KVM: x86: Introduce __kvm_get_hypervisor_cpuid() helper

Similar to kvm_find_kvm_cpuid_features()/__kvm_find_kvm_cpuid_features(),
introduce a helper to search for the specific hypervisor signature in any
struct kvm_cpuid_entry2 array, not only in vcpu->arch.cpuid_entries.

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20240228101837.93642-2-vkuznets@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: vittyvk

arch/x86/kvm/cpuid.c

@@ -189,15 +189,15 @@ static int kvm_cpuid_check_equal(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2
 	return 0;
 }
 
-static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcpu,
-							    const char *sig)
+static struct kvm_hypervisor_cpuid __kvm_get_hypervisor_cpuid(struct kvm_cpuid_entry2 *entries,
+							      int nent, const char *sig)
 {
 	struct kvm_hypervisor_cpuid cpuid = {};
 	struct kvm_cpuid_entry2 *entry;
 	u32 base;
 
 	for_each_possible_hypervisor_cpuid_base(base) {
-		entry = kvm_find_cpuid_entry(vcpu, base);
+		entry = cpuid_entry2_find(entries, nent, base, KVM_CPUID_INDEX_NOT_SIGNIFICANT);
 
 		if (entry) {
 			u32 signature[3];
@@ -217,6 +217,13 @@ static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcp
 	return cpuid;
 }
 
+static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcpu,
+							    const char *sig)
+{
+	return __kvm_get_hypervisor_cpuid(vcpu->arch.cpuid_entries,
+					  vcpu->arch.cpuid_nent, sig);
+}
+
 static struct kvm_cpuid_entry2 *__kvm_find_kvm_cpuid_features(struct kvm_vcpu *vcpu,
 					      struct kvm_cpuid_entry2 *entries, int nent)
 {