KVM: nVMX: WARN if nested run hits VMFail with early consistency checks enabled

When early consistency checks are enabled, all VMFail conditions
should be caught by nested_vmx_check_vmentry_hw().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fb4a869..c255686 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -13581,14 +13581,6 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
        /* trying to cancel vmlaunch/vmresume is a bug */
        WARN_ON_ONCE(vmx->nested.nested_run_pending);
 
-       /*
-        * The only expected VM-instruction error is "VM entry with
-        * invalid control field(s)." Anything else indicates a
-        * problem with L0.
-        */
-       WARN_ON_ONCE(vmx->fail && (vmcs_read32(VM_INSTRUCTION_ERROR) !=
-                                  VMXERR_ENTRY_INVALID_CONTROL_FIELD));
-
        leave_guest_mode(vcpu);
 
        if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
@@ -13615,6 +13607,16 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
                if (nested_vmx_store_msr(vcpu, vmcs12->vm_exit_msr_store_addr,
                                         vmcs12->vm_exit_msr_store_count))
                        nested_vmx_abort(vcpu, VMX_ABORT_SAVE_GUEST_MSR_FAIL);
+       } else {
+               /*
+                * The only expected VM-instruction error is "VM entry with
+                * invalid control field(s)." Anything else indicates a
+                * problem with L0.  And we should never get here with a
+                * VMFail of any type if early consistency checks are enabled.
+                */
+               WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) !=
+                            VMXERR_ENTRY_INVALID_CONTROL_FIELD);
+               WARN_ON_ONCE(nested_early_check);
        }
 
        vmx_switch_vmcs(vcpu, &vmx->vmcs01);