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

[Yunhong Jiang]

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

Signed-off-by: Yunhong Jiang <yunhong.ji...@linux.intel.com>
---
 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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