Re: [RFC PATCH v2 40/69] KVM: Export kvm_is_reserved_pfn() for use by TDX

[Paolo Bonzini]

On 03/07/21 00:04, isaku.yamahata@xxxxxxxxx wrote:
> From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
>
> TDX will use kvm_is_reserved_pfn() to prevent installing a reserved PFN
> int SEPT.  Or rather, to prevent such an attempt, as reserved PFNs are
> not covered by TDMRs.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> ---
>   virt/kvm/kvm_main.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 8b075b5e7303..dd6492b526c9 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -188,6 +188,7 @@ bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
>   
>   	return true;
>   }
> +EXPORT_SYMBOL_GPL(kvm_is_reserved_pfn);
>   
>   bool kvm_is_transparent_hugepage(kvm_pfn_t pfn)
>   {

As before, there's no problem in squashing this in the patch that 
introduces the use of kvm_is_reserved_pfn.  You could also move 
kvm_is_reserved_pfn and kvm_is_zone_device_pfn to a .h file.

Paolo