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xen: don't bother trying to set cr4

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Xen ignores all updates to cr4, and some versions will kill the domain if
you try to change its value.  Just ignore all changes.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeremy Fitzhardinge 2007-09-18 22:46:33 -07:00 committed by Linus Torvalds
parent 248bdd5efc
commit 389a3c0249
1 changed files with 2 additions and 2 deletions
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arch/i386/xen/enlighten.c
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@ -623,8 +623,8 @@ static unsigned long xen_read_cr2_direct(void)
static void xen_write_cr4(unsigned long cr4) static void xen_write_cr4(unsigned long cr4)
{ {
/* never allow TSC to be disabled */ /* Just ignore cr4 changes; Xen doesn't allow us to do
native_write_cr4(cr4 & ~X86_CR4_TSD); anything anyway. */
} }
static unsigned long xen_read_cr3(void) static unsigned long xen_read_cr3(void)