Wait for right amount of tlb flushes. Completed can be larger than
needed and therefore the loop waiting them to match never ends.
Signed-off-by: Marko Kohtala <[EMAIL PROTECTED]>
---
This solves kernel lockup in KVM_SET_MEMORY_REGION ioctl with Linux
2.6.23.8 and before at kvm-52 start. Not needed in 2.6.24.
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index cd05579..b148aff 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -279,7 +279,8 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
* to complete.
*/
for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
- smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
+ if (cpu_isset(cpu, cpus))
+ smp_call_function_single(cpu, ack_flush, &completed, 1,
0);
while (atomic_read(&completed) != needed) {
cpu_relax();
barrier();
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