On 2014-09-11 07:06, Zhang Haoyu wrote:
Currently, we call ioapic_service() immediately when we find the irq is still
active during eoi broadcast. But for real hardware, there's some dealy between
the EOI writing and irq delivery (system bus latency?). So we need to emulate
this behavior.
Subject: [Qemu-devel] [PATCH] kvm: ioapic: conditionally delay irq delivery
duringeoi broadcast
Currently, we call ioapic_service() immediately when we find the irq is still
active during eoi broadcast. But for real hardware, there's some dealy
between
the EOI writing and irq delivery
Currently, we call ioapic_service() immediately when we find the irq is still
active during eoi broadcast. But for real hardware, there's some dealy between
the EOI writing and irq delivery (system bus latency?). So we need to emulate
this behavior. Otherwise, for a guest who haven't register a
+static void kvm_ioapic_eoi_inject_work(struct work_struct *work)
+{
+ int i, ret;
+ struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic,
+ eoi_inject.work);
+ spin_lock(ioapic-lock);
+ for (i = 0; i IOAPIC_NUM_PINS;
Currently, we call ioapic_service() immediately when we find the irq is still
active during eoi broadcast. But for real hardware, there's some dealy between
the EOI writing and irq delivery (system bus latency?). So we need to emulate
this behavior. Otherwise, for a guest who haven't register a
