diff options
Diffstat (limited to 'arch/x86/kvm/i8259.c')
-rw-r--r-- | arch/x86/kvm/i8259.c | 72 |
1 files changed, 55 insertions, 17 deletions
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index d057c0c..93825ff 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -26,12 +26,36 @@ * Port from Qemu. */ #include <linux/mm.h> +#include <linux/slab.h> #include <linux/bitops.h> #include "irq.h" #include <linux/kvm_host.h> #include "trace.h" +static void pic_lock(struct kvm_pic *s) + __acquires(&s->lock) +{ + raw_spin_lock(&s->lock); +} + +static void pic_unlock(struct kvm_pic *s) + __releases(&s->lock) +{ + bool wakeup = s->wakeup_needed; + struct kvm_vcpu *vcpu; + + s->wakeup_needed = false; + + raw_spin_unlock(&s->lock); + + if (wakeup) { + vcpu = s->kvm->bsp_vcpu; + if (vcpu) + kvm_vcpu_kick(vcpu); + } +} + static void pic_clear_isr(struct kvm_kpic_state *s, int irq) { s->isr &= ~(1 << irq); @@ -44,18 +68,19 @@ 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); + pic_unlock(s->pics_state); kvm_notify_acked_irq(s->pics_state->kvm, SELECT_PIC(irq), irq); - spin_lock(&s->pics_state->lock); + pic_lock(s->pics_state); } void kvm_pic_clear_isr_ack(struct kvm *kvm) { struct kvm_pic *s = pic_irqchip(kvm); - spin_lock(&s->lock); + + pic_lock(s); s->pics[0].isr_ack = 0xff; s->pics[1].isr_ack = 0xff; - spin_unlock(&s->lock); + pic_unlock(s); } /* @@ -156,9 +181,9 @@ static void pic_update_irq(struct kvm_pic *s) void kvm_pic_update_irq(struct kvm_pic *s) { - spin_lock(&s->lock); + pic_lock(s); pic_update_irq(s); - spin_unlock(&s->lock); + pic_unlock(s); } int kvm_pic_set_irq(void *opaque, int irq, int level) @@ -166,14 +191,14 @@ int kvm_pic_set_irq(void *opaque, int irq, int level) struct kvm_pic *s = opaque; int ret = -1; - spin_lock(&s->lock); + pic_lock(s); 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); + pic_unlock(s); return ret; } @@ -203,7 +228,7 @@ int kvm_pic_read_irq(struct kvm *kvm) int irq, irq2, intno; struct kvm_pic *s = pic_irqchip(kvm); - spin_lock(&s->lock); + pic_lock(s); irq = pic_get_irq(&s->pics[0]); if (irq >= 0) { pic_intack(&s->pics[0], irq); @@ -228,7 +253,7 @@ int kvm_pic_read_irq(struct kvm *kvm) intno = s->pics[0].irq_base + irq; } pic_update_irq(s); - spin_unlock(&s->lock); + pic_unlock(s); return intno; } @@ -442,7 +467,7 @@ static int picdev_write(struct kvm_io_device *this, printk(KERN_ERR "PIC: non byte write\n"); return 0; } - spin_lock(&s->lock); + pic_lock(s); switch (addr) { case 0x20: case 0x21: @@ -455,7 +480,7 @@ static int picdev_write(struct kvm_io_device *this, elcr_ioport_write(&s->pics[addr & 1], addr, data); break; } - spin_unlock(&s->lock); + pic_unlock(s); return 0; } @@ -472,7 +497,7 @@ static int picdev_read(struct kvm_io_device *this, printk(KERN_ERR "PIC: non byte read\n"); return 0; } - spin_lock(&s->lock); + pic_lock(s); switch (addr) { case 0x20: case 0x21: @@ -486,7 +511,7 @@ static int picdev_read(struct kvm_io_device *this, break; } *(unsigned char *)val = data; - spin_unlock(&s->lock); + pic_unlock(s); return 0; } @@ -503,7 +528,7 @@ static void pic_irq_request(void *opaque, int level) s->output = level; if (vcpu && level && (s->pics[0].isr_ack & (1 << irq))) { s->pics[0].isr_ack &= ~(1 << irq); - kvm_vcpu_kick(vcpu); + s->wakeup_needed = true; } } @@ -520,7 +545,7 @@ 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; @@ -533,7 +558,9 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm) * Initialize PIO device */ kvm_iodevice_init(&s->dev, &picdev_ops); - ret = kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &s->dev); + mutex_lock(&kvm->slots_lock); + ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, &s->dev); + mutex_unlock(&kvm->slots_lock); if (ret < 0) { kfree(s); return NULL; @@ -541,3 +568,14 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm) return s; } + +void kvm_destroy_pic(struct kvm *kvm) +{ + struct kvm_pic *vpic = kvm->arch.vpic; + + if (vpic) { + kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &vpic->dev); + kvm->arch.vpic = NULL; + kfree(vpic); + } +} |