KVM: x86/mmu: Make HVA handler retpoline-friendly

When retpolines are enabled they have high overhead in the inner loop
inside kvm_handle_hva_range() that iterates over the provided memory area.

Let's mark this function and its TDP MMU equivalent __always_inline so
compiler will be able to change the call to the actual handler function
inside each of them into a direct one.

This significantly improves performance on the unmap test on the existing
kernel memslot code (tested on a Xeon 8167M machine):
30 slots in use:
Test       Before   After     Improvement
Unmap      0.0353s  0.0334s   5%
Unmap 2M   0.00104s 0.000407s 61%

509 slots in use:
Test       Before   After     Improvement
Unmap      0.0742s  0.0740s   None
Unmap 2M   0.00221s 0.00159s  28%

Looks like having an indirect call in these functions (and, so, a
retpoline) might have interfered with unrolling of the whole loop in the
CPU.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <732d3fe9eb68aa08402a638ab0309199fa89ae56.1612810129.git.maciej.szmigiero@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -1457,16 +1457,17 @@ static void slot_rmap_walk_next(struct slot_rmap_walk_iterator *iterator)
 	     slot_rmap_walk_okay(_iter_);				\
 	     slot_rmap_walk_next(_iter_))
 
-static int kvm_handle_hva_range(struct kvm *kvm,
-				unsigned long start,
-				unsigned long end,
-				unsigned long data,
-				int (*handler)(struct kvm *kvm,
-					       struct kvm_rmap_head *rmap_head,
-					       struct kvm_memory_slot *slot,
-					       gfn_t gfn,
-					       int level,
-					       unsigned long data))
+static __always_inline int
+kvm_handle_hva_range(struct kvm *kvm,
+		     unsigned long start,
+		     unsigned long end,
+		     unsigned long data,
+		     int (*handler)(struct kvm *kvm,
+				    struct kvm_rmap_head *rmap_head,
+				    struct kvm_memory_slot *slot,
+				    gfn_t gfn,
+				    int level,
+				    unsigned long data))
 {
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;

arch/x86/kvm/mmu/tdp_mmu.c

@@ -879,11 +879,17 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 	return ret;
 }
 
-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))
+static __always_inline 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))
 {
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;