Re: [PATCH 2/5] Paravirt cpu batching.patch

Chuck Ebbert wrote:

In-Reply-To: [ref]

On Tue, 12 Dec 2006 14:54:30 -0800, Chros Wright wrote:

  

quoted

quoted

--- a/arch/i386/kernel/process.c    Tue Dec 12 13:50:50 2006 -0800
+++ b/arch/i386/kernel/process.c    Tue Dec 12 13:50:53 2006 -0800

@@ -665,6 +665,37 @@ struct task_struct fastcall * __switch_t
    load_TLS(next, cpu);
 
    /*
+    * Restore IOPL if needed.
+    */
+   if (unlikely(prev->iopl != next->iopl))
+           set_iopl_mask(next->iopl);
      

Small sidenote that this bit undoes a recent change from Chuck Ebbert, which
killed iopl_mask update via hypervisor.
    

This whole thing needs a proper fix IMO.  I posted something a while back
but Andi didn't like it, I guess.
  

We can handle this one with an #ifdef CONFIG_PARAVIRT, though.

Zach