Re: 2.6.35-rc1 regression with pvclock and smp guests

[Avi Kivity <avi@redhat.com>]

  On 07/27/2010 02:49 PM, Andre Przywara wrote:
>
>> What is the guest executing when it hangs?
> Both VCPUs are halted, the monitor and System.map tell me it's in 
> native_safe_halt().
> The code sequence confirms this, it is an intentional sti;hlt condition.
> Using -smp 16 also shows that all 16 VCPUs are stuck.
>

Well, strange.  The intent of that patch was to make the clock never go 
backwards.  Perhaps the change made it go forwards by a large amount, 
and the guest is not hung, just waiting for some timer that is far in 
the future.

Can you do something like

-      if (ret < last)
+      if (ret < last) {
+            static u64 max_delta;
+            if (last - ret > max_delta) {
+                  max_delta = last - ret;
+                  printk("advancing kvmclock by: %llx\n", max_delta);
+            }
              return last;
+      }

to see if this is happening?

-- 
error compiling committee.c: too many arguments to function