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KVM: nVMX: WARN on attempt to switch the currently loaded VMCS

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WARN if KVM attempts to switch to the currently loaded VMCS.  Now that
nested_vmx_free_vcpu() doesn't blindly call vmx_switch_vmcs(), all paths
that lead to vmx_switch_vmcs() are implicitly guarded by guest vs. host
mode, e.g. KVM should never emulate VMX instructions when guest mode is
active, and nested_vmx_vmexit() should never be called when host mode is
active.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923184452.980-8-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-09-23 11:44:52 -07:00 committed by Paolo Bonzini
parent ebec153a05
commit 138534a810
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/vmx/nested.c
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@ -258,7 +258,7 @@ static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
struct loaded_vmcs *prev;
int cpu;
if (vmx->loaded_vmcs == vmcs)
if (WARN_ON_ONCE(vmx->loaded_vmcs == vmcs))
return;
cpu = get_cpu();