On 23/09/20 18:50, Sean Christopherson wrote:
> Add a helper function and several wrapping macros to consolidate the
> copy-paste code in vmx_compute_secondary_exec_control() for adjusting
> controls that are dependent on guest CPUID bits.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> ---
> arch/x86/kvm/vmx/vmx.c | 128 +++++++++++++----------------------------
> 1 file changed, 41 insertions(+), 87 deletions(-)
The diffstat is enticing but the code a little less so... Can you just
add documentation above vmx_adjust_secondary_exec_control that explains
the how/why?
Paolo
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 5180529f6531..b786cfb74f4f 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4073,6 +4073,38 @@ u32 vmx_exec_control(struct vcpu_vmx *vmx)
> }
>
>
> +static inline void
> +vmx_adjust_secondary_exec_control(struct vcpu_vmx *vmx, u32 *exec_control,
> + u32 control, bool enabled, bool exiting)
> +{
> + if (enabled == exiting)
> + *exec_control &= ~control;
> + if (nested) {
> + if (enabled)
> + vmx->nested.msrs.secondary_ctls_high |= control;
> + else
> + vmx->nested.msrs.secondary_ctls_high &= ~control;
> + }
> +}
> +
> +#define vmx_adjust_sec_exec_control(vmx, exec_control, name, feat_name, ctrl_name, exiting) \
> +({ \
> + bool __enabled; \
> + \
> + if (cpu_has_vmx_##name()) { \
> + __enabled = guest_cpuid_has(&(vmx)->vcpu, \
> + X86_FEATURE_##feat_name); \
> + vmx_adjust_secondary_exec_control(vmx, exec_control, \
> + SECONDARY_EXEC_##ctrl_name, __enabled, exiting); \
> + } \
> +})
> +
> +#define vmx_adjust_sec_exec_feature(vmx, exec_control, lname, uname) \
> + vmx_adjust_sec_exec_control(vmx, exec_control, lname, uname, ENABLE_##uname, false)
> +
> +#define vmx_adjust_sec_exec_exiting(vmx, exec_control, lname, uname) \
> + vmx_adjust_sec_exec_control(vmx, exec_control, lname, uname, uname##_EXITING, true)
> +
> static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
> {
