[PATCH 4/24] Allow setting the VMXE bit in CR4

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This patch allows the guest to enable the VMXE bit in CR4, which is a
prerequisite to running VMXON.

Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
--- .before/arch/x86/kvm/x86.c	2010-06-13 15:01:28.000000000 +0300
+++ .after/arch/x86/kvm/x86.c	2010-06-13 15:01:28.000000000 +0300
@@ -501,7 +501,7 @@ int __kvm_set_cr4(struct kvm_vcpu *vcpu,
 		   && !load_pdptrs(vcpu, vcpu->arch.cr3))
 		return 1;
 
-	if (cr4 & X86_CR4_VMXE)
+	if (cr4 & X86_CR4_VMXE && !nested)
 		return 1;
 
 	kvm_x86_ops->set_cr4(vcpu, cr4);
--
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