[Xen-devel] HT support on VMX broken

[Leendert van Doorn <leendert@xxxxxxxxxxxxxx>]

Hyperthreading on VMX is broken in the xeno-unstable.bk tree. The diff
below fixes this.

It turns out that the mtrr code clears too many bits, some of them cause
Xen to crash. Being a bit more precise fixes the problem.

        Leendert

--- generic.c.orig      2005-01-03 23:44:18.000000000 -0500
+++ generic.c   2005-01-05 14:57:16.840893000 -0500
@@ -250,7 +250,7 @@
        /*  Save value of CR4 and clear Page Global Enable (bit 7)  */
        if ( cpu_has_pge ) {
                cr4 = read_cr4();
-               write_cr4(cr4 & (unsigned char) ~(1 << 7));
+               write_cr4(cr4 & ~X86_CR4_PGE);
        }
 
        /* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */



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