Re: [PATCH 1/2] KVM: x86/mmu: Make HVA handler retpoline-friendly

From: Maciej S. Szmigiero
Date: Mon Feb 01 2021 - 10:21:25 EST


On 01.02.2021 09:21, Paolo Bonzini wrote:
On 01/02/21 09:13, Maciej S. Szmigiero wrote:
  static int kvm_handle_hva_range(struct kvm *kvm,
                  unsigned long start,
                  unsigned long end,
@@ -1495,8 +1534,9 @@ static int kvm_handle_hva_range(struct kvm *kvm,


-static int kvm_tdp_mmu_handle_hva_range(struct kvm *kvm, unsigned long start,
-        unsigned long end, unsigned long data,
-        int (*handler)(struct kvm *kvm, struct kvm_memory_slot *slot,
-                   struct kvm_mmu_page *root, gfn_t start,
-                   gfn_t end, unsigned long data))
-{

Can you look into just marking these functions __always_inline?  This should help the compiler change (*handler)(...) into a regular function call.

That looks even better - I see the compiler then turns the indirect call
into a direct one.

Will change to __always_inline instead of static dispatch in the next
version.
Thanks for the pointer.

Paolo


Maciej