[PATCH 4/7] KVM: nVMX: Move the checks for VM-Exit Control Fields to a separate helper function

[Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>]

.. to improve readability and maintainability, and to align the code as per
the layout of the checks in chapter "VM Entries" in Intel SDM vol 3C.

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Reviewed-by: Mihai Carabas <mihai.carabas@xxxxxxxxxx>
Reviewed-by: Mark Kanda <mark.kanda@xxxxxxxxxx>
---
 arch/x86/kvm/vmx.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 26b05d7..c015dff 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -11740,14 +11740,21 @@ static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-static int nested_vmx_check_msr_switch_controls(struct kvm_vcpu *vcpu,
+static int nested_vmx_check_exit_msr_switch_controls(struct kvm_vcpu *vcpu,
 						struct vmcs12 *vmcs12)
 {
 	if (nested_vmx_check_msr_switch(vcpu, vmcs12->vm_exit_msr_load_count,
 					vmcs12->vm_exit_msr_load_addr) ||
 	    nested_vmx_check_msr_switch(vcpu, vmcs12->vm_exit_msr_store_count,
-					vmcs12->vm_exit_msr_store_addr) ||
-	    nested_vmx_check_msr_switch(vcpu, vmcs12->vm_entry_msr_load_count,
+					vmcs12->vm_exit_msr_store_addr))
+		return -EINVAL;
+	return 0;
+}
+
+static int nested_vmx_check_msr_switch_controls(struct kvm_vcpu *vcpu,
+						struct vmcs12 *vmcs12)
+{
+	if (nested_vmx_check_msr_switch(vcpu, vmcs12->vm_entry_msr_load_count,
 					vmcs12->vm_entry_msr_load_addr))
 		return -EINVAL;
 
@@ -12418,13 +12425,26 @@ static int nested_check_vm_execution_controls(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
+/*
+ * Checks related to VM-Exit Control Fields
+ */
+static int nested_check_vm_exit_controls(struct kvm_vcpu *vcpu,
+					 struct vmcs12 *vmcs12)
+{
+	if (nested_vmx_check_exit_msr_switch_controls(vcpu, vmcs12))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int nested_check_vmentry_prereqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 {
 	if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
 	    vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT)
 		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
 
-	if (nested_check_vm_execution_controls(vcpu, vmcs12))
+	if (nested_check_vm_execution_controls(vcpu, vmcs12) ||
+	    nested_check_vm_exit_controls(vcpu, vmcs12))
 		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
 
 	if (nested_vmx_check_msr_switch_controls(vcpu, vmcs12))
-- 
2.9.5