[patch] Patch accepted in Debian and Redhat

enable-detect-in-kvm.diff (text/plain), 772 bytes, created by Faustus on 2012-07-11 11:59:50 UTC

Subject: Not calling iopl() is triggering an undesired SEGV
References: bnc#604966

  Reverts the following upstream commit:

  commit bcdec3d0cd4434770cd841c33c030e0d7203881f
  Author: Philip Langdale <[e-mail]>
  Date:   Thu Oct 23 23:35:28 2008 -0700

    Remove call to iopl(). It's not portable and isn't necessary.

diff --git a/tools/vmmouse_detect.c b/tools/vmmouse_detect.c
index e5f14a3..0dd4827 100644
--- a/tools/vmmouse_detect.c
+++ b/tools/vmmouse_detect.c
@@ -47,6 +47,11 @@ main(void)
    signal(SIGSEGV, segvCB);
 
 #if defined __i386__ || defined __x86_64__ 
+   /*
+    * To access i/o ports above 0x3ff, we need to be in iopl(3).
+    */
+
+   iopl(3);
    if (VMMouseClient_Enable()) {
       VMMouseClient_Disable();
       return 0;