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-rw-r--r--virt/kvm/ioapic.c78
1 files changed, 53 insertions, 25 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 1150c6d5c7b..9fe140bb38e 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -36,6 +36,7 @@
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/current.h>
+#include <trace/events/kvm.h>
#include "ioapic.h"
#include "lapic.h"
@@ -103,6 +104,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
{
unsigned index;
bool mask_before, mask_after;
+ union kvm_ioapic_redirect_entry *e;
switch (ioapic->ioregsel) {
case IOAPIC_REG_VERSION:
@@ -122,19 +124,20 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
ioapic_debug("change redir index %x val %x\n", index, val);
if (index >= IOAPIC_NUM_PINS)
return;
- mask_before = ioapic->redirtbl[index].fields.mask;
+ e = &ioapic->redirtbl[index];
+ mask_before = e->fields.mask;
if (ioapic->ioregsel & 1) {
- ioapic->redirtbl[index].bits &= 0xffffffff;
- ioapic->redirtbl[index].bits |= (u64) val << 32;
+ e->bits &= 0xffffffff;
+ e->bits |= (u64) val << 32;
} else {
- ioapic->redirtbl[index].bits &= ~0xffffffffULL;
- ioapic->redirtbl[index].bits |= (u32) val;
- ioapic->redirtbl[index].fields.remote_irr = 0;
+ e->bits &= ~0xffffffffULL;
+ e->bits |= (u32) val;
+ e->fields.remote_irr = 0;
}
- mask_after = ioapic->redirtbl[index].fields.mask;
+ mask_after = e->fields.mask;
if (mask_before != mask_after)
kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
- if (ioapic->redirtbl[index].fields.trig_mode == IOAPIC_LEVEL_TRIG
+ if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
&& ioapic->irr & (1 << index))
ioapic_service(ioapic, index);
break;
@@ -164,7 +167,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
/* Always delivery PIT interrupt to vcpu 0 */
if (irq == 0) {
irqe.dest_mode = 0; /* Physical mode. */
- irqe.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
+ /* need to read apic_id from apic regiest since
+ * it can be rewritten */
+ irqe.dest_id = ioapic->kvm->bsp_vcpu->vcpu_id;
}
#endif
return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
@@ -188,7 +193,10 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
if ((edge && old_irr != ioapic->irr) ||
(!edge && !entry.fields.remote_irr))
ret = ioapic_service(ioapic, irq);
+ else
+ ret = 0; /* report coalesced interrupt */
}
+ trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
}
return ret;
}
@@ -220,24 +228,29 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
__kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
}
-static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
- int len, int is_write)
+static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ return container_of(dev, struct kvm_ioapic, dev);
+}
+static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
+{
return ((addr >= ioapic->base_address &&
(addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
}
-static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
- void *val)
+static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
+ void *val)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ struct kvm_ioapic *ioapic = to_ioapic(this);
u32 result;
+ if (!ioapic_in_range(ioapic, addr))
+ return -EOPNOTSUPP;
ioapic_debug("addr %lx\n", (unsigned long)addr);
ASSERT(!(addr & 0xf)); /* check alignment */
+ mutex_lock(&ioapic->kvm->irq_lock);
addr &= 0xff;
switch (addr) {
case IOAPIC_REG_SELECT:
@@ -264,22 +277,28 @@ static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
default:
printk(KERN_WARNING "ioapic: wrong length %d\n", len);
}
+ mutex_unlock(&ioapic->kvm->irq_lock);
+ return 0;
}
-static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
- const void *val)
+static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
+ const void *val)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ struct kvm_ioapic *ioapic = to_ioapic(this);
u32 data;
+ if (!ioapic_in_range(ioapic, addr))
+ return -EOPNOTSUPP;
ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
(void*)addr, len, val);
ASSERT(!(addr & 0xf)); /* check alignment */
+
+ mutex_lock(&ioapic->kvm->irq_lock);
if (len == 4 || len == 8)
data = *(u32 *) val;
else {
printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
- return;
+ goto unlock;
}
addr &= 0xff;
@@ -300,6 +319,9 @@ static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
default:
break;
}
+unlock:
+ mutex_unlock(&ioapic->kvm->irq_lock);
+ return 0;
}
void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
@@ -314,21 +336,27 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
ioapic->id = 0;
}
+static const struct kvm_io_device_ops ioapic_mmio_ops = {
+ .read = ioapic_mmio_read,
+ .write = ioapic_mmio_write,
+};
+
int kvm_ioapic_init(struct kvm *kvm)
{
struct kvm_ioapic *ioapic;
+ int ret;
ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
if (!ioapic)
return -ENOMEM;
kvm->arch.vioapic = ioapic;
kvm_ioapic_reset(ioapic);
- ioapic->dev.read = ioapic_mmio_read;
- ioapic->dev.write = ioapic_mmio_write;
- ioapic->dev.in_range = ioapic_in_range;
- ioapic->dev.private = ioapic;
+ kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
ioapic->kvm = kvm;
- kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
- return 0;
+ ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &ioapic->dev);
+ if (ret < 0)
+ kfree(ioapic);
+
+ return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-24 18:32:06 +0000