KVM: selftests: Use vCPU's CPUID directly in Hyper-V test

Use the vCPU's persistent CPUID array directly when manipulating the set
of exposed Hyper-V CPUID features.  Drop set_cpuid() to route all future
modification through the vCPU helpers; the Hyper-V features test was the
last user.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-27-seanjc@google.com

tools/testing/selftests/kvm/include/x86_64/processor.h

@@ -801,15 +801,6 @@ uint64_t vm_get_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu,
 void vm_set_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu,
 			     uint64_t vaddr, uint64_t pte);
 
-/*
- * set_cpuid() - overwrites a matching cpuid entry with the provided value.
- *		 matches based on ent->function && ent->index. returns true
- *		 if a match was found and successfully overwritten.
- * @cpuid: the kvm cpuid list to modify.
- * @ent: cpuid entry to insert
- */
-bool set_cpuid(struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 *ent);
-
 uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
 		       uint64_t a3);
 

tools/testing/selftests/kvm/lib/x86_64/processor.c

@@ -1224,24 +1224,6 @@ struct kvm_cpuid_entry2 *get_cpuid_entry(struct kvm_cpuid2 *cpuid,
 	return NULL;
 }
 
-bool set_cpuid(struct kvm_cpuid2 *cpuid,
-	       struct kvm_cpuid_entry2 *ent)
-{
-	int i;
-
-	for (i = 0; i < cpuid->nent; i++) {
-		struct kvm_cpuid_entry2 *cur = &cpuid->entries[i];
-
-		if (cur->function != ent->function || cur->index != ent->index)
-			continue;
-
-		memcpy(cur, ent, sizeof(struct kvm_cpuid_entry2));
-		return true;
-	}
-
-	return false;
-}
-
 uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
 		       uint64_t a3)
 {