On Thu, Mar 13, 2025, Jon Kohler wrote:
> From: Mickaël Salaün <mic@xxxxxxxxxxx>
>
> Add 'cpu_has_vmx_mbec' helper to determine whether the cpu based VMCS
> from hardware has Intel Mode Based Execution Control exposed, which is
> secondary execution control bit 22.
>
> Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
> Co-developed-by: Jon Kohler <jon@xxxxxxxxxxx>
> Signed-off-by: Jon Kohler <jon@xxxxxxxxxxx>
LOL, really? There's a joke in here about how many SWEs it takes...
> ---
> arch/x86/kvm/vmx/capabilities.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
> index cb6588238f46..f83592272920 100644
> --- a/arch/x86/kvm/vmx/capabilities.h
> +++ b/arch/x86/kvm/vmx/capabilities.h
> @@ -253,6 +253,12 @@ static inline bool cpu_has_vmx_xsaves(void)
> SECONDARY_EXEC_ENABLE_XSAVES;
> }
>
> +static inline bool cpu_has_vmx_mbec(void)
> +{
> + return vmcs_config.cpu_based_2nd_exec_ctrl &
> + SECONDARY_EXEC_MODE_BASED_EPT_EXEC;
> +}
This absolutely doesn't warrant its own patch. Introduce it whenever its first
used/needed.
> +
> static inline bool cpu_has_vmx_waitpkg(void)
> {
> return vmcs_config.cpu_based_2nd_exec_ctrl &
> --
> 2.43.0
>
