x86/kvm/hyper-v: remove stale evmcs_already_enabled check from nested_enable_evmcs()

In nested_enable_evmcs() evmcs_already_enabled check doesn't really do
anything: controls are already sanitized and we return '0' regardless.
Just drop the check.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
index 7235970..89c3e0c 100644 (file)
--- a/arch/x86/kvm/vmx/evmcs.c
+++ b/arch/x86/kvm/vmx/evmcs.c
@@ -350,17 +350,12 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu,
                        uint16_t *vmcs_version)
 {
        struct vcpu_vmx *vmx = to_vmx(vcpu);
-       bool evmcs_already_enabled = vmx->nested.enlightened_vmcs_enabled;
 
        vmx->nested.enlightened_vmcs_enabled = true;
 
        if (vmcs_version)
                *vmcs_version = nested_get_evmcs_version(vcpu);
 
-       /* We don't support disabling the feature for simplicity. */
-       if (evmcs_already_enabled)
-               return 0;
-
        vmx->nested.msrs.pinbased_ctls_high &= ~EVMCS1_UNSUPPORTED_PINCTRL;
        vmx->nested.msrs.entry_ctls_high &= ~EVMCS1_UNSUPPORTED_VMENTRY_CTRL;
        vmx->nested.msrs.exit_ctls_high &= ~EVMCS1_UNSUPPORTED_VMEXIT_CTRL;