Re: [PATCH v9 19/22] KVM: nVMX: Handle FRED VMCS fields in nested VMX context

[Sean Christopherson]

On Sun, Oct 26, 2025, Xin Li (Intel) wrote:
> diff --git a/arch/x86/kvm/vmx/vmcs_shadow_fields.h b/arch/x86/kvm/vmx/vmcs_shadow_fields.h
> index cad128d1657b..da338327c2b3 100644
> --- a/arch/x86/kvm/vmx/vmcs_shadow_fields.h
> +++ b/arch/x86/kvm/vmx/vmcs_shadow_fields.h
> @@ -74,6 +74,10 @@ SHADOW_FIELD_RW(HOST_GS_BASE, host_gs_base)
>  /* 64-bit */
>  SHADOW_FIELD_RO(GUEST_PHYSICAL_ADDRESS, guest_physical_address)
>  SHADOW_FIELD_RO(GUEST_PHYSICAL_ADDRESS_HIGH, guest_physical_address)
> +SHADOW_FIELD_RO(ORIGINAL_EVENT_DATA, original_event_data)
> +SHADOW_FIELD_RO(ORIGINAL_EVENT_DATA_HIGH, original_event_data)
> +SHADOW_FIELD_RW(INJECTED_EVENT_DATA, injected_event_data)
> +SHADOW_FIELD_RW(INJECTED_EVENT_DATA_HIGH, injected_event_data)

Please add shadow fields in a separate patch, with sufficient explain to justify
why KVM needs to enable VMCS shadowing for the fields (it's purely a performance
optimazation).