[RFC PATCH v2 07/10] KVM: x86: SVM: move avic state to separate struct

[Maxim Levitsky <mlevitsk@redhat.com>]

This will make the code a bit easier to read when nested AVIC support
is added.

No functional change intended.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 arch/x86/kvm/svm/avic.c | 49 +++++++++++++++++++++++------------------
 arch/x86/kvm/svm/svm.h  | 14 +++++++-----
 2 files changed, 36 insertions(+), 27 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index f375ca1d6518e..87756237c646d 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -69,6 +69,8 @@ int avic_ga_log_notifier(u32 ga_tag)
 	unsigned long flags;
 	struct kvm_svm *kvm_svm;
 	struct kvm_vcpu *vcpu = NULL;
+	struct kvm_svm_avic *avic;
+
 	u32 vm_id = AVIC_GATAG_TO_VMID(ga_tag);
 	u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
 
@@ -76,9 +78,13 @@ int avic_ga_log_notifier(u32 ga_tag)
 	trace_kvm_avic_ga_log(vm_id, vcpu_id);
 
 	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
-	hash_for_each_possible(svm_vm_data_hash, kvm_svm, hnode, vm_id) {
-		if (kvm_svm->avic_vm_id != vm_id)
+	hash_for_each_possible(svm_vm_data_hash, avic, hnode, vm_id) {
+
+
+		if (avic->vm_id != vm_id)
 			continue;
+
+		kvm_svm = container_of(avic, struct kvm_svm, avic);
 		vcpu = kvm_get_vcpu_by_id(&kvm_svm->kvm, vcpu_id);
 		break;
 	}
@@ -98,18 +104,18 @@ int avic_ga_log_notifier(u32 ga_tag)
 void avic_vm_destroy(struct kvm *kvm)
 {
 	unsigned long flags;
-	struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
+	struct kvm_svm_avic *avic = &to_kvm_svm(kvm)->avic;
 
 	if (!enable_apicv)
 		return;
 
-	if (kvm_svm->avic_logical_id_table_page)
-		__free_page(kvm_svm->avic_logical_id_table_page);
-	if (kvm_svm->avic_physical_id_table_page)
-		__free_page(kvm_svm->avic_physical_id_table_page);
+	if (avic->logical_id_table_page)
+		__free_page(avic->logical_id_table_page);
+	if (avic->physical_id_table_page)
+		__free_page(avic->physical_id_table_page);
 
 	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
-	hash_del(&kvm_svm->hnode);
+	hash_del(&avic->hnode);
 	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
 }
 
@@ -117,10 +123,9 @@ int avic_vm_init(struct kvm *kvm)
 {
 	unsigned long flags;
 	int err = -ENOMEM;
-	struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
-	struct kvm_svm *k2;
 	struct page *p_page;
 	struct page *l_page;
+	struct kvm_svm_avic *avic = &to_kvm_svm(kvm)->avic;
 	u32 vm_id;
 
 	if (!enable_apicv)
@@ -131,14 +136,14 @@ int avic_vm_init(struct kvm *kvm)
 	if (!p_page)
 		goto free_avic;
 
-	kvm_svm->avic_physical_id_table_page = p_page;
+	avic->physical_id_table_page = p_page;
 
 	/* Allocating logical APIC ID table (4KB) */
 	l_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 	if (!l_page)
 		goto free_avic;
 
-	kvm_svm->avic_logical_id_table_page = l_page;
+	avic->logical_id_table_page = l_page;
 
 	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
  again:
@@ -149,13 +154,15 @@ int avic_vm_init(struct kvm *kvm)
 	}
 	/* Is it still in use? Only possible if wrapped at least once */
 	if (next_vm_id_wrapped) {
-		hash_for_each_possible(svm_vm_data_hash, k2, hnode, vm_id) {
-			if (k2->avic_vm_id == vm_id)
+		struct kvm_svm_avic *avic2;
+
+		hash_for_each_possible(svm_vm_data_hash, avic2, hnode, vm_id) {
+			if (avic2->vm_id == vm_id)
 				goto again;
 		}
 	}
-	kvm_svm->avic_vm_id = vm_id;
-	hash_add(svm_vm_data_hash, &kvm_svm->hnode, kvm_svm->avic_vm_id);
+	avic->vm_id = vm_id;
+	hash_add(svm_vm_data_hash, &avic->hnode, avic->vm_id);
 	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
 
 	return 0;
@@ -169,8 +176,8 @@ void avic_init_vmcb(struct vcpu_svm *svm, struct vmcb *vmcb)
 {
 	struct kvm_svm *kvm_svm = to_kvm_svm(svm->vcpu.kvm);
 	phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
-	phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic_logical_id_table_page));
-	phys_addr_t ppa = __sme_set(page_to_phys(kvm_svm->avic_physical_id_table_page));
+	phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic.logical_id_table_page));
+	phys_addr_t ppa = __sme_set(page_to_phys(kvm_svm->avic.physical_id_table_page));
 
 	vmcb->control.avic_backing_page = bpa & AVIC_HPA_MASK;
 	vmcb->control.avic_logical_id = lpa & AVIC_HPA_MASK;
@@ -193,7 +200,7 @@ static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
 	if (index >= AVIC_MAX_PHYSICAL_ID_COUNT)
 		return NULL;
 
-	avic_physical_id_table = page_address(kvm_svm->avic_physical_id_table_page);
+	avic_physical_id_table = page_address(kvm_svm->avic.physical_id_table_page);
 
 	return &avic_physical_id_table[index];
 }
@@ -387,7 +394,7 @@ static u32 *avic_get_logical_id_entry(struct kvm_vcpu *vcpu, u32 ldr, bool flat)
 		index = (cluster << 2) + apic;
 	}
 
-	logical_apic_id_table = (u32 *) page_address(kvm_svm->avic_logical_id_table_page);
+	logical_apic_id_table = (u32 *) page_address(kvm_svm->avic.logical_id_table_page);
 
 	return &logical_apic_id_table[index];
 }
@@ -737,7 +744,7 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
 			/* Try to enable guest_mode in IRTE */
 			pi.base = __sme_set(page_to_phys(svm->avic_backing_page) &
 					    AVIC_HPA_MASK);
-			pi.ga_tag = AVIC_GATAG(to_kvm_svm(kvm)->avic_vm_id,
+			pi.ga_tag = AVIC_GATAG(to_kvm_svm(kvm)->avic.vm_id,
 						     svm->vcpu.vcpu_id);
 			pi.is_guest_mode = true;
 			pi.vcpu_data = &vcpu_info;
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index e246793cbeaeb..96390fa5e3917 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -88,15 +88,17 @@ struct kvm_sev_info {
 	atomic_t migration_in_progress;
 };
 
-struct kvm_svm {
-	struct kvm kvm;
 
-	/* Struct members for AVIC */
-	u32 avic_vm_id;
-	struct page *avic_logical_id_table_page;
-	struct page *avic_physical_id_table_page;
+struct kvm_svm_avic {
+	u32 vm_id;
+	struct page *logical_id_table_page;
+	struct page *physical_id_table_page;
 	struct hlist_node hnode;
+};
 
+struct kvm_svm {
+	struct kvm kvm;
+	struct kvm_svm_avic avic;
 	struct kvm_sev_info sev_info;
 };
 
-- 
2.26.3