[PATCH] KVM: nVMX: Reset vmxon_ptr upon VMXOFF emulation.

[Yu Zhang]

From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

Currently, 'vmx->nested.vmxon_ptr' is not reset upon VMXOFF
emulation. This is not a problem per se as we never access
it when !vmx->nested.vmxon. But this should be done to avoid
any issue in the future.

Also, initialize the vmxon_ptr when vcpu is created.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
---
 arch/x86/kvm/vmx/nested.c | 1 +
 arch/x86/kvm/vmx/vmx.c    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 90f34f12f883..e4260f67caac 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -289,6 +289,7 @@ static void free_nested(struct kvm_vcpu *vcpu)
 	kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 
 	vmx->nested.vmxon = false;
+	vmx->nested.vmxon_ptr = -1ull;
 	vmx->nested.smm.vmxon = false;
 	free_vpid(vmx->nested.vpid02);
 	vmx->nested.posted_intr_nv = -1;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 0c2c0d5ae873..9a3e35c038f2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6886,6 +6886,7 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
 
 	vcpu_setup_sgx_lepubkeyhash(vcpu);
 
+	vmx->nested.vmxon_ptr = -1ull;
 	vmx->nested.posted_intr_nv = -1;
 	vmx->nested.current_vmptr = -1ull;
 	vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
-- 
2.17.1