Commit 2956a351 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Thomas Gleixner
Browse files

xen: allow some cr4 updates 



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

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 349c709f

arch/x86/xen/enlighten.c

+4 −2
Original line number Diff line number Diff line
@@ -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)