> On 2 Jul 2019, at 18:04, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
> Allow userspace to set a custom value for the VMFUNC controls MSR, as long
> as the capabilities it advertises do not exceed those of the host.
>
> Fixes: 27c42a1bb ("KVM: nVMX: Enable VMFUNC for the L1 hypervisor", 2017-08-03)
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Reviewed-by: Liran Alon <liran.alon@xxxxxxxxxx>
> ---
> arch/x86/kvm/vmx/nested.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index c4e29ef0b21e..163d226efa96 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -1234,6 +1234,11 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
> case MSR_IA32_VMX_VMCS_ENUM:
> vmx->nested.msrs.vmcs_enum = data;
> return 0;
> + case MSR_IA32_VMX_VMFUNC:
> + if (data & ~vmx->nested.msrs.vmfunc_controls)
> + return -EINVAL;
> + vmx->nested.msrs.vmfunc_controls = data;
> + return 0;
> default:
> /*
> * The rest of the VMX capability MSRs do not support restore.
> --
> 1.8.3.1
>
>
