[PATCH 5/5] KVM: Expose x86 kvm_arch_set_irq_inatomic()

[Yunhong Jiang <yunhong.jiang@xxxxxxxxxxxxxxx>]

The x86 support setting irq in atomic, expose it to vfio driver.

Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxxxxxxxx>
---
 arch/x86/kvm/Kconfig     |  1 +
 include/linux/kvm_host.h | 19 ++++++++++++++++---
 virt/kvm/Kconfig         |  3 +++
 virt/kvm/eventfd.c       |  9 ---------
 4 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 639a6e34500c..642e8b905c96 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -30,6 +30,7 @@ config KVM
 	select HAVE_KVM_IRQFD
 	select IRQ_BYPASS_MANAGER
 	select HAVE_KVM_IRQ_BYPASS
+	select KVM_SET_IRQ_INATOMIC
 	select HAVE_KVM_IRQ_ROUTING
 	select HAVE_KVM_EVENTFD
 	select KVM_APIC_ARCHITECTURE
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 590c46e672df..a6e237275928 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -852,9 +852,6 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
 		bool line_status);
 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
 		int irq_source_id, int level, bool line_status);
-int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
-			       struct kvm *kvm, int irq_source_id,
-			       int level, bool line_status);
 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
 void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
@@ -1207,4 +1204,20 @@ int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
 				  uint32_t guest_irq, bool set);
 #endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
 
+#ifndef CONFIG_KVM_SET_IRQ_INATOMIC
+int __attribute__((weak)) kvm_arch_set_irq_inatomic(
+				struct kvm_kernel_irq_routing_entry *irq,
+				struct kvm *kvm, int irq_source_id,
+				int level,
+				bool line_status)
+{
+	return -EWOULDBLOCK;
+}
+#else
+extern int kvm_arch_set_irq_inatomic(
+			struct kvm_kernel_irq_routing_entry *e,
+			struct kvm *kvm, int irq_source_id, int level,
+			bool line_status);
+#endif
+
 #endif
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 7a79b6853583..7c99dd4724a4 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -50,3 +50,6 @@ config KVM_COMPAT
 
 config HAVE_KVM_IRQ_BYPASS
        bool
+
+config KVM_SET_IRQ_INATOMIC
+	bool
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index b20a2d1bbf73..405c26742380 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -173,15 +173,6 @@ irqfd_deactivate(struct kvm_kernel_irqfd *irqfd)
 	queue_work(irqfd_cleanup_wq, &irqfd->shutdown);
 }
 
-int __attribute__((weak)) kvm_arch_set_irq_inatomic(
-				struct kvm_kernel_irq_routing_entry *irq,
-				struct kvm *kvm, int irq_source_id,
-				int level,
-				bool line_status)
-{
-	return -EWOULDBLOCK;
-}
-
 static int
 irqfd_wakeup_pollin(struct kvm_kernel_irqfd *irqfd)
 {
-- 
1.8.3.1

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