[v2,02/24] KVM: x86: new irqchip mode KVM_IRQCHIP_INIT_IN_PROGRESS
diff mbox

Message ID 20170323141357.12144-3-david@redhat.com
State New
Headers show

Commit Message

David Hildenbrand March 23, 2017, 2:13 p.m. UTC
Let's add a new mode and set it while we create the irqchip via
KVM_CREATE_IRQCHIP and KVM_CAP_SPLIT_IRQCHIP.

This mode will be used later to test if adding routes
(in kvm_set_routing_entry()) is already allowed.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/irq.h              | 2 +-
 arch/x86/kvm/x86.c              | 7 ++++++-
 3 files changed, 8 insertions(+), 2 deletions(-)

Patch
diff mbox

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 74ef58c..164e544 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -727,6 +727,7 @@  struct kvm_hv {
 
 enum kvm_irqchip_mode {
 	KVM_IRQCHIP_NONE,
+	KVM_IRQCHIP_INIT_IN_PROGRESS, /* temporarily set during creation */
 	KVM_IRQCHIP_KERNEL,       /* created with KVM_CREATE_IRQCHIP */
 	KVM_IRQCHIP_SPLIT,        /* created with KVM_CAP_SPLIT_IRQCHIP */
 };
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 40d5b2c..7fa2480 100644
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -103,7 +103,7 @@  static inline int irqchip_kernel(struct kvm *kvm)
 
 static inline int irqchip_in_kernel(struct kvm *kvm)
 {
-	bool ret = kvm->arch.irqchip_mode != KVM_IRQCHIP_NONE;
+	bool ret = kvm->arch.irqchip_mode > KVM_IRQCHIP_INIT_IN_PROGRESS;
 
 	/* Matches with wmb after initializing kvm->irq_routing. */
 	smp_rmb();
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1faf620..fa8cceb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3934,9 +3934,12 @@  static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
 			goto split_irqchip_unlock;
 		if (kvm->created_vcpus)
 			goto split_irqchip_unlock;
+		kvm->arch.irqchip_mode = KVM_IRQCHIP_INIT_IN_PROGRESS;
 		r = kvm_setup_empty_irq_routing(kvm);
-		if (r)
+		if (r) {
+			kvm->arch.irqchip_mode = KVM_IRQCHIP_NONE;
 			goto split_irqchip_unlock;
+		}
 		/* Pairs with irqchip_in_kernel. */
 		smp_wmb();
 		kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
@@ -4024,8 +4027,10 @@  long kvm_arch_vm_ioctl(struct file *filp,
 			goto create_irqchip_unlock;
 		}
 
+		kvm->arch.irqchip_mode = KVM_IRQCHIP_INIT_IN_PROGRESS;
 		r = kvm_setup_default_irq_routing(kvm);
 		if (r) {
+			kvm->arch.irqchip_mode = KVM_IRQCHIP_NONE;
 			mutex_lock(&kvm->slots_lock);
 			mutex_lock(&kvm->irq_lock);
 			kvm_ioapic_destroy(kvm);