xen/x86: Don't try to set PCE bit in CR4

Since VPMU code emulates RDPMC instruction with RDMSR and because hypervisor
does not emulate it there is no reason to try setting CR4's PCE bit (and the
hypervisor will warn on seeing it set).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
(cherry picked from commit 3375d8284dfb7866f261ec008d15d30999ff273b)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 6f0e7c98bd3abcdda2c7b438e4c83d7f33ca7f6f..f429a405f9f47560f5e83b121521d5f4b639efde 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -982,8 +982,7 @@ static void xen_write_cr0(unsigned long cr0)
 
 static void xen_write_cr4(unsigned long cr4)
 {
-       cr4 &= ~X86_CR4_PGE;
-       cr4 &= ~X86_CR4_PSE;
+       cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
 
        native_write_cr4(cr4);
 }