diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/intc/ioapic.c | 57 | ||||
| -rw-r--r-- | hw/intc/trace-events | 1 |
2 files changed, 53 insertions, 5 deletions
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c index 9d75f84d3b..7074489fdf 100644 --- a/hw/intc/ioapic.c +++ b/hw/intc/ioapic.c @@ -139,6 +139,15 @@ static void ioapic_service(IOAPICCommonState *s) } } +#define SUCCESSIVE_IRQ_MAX_COUNT 10000 + +static void delayed_ioapic_service_cb(void *opaque) +{ + IOAPICCommonState *s = opaque; + + ioapic_service(s); +} + static void ioapic_set_irq(void *opaque, int vector, int level) { IOAPICCommonState *s = opaque; @@ -222,13 +231,39 @@ void ioapic_eoi_broadcast(int vector) } for (n = 0; n < IOAPIC_NUM_PINS; n++) { entry = s->ioredtbl[n]; - if ((entry & IOAPIC_LVT_REMOTE_IRR) - && (entry & IOAPIC_VECTOR_MASK) == vector) { - trace_ioapic_clear_remote_irr(n, vector); - s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR; - if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) { + + if ((entry & IOAPIC_VECTOR_MASK) != vector || + ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) != IOAPIC_TRIGGER_LEVEL) { + continue; + } + + if (!(entry & IOAPIC_LVT_REMOTE_IRR)) { + continue; + } + + trace_ioapic_clear_remote_irr(n, vector); + s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR; + + if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) { + ++s->irq_eoi[vector]; + if (s->irq_eoi[vector] >= SUCCESSIVE_IRQ_MAX_COUNT) { + /* + * Real hardware does not deliver the interrupt immediately + * during eoi broadcast, and this lets a buggy guest make + * slow progress even if it does not correctly handle a + * level-triggered interrupt. Emulate this behavior if we + * detect an interrupt storm. + */ + s->irq_eoi[vector] = 0; + timer_mod_anticipate(s->delayed_ioapic_service_timer, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + + NANOSECONDS_PER_SECOND / 100); + trace_ioapic_eoi_delayed_reassert(vector); + } else { ioapic_service(s); } + } else { + s->irq_eoi[vector] = 0; } } } @@ -401,6 +436,9 @@ static void ioapic_realize(DeviceState *dev, Error **errp) memory_region_init_io(&s->io_memory, OBJECT(s), &ioapic_io_ops, s, "ioapic", 0x1000); + s->delayed_ioapic_service_timer = + timer_new_ns(QEMU_CLOCK_VIRTUAL, delayed_ioapic_service_cb, s); + qdev_init_gpio_in(dev, ioapic_set_irq, IOAPIC_NUM_PINS); ioapics[ioapic_no] = s; @@ -408,6 +446,14 @@ static void ioapic_realize(DeviceState *dev, Error **errp) qemu_add_machine_init_done_notifier(&s->machine_done); } +static void ioapic_unrealize(DeviceState *dev, Error **errp) +{ + IOAPICCommonState *s = IOAPIC_COMMON(dev); + + timer_del(s->delayed_ioapic_service_timer); + timer_free(s->delayed_ioapic_service_timer); +} + static Property ioapic_properties[] = { DEFINE_PROP_UINT8("version", IOAPICCommonState, version, IOAPIC_VER_DEF), DEFINE_PROP_END_OF_LIST(), @@ -419,6 +465,7 @@ static void ioapic_class_init(ObjectClass *klass, void *data) DeviceClass *dc = DEVICE_CLASS(klass); k->realize = ioapic_realize; + k->unrealize = ioapic_unrealize; /* * If APIC is in kernel, we need to update the kernel cache after * migration, otherwise first 24 gsi routes will be invalid. diff --git a/hw/intc/trace-events b/hw/intc/trace-events index a28bdce925..90c9d07c1a 100644 --- a/hw/intc/trace-events +++ b/hw/intc/trace-events @@ -25,6 +25,7 @@ apic_mem_writel(uint64_t addr, uint32_t val) "0x%"PRIx64" = 0x%08x" ioapic_set_remote_irr(int n) "set remote irr for pin %d" ioapic_clear_remote_irr(int n, int vector) "clear remote irr for pin %d vector %d" ioapic_eoi_broadcast(int vector) "EOI broadcast for vector %d" +ioapic_eoi_delayed_reassert(int vector) "delayed reassert on EOI broadcast for vector %d" ioapic_mem_read(uint8_t addr, uint8_t regsel, uint8_t size, uint32_t val) "ioapic mem read addr 0x%"PRIx8" regsel: 0x%"PRIx8" size 0x%"PRIx8" retval 0x%"PRIx32 ioapic_mem_write(uint8_t addr, uint8_t regsel, uint8_t size, uint32_t val) "ioapic mem write addr 0x%"PRIx8" regsel: 0x%"PRIx8" size 0x%"PRIx8" val 0x%"PRIx32 ioapic_set_irq(int vector, int level) "vector: %d level: %d" |