a25eb3de Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 17 Feb 2010 14:00:41 +0000 Subject: [PATCH] KVM: Convert i8254/i8259 locks to raw_spinlocks The i8254/i8259 locks need to be real spinlocks on preempt-rt. Convert them to raw_spinlock. No change for !RT kernels. Signed-off-by: Thomas Gleixner Signed-off-by: Avi Kivity --- arch/x86/kvm/i8254.c | 10 +++++----- arch/x86/kvm/i8254.h | 2 +- arch/x86/kvm/i8259.c | 31 ++++++++++++++++--------------- arch/x86/kvm/irq.h | 2 +- arch/x86/kvm/x86.c | 8 ++++---- 5 files changed, 27 insertions(+), 26 deletions(-) diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index c9569f20dfba..294698b6daff 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -242,11 +242,11 @@ static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian) { struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state, irq_ack_notifier); - spin_lock(&ps->inject_lock); + raw_spin_lock(&ps->inject_lock); if (atomic_dec_return(&ps->pit_timer.pending) < 0) atomic_inc(&ps->pit_timer.pending); ps->irq_ack = 1; - spin_unlock(&ps->inject_lock); + raw_spin_unlock(&ps->inject_lock); } void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu) @@ -624,7 +624,7 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags) mutex_init(&pit->pit_state.lock); mutex_lock(&pit->pit_state.lock); - spin_lock_init(&pit->pit_state.inject_lock); + raw_spin_lock_init(&pit->pit_state.inject_lock); kvm->arch.vpit = pit; pit->kvm = kvm; @@ -724,12 +724,12 @@ void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu) /* Try to inject pending interrupts when * last one has been acked. */ - spin_lock(&ps->inject_lock); + raw_spin_lock(&ps->inject_lock); if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) { ps->irq_ack = 0; inject = 1; } - spin_unlock(&ps->inject_lock); + raw_spin_unlock(&ps->inject_lock); if (inject) __inject_pit_timer_intr(kvm); } diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h index d4c1c7ffdc09..900d6b0ba7c2 100644 --- a/arch/x86/kvm/i8254.h +++ b/arch/x86/kvm/i8254.h @@ -27,7 +27,7 @@ struct kvm_kpit_state { u32 speaker_data_on; struct mutex lock; struct kvm_pit *pit; - spinlock_t inject_lock; + raw_spinlock_t inject_lock; unsigned long irq_ack; struct kvm_irq_ack_notifier irq_ack_notifier; }; diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index a3711f9e580f..07771da85de5 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -44,18 +44,19 @@ static void pic_clear_isr(struct kvm_kpic_state *s, int irq) * Other interrupt may be delivered to PIC while lock is dropped but * it should be safe since PIC state is already updated at this stage. */ - spin_unlock(&s->pics_state->lock); + raw_spin_unlock(&s->pics_state->lock); kvm_notify_acked_irq(s->pics_state->kvm, SELECT_PIC(irq), irq); - spin_lock(&s->pics_state->lock); + raw_spin_lock(&s->pics_state->lock); } void kvm_pic_clear_isr_ack(struct kvm *kvm) { struct kvm_pic *s = pic_irqchip(kvm); - spin_lock(&s->lock); + + raw_spin_lock(&s->lock); s->pics[0].isr_ack = 0xff; s->pics[1].isr_ack = 0xff; - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); } /* @@ -156,9 +157,9 @@ static void pic_update_irq(struct kvm_pic *s) void kvm_pic_update_irq(struct kvm_pic *s) { - spin_lock(&s->lock); + raw_spin_lock(&s->lock); pic_update_irq(s); - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); } int kvm_pic_set_irq(void *opaque, int irq, int level) @@ -166,14 +167,14 @@ int kvm_pic_set_irq(void *opaque, int irq, int level) struct kvm_pic *s = opaque; int ret = -1; - spin_lock(&s->lock); + raw_spin_lock(&s->lock); if (irq >= 0 && irq < PIC_NUM_PINS) { ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, level); pic_update_irq(s); trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr, s->pics[irq >> 3].imr, ret == 0); } - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); return ret; } @@ -203,7 +204,7 @@ int kvm_pic_read_irq(struct kvm *kvm) int irq, irq2, intno; struct kvm_pic *s = pic_irqchip(kvm); - spin_lock(&s->lock); + raw_spin_lock(&s->lock); irq = pic_get_irq(&s->pics[0]); if (irq >= 0) { pic_intack(&s->pics[0], irq); @@ -228,7 +229,7 @@ int kvm_pic_read_irq(struct kvm *kvm) intno = s->pics[0].irq_base + irq; } pic_update_irq(s); - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); return intno; } @@ -442,7 +443,7 @@ static int picdev_write(struct kvm_io_device *this, printk(KERN_ERR "PIC: non byte write\n"); return 0; } - spin_lock(&s->lock); + raw_spin_lock(&s->lock); switch (addr) { case 0x20: case 0x21: @@ -455,7 +456,7 @@ static int picdev_write(struct kvm_io_device *this, elcr_ioport_write(&s->pics[addr & 1], addr, data); break; } - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); return 0; } @@ -472,7 +473,7 @@ static int picdev_read(struct kvm_io_device *this, printk(KERN_ERR "PIC: non byte read\n"); return 0; } - spin_lock(&s->lock); + raw_spin_lock(&s->lock); switch (addr) { case 0x20: case 0x21: @@ -486,7 +487,7 @@ static int picdev_read(struct kvm_io_device *this, break; } *(unsigned char *)val = data; - spin_unlock(&s->lock); + raw_spin_unlock(&s->lock); return 0; } @@ -520,7 +521,7 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm) s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL); if (!s) return NULL; - spin_lock_init(&s->lock); + raw_spin_lock_init(&s->lock); s->kvm = kvm; s->pics[0].elcr_mask = 0xf8; s->pics[1].elcr_mask = 0xde; diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index 0b71d480ebf1..34b15915754d 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -62,7 +62,7 @@ struct kvm_kpic_state { }; struct kvm_pic { - spinlock_t lock; + raw_spinlock_t lock; unsigned pending_acks; struct kvm *kvm; struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */ diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 86b739f8f173..f6ae4875d9d0 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2542,18 +2542,18 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) r = 0; switch (chip->chip_id) { case KVM_IRQCHIP_PIC_MASTER: - spin_lock(&pic_irqchip(kvm)->lock); + raw_spin_lock(&pic_irqchip(kvm)->lock); memcpy(&pic_irqchip(kvm)->pics[0], &chip->chip.pic, sizeof(struct kvm_pic_state)); - spin_unlock(&pic_irqchip(kvm)->lock); + raw_spin_unlock(&pic_irqchip(kvm)->lock); break; case KVM_IRQCHIP_PIC_SLAVE: - spin_lock(&pic_irqchip(kvm)->lock); + raw_spin_lock(&pic_irqchip(kvm)->lock); memcpy(&pic_irqchip(kvm)->pics[1], &chip->chip.pic, sizeof(struct kvm_pic_state)); - spin_unlock(&pic_irqchip(kvm)->lock); + raw_spin_unlock(&pic_irqchip(kvm)->lock); break; case KVM_IRQCHIP_IOAPIC: r = kvm_set_ioapic(kvm, &chip->chip.ioapic); -- GitLab