[PATCH 05/12] KVM: nVMX: Leave VMX mode on clearing of feature control MSR

[Jan Kiszka <jan.kiszka@web.de>]

From: Jan Kiszka <jan.kiszka@siemens.com>

When userspace sets MSR_IA32_FEATURE_CONTROL to 0, make sure we leave
root and non-root mode, fully disabling VMX. The register state of the
VCPU is undefined after this step, so userspace has to set it to a
proper state afterward.

This enables to reboot a VM while it is running some hypervisor code.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 arch/x86/kvm/vmx.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9fa8a1c..3edf08f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2455,6 +2455,8 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 	return 1;
 }
 
+static void vmx_leave_nested(struct kvm_vcpu *vcpu);
+
 static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 {
 	u32 msr_index = msr_info->index;
@@ -2470,6 +2472,8 @@ static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 				& FEATURE_CONTROL_LOCKED)
 			return 0;
 		to_vmx(vcpu)->nested.msr_ia32_feature_control = data;
+		if (host_initialized && data == 0)
+			vmx_leave_nested(vcpu);
 		return 1;
 	}
 
@@ -8507,6 +8511,16 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu)
 }
 
 /*
+ * Forcibly leave nested mode in order to be able to reset the VCPU later on.
+ */
+static void vmx_leave_nested(struct kvm_vcpu *vcpu)
+{
+	if (is_guest_mode(vcpu))
+		nested_vmx_vmexit(vcpu);
+	free_nested(to_vmx(vcpu));
+}
+
+/*
  * L1's failure to enter L2 is a subset of a normal exit, as explained in
  * 23.7 "VM-entry failures during or after loading guest state" (this also
  * lists the acceptable exit-reason and exit-qualification parameters).
-- 
1.8.1.1.298.ge7eed54