[PATCH 17/60] kvm: Move VCPU locking to struct kvm_vcpu_common

[Jörg Rödel]

From: Joerg Roedel <joerg.roedel@xxxxxxx>

Fields in struct kvm_vcpu which are protected by these locks is going
to move to struct kvm_vcpu_common. So move the locks as well.

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 include/linux/kvm_host.h | 31 +++++++++++++++++--------------
 virt/kvm/kvm_main.c      |  3 ++-
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 611bba515ac0..c8085c23e18e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -330,6 +330,13 @@ struct kvm_vcpu_common {
 	/* Currently active VCPU */
 	struct kvm_vcpu *current_vcpu;
 
+	/* Locks */
+	int ____srcu_idx; /* Don't use this directly.  You've been warned. */
+#ifdef CONFIG_PROVE_RCU
+	int srcu_depth;
+#endif
+	struct mutex mutex;
+
 	/* Scheduling state */
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 	struct preempt_notifier preempt_notifier;
@@ -347,15 +354,11 @@ struct kvm_vcpu {
 	int cpu;
 	int vcpu_id; /* id given by userspace at creation */
 	int vcpu_idx; /* index into kvm->planes[]->vcpu_array */
-	int ____srcu_idx; /* Don't use this directly.  You've been warned. */
-#ifdef CONFIG_PROVE_RCU
-	int srcu_depth;
-#endif
+
 	int mode;
 	u64 requests;
 	unsigned long guest_debug;
 
-	struct mutex mutex;
 	struct kvm_run *run;
 
 #ifndef __KVM_HAVE_ARCH_WQP
@@ -1001,35 +1004,35 @@ static inline void kvm_vm_bugged(struct kvm *kvm)
 
 static inline void kvm_vcpu_lock(struct kvm_vcpu *vcpu)
 {
-	mutex_lock(&vcpu->mutex);
+	mutex_lock(&vcpu->common->mutex);
 }
 
 static inline void kvm_vcpu_unlock(struct kvm_vcpu *vcpu)
 {
-	mutex_unlock(&vcpu->mutex);
+	mutex_unlock(&vcpu->common->mutex);
 }
 
 static inline struct mutex *kvm_vcpu_mutex(struct kvm_vcpu *vcpu)
 {
-	return &vcpu->mutex;
+	return &vcpu->common->mutex;
 }
 
 static inline void kvm_vcpu_srcu_read_lock(struct kvm_vcpu *vcpu)
 {
 #ifdef CONFIG_PROVE_RCU
-	WARN_ONCE(vcpu->srcu_depth++,
-		  "KVM: Illegal vCPU srcu_idx LOCK, depth=%d", vcpu->srcu_depth - 1);
+	WARN_ONCE(vcpu->common->srcu_depth++,
+		  "KVM: Illegal vCPU srcu_idx LOCK, depth=%d", vcpu->common->srcu_depth - 1);
 #endif
-	vcpu->____srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+	vcpu->common->____srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 }
 
 static inline void kvm_vcpu_srcu_read_unlock(struct kvm_vcpu *vcpu)
 {
-	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->____srcu_idx);
+	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->common->____srcu_idx);
 
 #ifdef CONFIG_PROVE_RCU
-	WARN_ONCE(--vcpu->srcu_depth,
-		  "KVM: Illegal vCPU srcu_idx UNLOCK, depth=%d", vcpu->srcu_depth);
+	WARN_ONCE(--vcpu->common->srcu_depth,
+		  "KVM: Illegal vCPU srcu_idx UNLOCK, depth=%d", vcpu->common->srcu_depth);
 #endif
 }
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d6975a5c60b4..9accca10c249 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -466,6 +466,8 @@ static int kvm_vcpu_init_common(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned
 
 	common->vcpu_idx = atomic_read(&kvm->online_vcpus);
 
+	mutex_init(&common->mutex);
+
 	common->kvm = kvm;
 	common->current_vcpu = vcpu;
 
@@ -500,7 +502,6 @@ static void kvm_vcpu_finish_common(struct kvm_vcpu *vcpu)
 
 static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
-	mutex_init(&vcpu->mutex);
 	vcpu->cpu = -1;
 	vcpu->kvm = kvm;
 	vcpu->plane = kvm->planes[0];
-- 
2.53.0