Re: [PATCH 1/3] KVM: x86: hyper-v: don't crash on KVM_GET_SUPPORTED_HV_CPUID when kvm_intel.nested is disabled

2019-08-27 18:04+0200, Vitaly Kuznetsov:

If kvm_intel is loaded with nested=0 parameter an attempt to perform KVM_GET_SUPPORTED_HV_CPUID results in OOPS as nested_get_evmcs_version hook in kvm_x86_ops is NULL (we assign it in nested_vmx_hardware_setup() and this only happens in case nested is enabled).

Check that kvm_x86_ops->nested_get_evmcs_version is not NULL before calling it. With this, we can remove the stub from svm as it is no longer needed.

Added

Cc: stable@vger.kernel.org

Fixes: e2e871ab2f02 ("x86/kvm/hyper-v: Introduce nested_get_evmcs_version() helper") Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com

and applied, thanks.