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xen: allow some cr4 updates

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The guest can legitimately change things like cr4.OSFXSR and
OSXMMEXCPT, so let it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge 2008-05-26 23:31:04 +01:00 committed by Thomas Gleixner
parent 349c709f42
commit 2956a3511c
1 changed files with 4 additions and 2 deletions
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6
arch/x86/xen/enlighten.c
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@ -648,8 +648,10 @@ static unsigned long xen_read_cr2_direct(void)
static void xen_write_cr4(unsigned long cr4)
{
/* Just ignore cr4 changes; Xen doesn't allow us to do
anything anyway. */
cr4 &= ~X86_CR4_PGE;
cr4 &= ~X86_CR4_PSE;
native_write_cr4(cr4);
}
static unsigned long xen_read_cr3(void)