KVM: Fix guest cr4 corruption

Upon entry to protected mode, we set cr4 to a value derived from cr0 accidentally. Fix.

This could cause a guest to crash (though I never observed it).

Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
@@ -697,7 +697,7 @@ static void enter_pmode(struct kvm_vcpu 
 	vmcs_writel(GUEST_RFLAGS, flags);
 
 	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~CR4_VME_MASK) |
-			(vmcs_readl(CR0_READ_SHADOW) & CR4_VME_MASK) );
+			(vmcs_readl(CR4_READ_SHADOW) & CR4_VME_MASK));
 
 	update_exception_bitmap(vcpu);
 

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