KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped
... as a malicious userspace can run a toy guest to generate invalid
virtual-APIC page addresses in L1, i.e. flood the kernel log with error
messages.
Fixes: 690908104e39d ("KVM: nVMX: allow tests to use bad virtual-APIC page address") Cc: stable@vger.kernel.org Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>