* - Store the vCPU to the wakeup list, so when interrupts happen
* we can find the right vCPU to wake up.
* - Change the Posted-interrupt descriptor as below:
- * 'NDST' <-- vcpu->pre_pcpu
* 'NV' <-- POSTED_INTR_WAKEUP_VECTOR
* - If 'ON' is set during this process, which means at least one
* interrupt is posted for this vCPU, we cannot block it, in
*/
int pi_pre_block(struct kvm_vcpu *vcpu)
{
- unsigned int dest;
struct pi_desc old, new;
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
local_irq_disable();
vcpu->pre_pcpu = vcpu->cpu;
- spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
+ spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->cpu));
list_add_tail(&vcpu->blocked_vcpu_list,
- &per_cpu(blocked_vcpu_on_cpu, vcpu->pre_pcpu));
- spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
+ &per_cpu(blocked_vcpu_on_cpu, vcpu->cpu));
+ spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->cpu));
do {
old.control = new.control = pi_desc->control;
"Warning: SN field of posted-interrupts "
"is set before blocking\n");
- /*
- * Since vCPU can be preempted during this process,
- * vcpu->cpu could be different with pre_pcpu, we
- * need to set pre_pcpu as the destination of wakeup
- * notification event, then we can find the right vCPU
- * to wakeup in wakeup handler if interrupts happen
- * when the vCPU is in blocked state.
- */
- dest = cpu_physical_id(vcpu->pre_pcpu);
-
- if (x2apic_mode)
- new.ndst = dest;
- else
- new.ndst = (dest << 8) & 0xFF00;
-
/* set 'NV' to 'wakeup vector' */
new.nv = POSTED_INTR_WAKEUP_VECTOR;
} while (cmpxchg64(&pi_desc->control, old.control,