KVM: Convert PIC lock from raw spinlock to ordinary spinlock

The PIC code used to be called from preempt_disable() context, which
wasn't very good for PREEMPT_RT.  That is no longer the case, so move
back from raw_spinlock_t to spinlock_t.

Signed-off-by: Avi Kivity <avi@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index ab1bb8f..dd54c5b 100644 (file)
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -39,7 +39,7 @@ static void pic_irq_request(struct kvm *kvm, int level);
 static void pic_lock(struct kvm_pic *s)
        __acquires(&s->lock)
 {
-       raw_spin_lock(&s->lock);
+       spin_lock(&s->lock);
 }
 
 static void pic_unlock(struct kvm_pic *s)
@@ -51,7 +51,7 @@ static void pic_unlock(struct kvm_pic *s)
 
        s->wakeup_needed = false;
 
-       raw_spin_unlock(&s->lock);
+       spin_unlock(&s->lock);
 
        if (wakeup) {
                kvm_for_each_vcpu(i, vcpu, s->kvm) {
@@ -569,7 +569,7 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
        s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL);
        if (!s)
                return NULL;
-       raw_spin_lock_init(&s->lock);
+       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 63c3145..ba910d1 100644 (file)
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -60,7 +60,7 @@ struct kvm_kpic_state {
 };
 
 struct kvm_pic {
-       raw_spinlock_t lock;
+       spinlock_t lock;
        bool wakeup_needed;
        unsigned pending_acks;
        struct kvm *kvm;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0b021e1..3adf692 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3011,18 +3011,18 @@ 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:
-               raw_spin_lock(&pic_irqchip(kvm)->lock);
+               spin_lock(&pic_irqchip(kvm)->lock);
                memcpy(&pic_irqchip(kvm)->pics[0],
                        &chip->chip.pic,
                        sizeof(struct kvm_pic_state));
-               raw_spin_unlock(&pic_irqchip(kvm)->lock);
+               spin_unlock(&pic_irqchip(kvm)->lock);
                break;
        case KVM_IRQCHIP_PIC_SLAVE:
-               raw_spin_lock(&pic_irqchip(kvm)->lock);
+               spin_lock(&pic_irqchip(kvm)->lock);
                memcpy(&pic_irqchip(kvm)->pics[1],
                        &chip->chip.pic,
                        sizeof(struct kvm_pic_state));
-               raw_spin_unlock(&pic_irqchip(kvm)->lock);
+               spin_unlock(&pic_irqchip(kvm)->lock);
                break;
        case KVM_IRQCHIP_IOAPIC:
                r = kvm_set_ioapic(kvm, &chip->chip.ioapic);