Subject: Re: [PATCH 1/4] KVM: PPC: BOOK3S: PR: Emulate virtual timebase register

From: Alexander Graf <[email-masked]>
Date: Fri, 06 Jun 2014 12:44:19 +0200

On 05.06.14 14:08, Aneesh Kumar K.V wrote:
> virtual time base register is a per VM, per cpu register that needs
> to be saved and restored on vm exit and entry. Writing to VTB is not
> allowed in the privileged mode.
>
> Signed-off-by: Aneesh Kumar K.V <[email-masked]>

For some reason BUG() doesn't always trigger the "execution stops here" 
logic in gcc. So I've squashed this patch into yours.

Alex

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 3e7085d..99de6ad 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1206,6 +1206,7 @@ static inline unsigned long mfvtb (void)
       * capture that.
       */
      BUG();
+    return 0;
  }

  #ifdef __powerpc64__